CN114535284A - In-situ heat-enhanced chemical redox coupling repair method for composite organic polluted site - Google Patents
In-situ heat-enhanced chemical redox coupling repair method for composite organic polluted site Download PDFInfo
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- CN114535284A CN114535284A CN202210171994.8A CN202210171994A CN114535284A CN 114535284 A CN114535284 A CN 114535284A CN 202210171994 A CN202210171994 A CN 202210171994A CN 114535284 A CN114535284 A CN 114535284A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses an in-situ heat-enhanced chemical redox coupling restoration method for a composite organic polluted site, which comprises the following steps: s1, determining a pollution treatment boundary, and then setting a partition wall; determining the dosage of the remediation agent according to the type and content of the organic pollutants in the soil; finally, adjusting the pH value and the water content of the soil; s2, arranging a medicine injection well, a heating well and a monitoring well in the pollution treatment boundary; s3, introducing a repairing agent into the injection well, and introducing hot steam into the heating well; s4, monitoring the repairing effect of the composite organic pollution site by using monitoring equipment in a monitoring well; the invention has reasonable design, remarkable restoration effect of the composite organic pollution site and is suitable for popularization and use.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to an in-situ heat-enhanced chemical redox coupling remediation method for a composite organic contaminated site.
Background
An organically contaminated site refers to an area of space that is packed, stored, handled, disposed of, or otherwise loaded with organic contaminants, poses a hazard to human health and the environment, or is at potential risk. The carriers for pollutants in the polluted site comprise site soil, site underground water, site surface water, site environment air, site residual waste pollutants such as production equipment, buildings, structures, organisms and the like. And soil is as the main soil collection ground of pollutant, compares with atmospheric air and water, and soil is to the holding capacity of pollutant many big, and the pollutant that enters into in the soil generally has disguise, hysteresis quality, accumulation nature, leads to the restoration of soil to administer the degree of difficulty great, repair cycle length, with high costs. Moreover, different areas cause soil pollution, the contained pollutants have different components and types, and the remediation methods are different, so that the difficulty in remediation of soil organic pollution is increased.
The contaminated soil remediation techniques can be classified into physical remediation, chemical remediation and biological remediation according to the difference of the adopted method and principle. Wherein, the chemical repairing technology comprises a chemical leaching technology, a chemical reduction and reduction dechlorination repairing technology, a chemical oxidation repairing technology, a solvent leaching technology, a soil performance improvement repairing technology and the like. The physical repair is usually realized by transferring or fixing pollutants, so that the defect of incomplete repair is realized; while bioremediation usually requires a long time, chemical remediation technology has the advantages of short remediation time, complete degradation and the like, so that chemical remediation is increasingly applied to remediation of contaminated sites.
Disclosure of Invention
Aiming at the technical problems, the invention provides an in-situ heat-enhanced chemical redox coupling restoration method for a composite organic pollution site, which has the advantages of short restoration period and obvious effect.
The technical scheme of the invention is as follows: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 20-45 cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is 30-55 cm greater than the depth of the polluted soil;
s1-2, collecting 50-100 cm of pollution treatment boundary determined in the step S1-13The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil;
s1-3, adding dilute nitric acid with the volume concentration of 15-30% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 6-7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 25-40 wt%;
s2, laying equipment;
s2-1, arranging a plurality of injection wells with the interval of 8-10 m in a contaminated soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with heat dissipation grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly distributing a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are distributed at intervals with a heating well and a medicine injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; controlling the air pressure of the steam air heater to be 5-9 kPaThe air volume is 80-130 m3The air outlet temperature is 400-750 ℃;
s3-2, intermittently introducing the repairing agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 3-7 kPa, and calculating the injection quantity of the repairing agent according to the step S1-2; wherein the time interval of introducing the repairing agent is 3-5 h, and the introducing times are 2-6;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
Further, in step S1-2, the repairing agent comprises the following raw materials in parts by weight: 15-25 parts of activated iron, 5-9 parts of plant polysaccharide, 3-7 parts of polyvinyl alcohol and 20-45 parts of deionized water; wherein the activated iron is prepared by activating reduced iron powder with the particle size of 15-45 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed.
Further, in step S1-1, the ditching equipment comprises an equipment box, an operation frame, a fluted disc and a power motor; a cavity is arranged in the equipment box, and a movable roller is arranged at the lower end of the equipment box; the operating frame is movably sleeved with a connecting block, the operating frame is movably hinged inside the cavity through the connecting block, a push ring is arranged at the upper end of the operating frame, mounting plates are arranged at the lower end of the operating frame, the two mounting plates are respectively connected to the lower end of the operating frame through sliding columns, and the lower end of the operating frame is connected with a limiting plate for fixing the mounting plates through bolts; the two fluted discs are rotatably clamped on two opposite sides of the two mounting plates through rotating shafts respectively, the two rotating shafts respectively penetrate through the corresponding mounting plates and are provided with connecting gears, a plurality of spiral ground breaking plates are uniformly distributed on one opposite sides of the two fluted discs, and the spiral ground breaking plates on the same fluted disc are connected through a fixing ring; the power motor is arranged at the bottom end of the operation frame and positioned at the inner sides of the two mounting plates, output shafts are arranged at two ends of the power motor, shaft sleeves penetrating through the two mounting plates are slidably clamped on the two output shafts, driving gears are arranged on the two shaft sleeves, and the driving gears and the connecting gears in the same mounting plate are in transmission through chains; by the ditching equipment, the distance between the two fluted discs can be freely adjusted according to the width of the isolation groove, so that the construction accuracy of the isolation groove during excavation is improved; meanwhile, the two fluted discs are used for excavating the isolation grooves in the polluted soil at the same time, so that the disturbance on the organic polluted soil generated when the equipment runs can be effectively reduced, the pollutants in the organic polluted soil are kept in a stable state, and the subsequent treatment and restoration of the polluted soil are facilitated.
Further, in the step S2-1, after the heating well is laid, a polyethylene barrier layer with the width of 50-80 cm is laid on the heating well mouth in the circumferential direction; by laying the polyethylene barrier layer, the heat loss in the heating process of the polluted soil can be reduced, and secondary pollution caused by volatilization of organic pollutants can be avoided.
Further, in the step S4, a thermocouple temperature monitor is disposed in the monitoring well, so as to facilitate monitoring of the heating temperature of the organic contaminated soil, thereby facilitating adjustment of the heating temperature of the soil and improving the heat strengthening effect of the organic contaminated soil.
Further, the repairing agent also comprises 0.5-2 parts of a surfactant, wherein the surfactant is an anionic surfactant; by adding the anionic surfactant, the consumption of the repairing agent by pollutants in the organic polluted soil can be reduced, so that the utilization efficiency of the repairing agent is improved.
Further, after the step S1-3 is finished, spraying a soil conditioner to the surface of the organic contaminated soil area, wherein the soil conditioner is prepared by compounding lumbrokinase stock solution, inoculum solution, natural carborundum ore powder, ribonucleic acid concentrated solution, potassium dihydrogen phosphate and deionized water according to the volume ratio of 1:1:3:2:1:4, and the soil conditioner added into the organic contaminated soil according to the proportion can effectively improve the permeability of the organic contaminated soil, can improve the diffusion efficiency of a remediation agent in the contaminated soil, and thus improve the degradation efficiency of organic pollutants.
Further, in the step S3-2, the remediation agent is introduced into the contaminated soil in a gas-liquid mixing manner, the remediation agent is controlled to occupy 45-60% of the gas-liquid mixture by volume, and the remediation agent is introduced into the organic contaminated soil in a gas-liquid mixing manner, so that the diffusion of the remediation agent in the organic contaminated soil can be effectively promoted, and the remediation agent has strong degradation capability on the aggregated pollutants in the organic contaminated soil.
Further, in the step S2-2, a filter screen layer is wrapped on the medicine injection screen pipe, and the aperture of the mesh of the filter screen layer is smaller than that of the mesh on the medicine injection screen pipe; through setting up the filter screen layer, can effectively avoid polluting the granule and block up injection sieve pipe to improve the remediation efficiency of organic contaminated soil.
Further, in the step S2, the arrangement density of the injection wells, the heating wells and the monitoring wells is determined according to the concentration of organic matters in the soil, and the injection wells, the heating wells and the monitoring wells are arranged at intervals, and the intervals are controlled to be 3-5 m; by means of the well arrangement mode, well arrangement efficiency can be effectively improved, and meanwhile, the repair cost of the organic contaminated soil can be reduced.
The method for using the ditching equipment comprises the following steps: when the device is used, the power motor is connected with an external power supply, the positions of the two mounting plates on the sliding column are adjusted according to the excavation width of the isolation groove, and the mounting plates and the operation frame are fixed by using the limiting plates; starting a power motor, and enabling a worker to hold the push ring by hands to enable the two fluted discs to be in contact with the ground; the power motor is used for driving the two driving gears to rotate, so that the two fluted discs rotate, the spiral soil breaking plates on the fluted discs are used for digging up soil, and then the soil which is loosened is cleaned; in the rotation process of the fluted disc, the sliding distance of the operating frame on the connecting block is adjusted, and the ground depth of the fluted disc is adjusted; meanwhile, the equipment box is moved along with the tunneling of the fluted disc by utilizing the movable rollers.
Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable design, and the composite organic pollution site is repaired and treated by utilizing a heat-enhanced chemical oxidation-reduction coupling method; the steam hot air blower introduces hot air into the organic contaminated soil, so that the organic contaminated soil can be uniformly heated, and the removal of volatile organic compounds in the soil is facilitated; the heat strengthening is cooperated with chemical oxidation, so that the high-efficiency removal of complex-component organic pollutants in a composite organic pollution site is realized;
the method adopts an in-situ remediation mode to carry out remediation treatment on the composite organic polluted site, compared with the ex-situ normal-temperature desorption remediation technology, the method greatly avoids the problem of secondary pollution possibly generated by the links of soil excavation, transfer, transportation and the like, and the remediation method has the advantages of small engineering quantity, low cost and small site disturbance; meanwhile, in the soil remediation process, hot air is transported in the soil gaps to increase the oxygen content in the soil gaps and underground water, so that the proliferation of degradation bacteria in the soil of the composite organic pollution site can be obviously improved, and the degradation of hydrocarbon organic pollutants in the soil is promoted.
Drawings
FIG. 1 is a longitudinal section of the trenching apparatus of the present invention;
FIG. 2 is a left side view of the trenching apparatus of the present invention;
FIG. 3 is a structural schematic of a chainring of the present invention;
the device comprises an equipment box 1, a cavity 10, a movable roller 11, an operating frame 2, a connecting block 20, a pushing ring 21, a mounting plate 22, a sliding column 220, a limiting plate 221, a fluted disc 3, a rotating shaft 30, a connecting gear 300, a spiral ground breaking plate 31, a fixing ring 32, a power motor 4, a shaft sleeve 40 and a driving gear 41.
Detailed Description
Example 1: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 20cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is 30cm greater than the depth of the polluted soil;
s1-2, taking 50cm of pollutant within the pollution treatment boundary determined in the step S1-13The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 15 parts of activated iron, 5 parts of plant polysaccharide, 3 parts of polyvinyl alcohol and 20 parts of deionized water; wherein the activated iron is prepared by activating reduced iron powder with the particle size of 15-30 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed;
s1-3, adding dilute nitric acid with the volume concentration of 15% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 6, and then injecting water into the polluted soil to control the water content of the polluted soil to be 25 wt%;
s2, laying equipment;
s2-1, arranging a plurality of medicine injection wells with the interval of 8m in the polluted soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with heat dissipation grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating well and the injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam hot air blower is controlled to be 5kPa, and the wind quantity is controlled to be 80m3H, the air outlet temperature is 400 ℃;
s3-2, intermittently introducing the repairing agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 3kPa, and calculating the injection quantity of the repairing agent according to the step S1-2; wherein the introducing interval time of the repairing medicament is 3h, and the introducing times are 2 times;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
Example 2: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 35cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is 40cm greater than the depth of the polluted soil; the ditching equipment comprises an equipment box 1, an operation frame 2, a fluted disc 3 and a power motor 4; a cavity 10 is arranged in the equipment box 1, and a movable roller 11 is arranged at the lower end of the equipment box 1; the operating frame 2 is movably sleeved with a connecting block 20, the operating frame 2 is movably hinged inside the cavity 10 through the connecting block 20, the upper end of the operating frame 2 is provided with a pushing ring 21, the lower end of the operating frame 2 is provided with two mounting plates 22, the two mounting plates 22 are respectively connected to the lower end of the operating frame 2 through sliding columns 220, and the lower end of the operating frame 2 is connected with a limiting plate 221 for fixing the mounting plates 22 through bolts; two fluted discs 3 are arranged, the two fluted discs 3 are rotationally clamped on two opposite sides of the two mounting plates 22 through rotating shafts 30, the two rotating shafts 30 penetrate through the corresponding mounting plates 22 respectively and are provided with connecting gears 300, a plurality of spiral ground breaking plates 31 are uniformly distributed on one opposite sides of the two fluted discs 3, and the spiral ground breaking plates 31 on the same fluted disc 3 are connected through fixing rings 32; the power motor 4 is arranged at the bottom end of the operation frame 2 and is positioned at the inner sides of the two mounting plates 22, output shafts are arranged at two ends of the power motor 4, shaft sleeves 40 penetrating through the two mounting plates 22 are clamped on the two output shafts in a sliding mode, driving gears 41 are arranged on the two shaft sleeves 40, and the driving gears 41 and the connecting gears 300 in the same mounting plate 22 are in transmission through chains; by the ditching equipment, the distance between the two fluted discs 3 can be freely adjusted according to the width of the isolation groove, so that the construction accuracy of the isolation groove during excavation is improved; meanwhile, the two fluted discs 3 are used for excavating the isolation grooves in the polluted soil at the same time, so that the disturbance on the organic polluted soil generated by the operation of equipment can be effectively reduced, the pollutants in the organic polluted soil are kept in a stable state, and the subsequent treatment and restoration of the polluted soil are facilitated;
s1-2, taking 80cm of pollutant within the pollution treatment boundary determined in the step S1-13The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 20 parts of activated iron, 7 parts of plant polysaccharide, 5 parts of polyvinyl alcohol and 35 parts of deionized water; wherein the activated iron is activated by reduced iron powder with the particle size of 25-45 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed;
s1-3, adding dilute nitric acid with the volume concentration of 25% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 35 wt%;
s2, laying equipment;
s2-1, arranging a plurality of medicine injection wells with the spacing of 9m in the polluted soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with radiating grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating well and the injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam hot air blower is controlled to be 7kPa, and the wind quantity is controlled to be 110m3The air outlet temperature is 550 ℃;
s3-2, intermittently introducing the repairing agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 5kPa, and calculating the injection quantity of the repairing agent according to the step S1-2; wherein the introducing interval time of the repairing medicament is 4h, and the introducing times are 5 times;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
Example 3: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 45cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is greater than the depth of the polluted soil by 55 cm;
s1-2, contamination handling boundary determined at step S1-1Inner diameter of 100cm3The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 25 parts of activated iron, 9 parts of plant polysaccharide, 7 parts of polyvinyl alcohol and 45 parts of deionized water; wherein the activated iron is prepared by activating biological reduced iron powder with the particle size of 30-45 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed;
s1-3, adding dilute nitric acid with the volume concentration of 30% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 40 wt%;
s2, laying equipment;
s2-1, arranging a plurality of injection wells with the spacing of 10m in the polluted soil area; then, arranging a heating well between two adjacent medicine injection wells; after the heating well is laid, a polyethylene barrier layer with the width of 50cm is laid on the circumferential direction of the heating well mouth; the polyethylene barrier layer is laid, so that the heat loss in the heating process of the polluted soil can be reduced, and secondary pollution caused by volatilization of organic pollutants can be avoided;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; a filter screen layer is wrapped on the medicine injection screen pipe, and the aperture of the mesh of the filter screen layer is smaller than the aperture of the mesh on the medicine injection screen pipe by 0.5 mm; by arranging the filter screen layer, the blockage of the pesticide injection screen pipe by pollution particles can be effectively avoided, so that the remediation efficiency of the organic polluted soil is improved; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with heat dissipation grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating well and the injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam air heater is controlled to be 9kPa, and the wind quantity is controlled to be 130m3The air outlet temperature is 750 ℃;
s3-2, intermittently introducing the remediation agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 7kPa, and calculating the injection amount of the remediation agent according to the step S1-2; wherein the introducing interval time of the repairing medicament is 5h, and the introducing times are 6 times;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
Example 4: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 20cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is 30cm greater than the depth of the polluted soil;
s1-2, taking 50cm of air within the pollution treatment boundary determined in the step S1-13The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 15 parts of activated iron, 5 parts of plant polysaccharide,3 parts of polyvinyl alcohol, 20 parts of deionized water and 0.5 part of surfactant; wherein the activated iron is prepared by activating biological reduced iron powder with the particle size of 15-25 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed; the surfactant is octanol polyether-9 carboxylic acid anion surfactant; by adding the anionic surfactant, the consumption of the repairing agent by pollutants in the organic polluted soil can be reduced, so that the utilization efficiency of the repairing agent is improved;
s1-3, adding dilute nitric acid with the volume concentration of 15% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 6, and then injecting water into the polluted soil to control the water content of the polluted soil to be 25 wt%;
s2, laying equipment;
s2-1, arranging a plurality of medicine injection wells with the interval of 8m in the polluted soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection screen pipe in the chemical injection well, and filling quartz sand between the chemical injection screen pipe and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with heat dissipation grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating well and the injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam hot air blower is controlled to be 5kPa, and the wind quantity is controlled to be 80m3H, the air outlet temperature is 400 ℃;
s3-2, intermittently introducing the repairing agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 3kPa, and calculating the injection quantity of the repairing agent according to the step S1-2; wherein the introducing interval time of the repairing medicament is 3h, and the introducing times are 2 times;
s4, monitoring;
monitoring equipment and a thermocouple temperature monitor are arranged in the monitoring well, and the monitoring equipment is utilized to monitor the repairing effect of the composite organic pollution site in real time; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target; the thermocouple temperature monitor is arranged, so that the heating temperature of the organic contaminated soil can be monitored conveniently, the heating temperature of the soil can be adjusted, and the heat strengthening effect of the organic contaminated soil can be improved.
Example 5: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 45cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is greater than the depth of the polluted soil by 55 cm;
s1-2, taking 100cm within the contamination handling boundary determined at step S1-13The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 25 parts of activated iron, 9 parts of plant polysaccharide, 7 parts of polyvinyl alcohol and 45 parts of deionized water; wherein the activated iron is prepared by activating reduced iron powder with the particle size of 30-45 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed;
s1-3, adding dilute nitric acid with the volume concentration of 30% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 40 wt%; the soil conditioner is sprayed on the surface of an organic contaminated soil area, the soil conditioner is prepared by compounding lumbrokinase stock solution, seed solution, natural carborundum ore powder, ribonucleic acid concentrated solution, potassium dihydrogen phosphate and deionized water according to the volume ratio of 1:1:3:2:1:4, and the soil conditioner with the proportion is added into the organic contaminated soil, so that the permeability of the organic contaminated soil can be effectively improved, the diffusion efficiency of a remediation agent in the contaminated soil can be improved, and the degradation efficiency of organic pollutants is improved;
s2, laying equipment;
s2-1, arranging a plurality of medicine injection wells with the spacing of 9m in the polluted soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with radiating grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating well and the injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam air heater is controlled to be 9kPa, and the wind quantity is controlled to be 130m3The air outlet temperature is 680 ℃;
s3-2, intermittently introducing a repairing agent into the polluted soil through an injection sieve tube in a gas-liquid mixing mode by using high-pressure injection equipment, controlling the volume percentage of the repairing agent in the gas-liquid mixture to be 45%, introducing the repairing agent into the organic polluted soil in the gas-liquid mixing mode, effectively promoting the diffusion of the repairing agent in the organic polluted soil, and having strong degradation capability on pollutants aggregated in the organic polluted soil; controlling the pressure of the high-pressure injection equipment to be 7kPa, and calculating the injection quantity of the repairing medicament according to the step S1-2; wherein the introducing interval time of the repairing medicament is 5h, and the introducing times are 6 times;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
Example 6: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 20cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is 30cm greater than the depth of the polluted soil;
s1-2, taking 85cm of pollutant within the pollution treatment boundary determined at the step S1-13The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; the adding amount of the remediation agent is the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 20 parts of activated iron, 7 parts of plant polysaccharide, 6 parts of polyvinyl alcohol and 33 parts of deionized water; wherein the activated iron is prepared by activating reduced iron powder with the particle size of 30-45 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed;
s1-3, adding dilute nitric acid with the volume concentration of 26% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 35 wt%;
s2, laying equipment;
s2-1, arranging a plurality of injection wells with the distance of 10m in a polluted soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with heat dissipation grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating well and the injection well; and the spacing is controlled to be 3 m;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam hot-air blower is controlled to be 6kPa, and the wind quantity is controlled to be 112m3The air outlet temperature is 450 ℃;
s3-2, intermittently introducing the remediation agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 5kPa, and calculating the injection amount of the remediation agent according to the step S1-2; wherein the introducing interval time of the repairing medicament is 4h, and the introducing times are 5 times;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
Example 7: the in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site comprises the following steps:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 45cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; wherein the excavation depth of the isolation groove is greater than the depth of the polluted soil by 55 cm; the ditching equipment comprises an equipment box 1, an operation frame 2, a fluted disc 3 and a power motor 4; a cavity 10 is arranged in the equipment box 1, and a movable roller 11 is arranged at the lower end of the equipment box 1; the operating frame 2 is movably sleeved with a connecting block 20, the operating frame 2 is movably hinged inside the cavity 10 through the connecting block 20, the upper end of the operating frame 2 is provided with a pushing ring 21, the lower end of the operating frame 2 is provided with two mounting plates 22, the two mounting plates 22 are respectively connected to the lower end of the operating frame 2 through sliding columns 220, and the lower end of the operating frame 2 is connected with a limiting plate 221 for fixing the mounting plates 22 through bolts; two fluted discs 3 are arranged, the two fluted discs 3 are rotationally clamped on two opposite sides of the two mounting plates 22 through rotating shafts 30, the two rotating shafts 30 penetrate through the corresponding mounting plates 22 respectively and are provided with connecting gears 300, a plurality of spiral ground breaking plates 31 are uniformly distributed on one opposite sides of the two fluted discs 3, and the spiral ground breaking plates 31 on the same fluted disc 3 are connected through fixing rings 32; the power motor 4 is arranged at the bottom end of the operation frame 2 and is positioned at the inner sides of the two mounting plates 22, output shafts are arranged at two ends of the power motor 4, shaft sleeves 40 penetrating through the two mounting plates 22 are clamped on the two output shafts in a sliding mode, driving gears 41 are arranged on the two shaft sleeves 40, and the driving gears 41 and the connecting gears 300 in the same mounting plate 22 are in transmission through chains; by the ditching equipment, the distance between the two fluted discs 3 can be freely adjusted according to the width of the isolation groove, so that the construction accuracy of the isolation groove during excavation is improved; meanwhile, the two fluted discs 3 are used for excavating the isolation grooves in the polluted soil at the same time, so that the disturbance on the organic polluted soil generated by the operation of equipment can be effectively reduced, the pollutants in the organic polluted soil are kept in a stable state, and the subsequent treatment and restoration of the polluted soil are facilitated;
s1-2, in step S1-1 within a defined contamination handling boundary, take 100cm3The types and the contents of organic pollutants in the polluted soil are measured, and the adding amount of the repairing agent is calculated; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil; the repairing medicament comprises the following raw materials in parts by weight: 25 parts of activated iron, 9 parts of plant polysaccharide, 7 parts of polyvinyl alcohol, 45 parts of deionized water and 2 parts of surfactant; wherein the activated iron is prepared by activating reduced iron powder with the particle size of 15-25 nm; by adding the iron-based remediation agent into the polluted soil, hydrocarbon derivatives such as halohydrocarbon, nitro organic matters and the like which are difficult to oxidize in the composite organic polluted soil can be effectively removed; the surfactant is octanol polyether-9 carboxylic acid anion surfactant; by adding the anionic surfactant, the consumption of the repairing agent by pollutants in the organic polluted soil can be reduced, so that the utilization efficiency of the repairing agent is improved;
s1-3, adding dilute nitric acid with the volume concentration of 30% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 40 wt%; the soil conditioner is sprayed on the surface of an organic contaminated soil area, the soil conditioner is prepared by compounding lumbrokinase stock solution, seed solution, natural carborundum ore powder, ribonucleic acid concentrated solution, potassium dihydrogen phosphate and deionized water according to the volume ratio of 1:1:3:2:1:4, and the soil conditioner with the proportion is added into the organic contaminated soil, so that the permeability of the organic contaminated soil can be effectively improved, the diffusion efficiency of a remediation agent in the contaminated soil can be improved, and the degradation efficiency of organic pollutants is improved;
s2, laying equipment;
s2-1, arranging a plurality of medicine injection wells with the interval of 8m in the polluted soil area; then, arranging a heating well between two adjacent medicine injection wells; after the heating well is laid, a polyethylene barrier layer with the width of 80cm is laid on the circumferential direction of the heating well mouth; the polyethylene barrier layer is laid, so that the heat loss in the heating process of the polluted soil can be reduced, and secondary pollution caused by volatilization of organic pollutants can be avoided;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; a filter screen layer is wrapped on the medicine injection screen pipe, and the aperture of the mesh of the filter screen layer is smaller than the aperture of the mesh on the medicine injection screen pipe by 0.6 mm; by arranging the filter screen layer, the blockage of the pesticide injection screen pipe by pollution particles can be effectively avoided, so that the remediation efficiency of the organic polluted soil is improved; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with heat dissipation grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, conducting the steam hot air blower with a heating pipe through a pipeline, and conducting the medicine storage box with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly arranging a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are arranged at intervals with the heating wells and the injection wells, the arrangement density is determined according to the concentration of organic matters in the soil, and the distances among the injection wells, the heating wells and the monitoring wells are controlled to be 5 m; by the well arrangement mode, the well arrangement efficiency can be effectively improved, and meanwhile, the repair cost of the organic polluted soil can be reduced;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; the wind pressure of the steam air heater is controlled to be 9kPa, and the wind quantity is controlled to be 130m3The air outlet temperature is 750 ℃;
s3-2, intermittently introducing a repairing medicament into the polluted soil in a gas-liquid mixing mode through a medicament injection sieve tube by using high-pressure injection equipment, controlling the volume percentage of the repairing medicament in the gas-liquid mixture to be 60%, controlling the pressure of the high-pressure injection equipment to be 7kPa, and calculating the injection quantity of the repairing medicament according to the step S1-2; wherein the introducing interval time of the repairing medicament is 5h, and the introducing times are 6 times; the remediation agent is introduced into the organic contaminated soil in a gas-liquid mixing mode, so that the diffusion of the remediation agent in the organic contaminated soil can be effectively promoted, and the remediation agent has strong degradation capability on pollutants aggregated in the organic contaminated soil;
s4, monitoring;
arranging monitoring equipment and a thermocouple temperature monitor in the monitoring well, and monitoring the repairing effect of the composite organic pollution site in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target; by arranging the thermocouple temperature monitor, the heating temperature of the organic contaminated soil can be monitored conveniently, so that the heating temperature of the soil can be adjusted, and the heat strengthening effect of the organic contaminated soil can be improved.
Test example: the raw material stacking field of a certain chemical plant in south China is used as a test field, and the area of the field is 1500m2Dividing the polluted site into 24 sample plots at random, and then dividing the 24 test sample plots into 8 groups at random; wherein the first 7 groups of test plots were respectively repaired by the methods of examples 1-7 of the present invention, and the 8 th group was repaired by the prior art method as a comparative example; after the test, the degradation rate of the organic pollutants in each test sample was measured, and the measurement results are shown in table 1:
table 1 effect of the method of each example on the degradation rate of organic pollutants in a complex organically polluted site;
as can be seen from the data in table 1, in example 2, compared with example 1, hydrocarbon derivatives such as halogenated hydrocarbons and nitro-organic substances which are difficult to oxidize in the composite organic contaminated soil can be effectively removed by adding the iron-based remediation agent to the contaminated soil; by utilizing the ditching equipment disclosed by the invention, the distance between the two fluted discs can be freely adjusted according to the width of the isolation groove, so that the construction accuracy during the excavation of the isolation groove is improved; meanwhile, the two fluted discs are used for excavating the isolation grooves in the polluted soil at the same time, so that the disturbance on the organic polluted soil generated by the operation of equipment can be effectively reduced, the pollutants in the organic polluted soil are kept in a stable state, and the subsequent treatment and restoration of the polluted soil are facilitated; compared with the embodiment 1, the embodiment 3 has the advantages that the polyethylene barrier layer is laid on the heating wellhead in the circumferential direction, so that the heat loss in the heating process of the polluted soil can be reduced, and the secondary pollution caused by volatilization of organic pollutants can be avoided; by wrapping the filter screen layer on the pesticide injection screen pipe, pollution particles can be effectively prevented from blocking the pesticide injection screen pipe, so that the remediation efficiency of the organic polluted soil is improved; compared with the embodiment 1, the embodiment 4 has the advantages that the thermocouple temperature monitor is arranged in the monitoring well, so that the heating temperature of the organic contaminated soil can be monitored conveniently, the heating temperature of the soil can be adjusted conveniently, the heat strengthening effect of the organic contaminated soil can be improved, and the degradation efficiency of organic pollutants in the soil can be effectively promoted; by adding octanol polyether-9 carboxylic acid anionic surfactant into the repairing agent, the consumption of pollutants in the organic polluted soil to the repairing agent can be reduced, so that the utilization efficiency of the repairing agent is improved; compared with the embodiment 1, the embodiment 5 has the advantages that the soil conditioner with the proportion is added into the organic contaminated soil, so that the permeability of the organic contaminated soil can be effectively improved, the diffusion efficiency of the remediation agent in the contaminated soil can be improved, and the degradation efficiency of organic pollutants can be improved; the remediation agent is introduced into the organic contaminated soil in a gas form, so that the diffusion of the remediation agent in the organic contaminated soil can be effectively promoted, and the remediation agent has strong degradation capability on the pollutants aggregated in the organic contaminated soil; compared with the embodiment 1, the embodiment 6 has the advantages that the well arrangement mode can effectively improve the well arrangement efficiency, is beneficial to improving the repair efficiency of the organic polluted site, and can reduce the repair cost of the organic polluted soil; compared with the embodiments 1-6, the embodiment 7 integrates and optimizes the parameter conditions, so that the degradation rate of each organic pollutant in the composite organic pollution site is the highest.
Claims (10)
1. The in-situ heat-enhanced chemical oxidation-reduction coupling restoration method for the composite organic polluted site is characterized by comprising the following steps of:
s1, preprocessing a polluted site;
s1-1, determining a pollution treatment boundary and a polluted soil depth of a polluted site, and performing leveling compaction treatment; then, excavating an isolation groove with the width of 20-45 cm at the pollution treatment boundary by using ditching equipment, and arranging an isolation retaining wall in the isolation groove; the excavation depth of the isolation groove is 30-55 cm greater than the depth of the polluted soil;
s1-2, collecting 50-100 cm of pollution treatment boundary determined in the step S1-13Determining the types and the contents of organic pollutants in the polluted soil, and calculating the adding amount of the remediation agent; wherein, the adding amount of the remediation agent is equal to the volume of the polluted soil multiplied by the amount of the remediation agent per unit volume of the polluted soil;
s1-3, adding dilute nitric acid with the volume concentration of 15-30% into the soil in the pollution treatment boundary determined in the step S1-1, adjusting the pH of the polluted soil to 6-7, and then injecting water into the polluted soil to control the water content of the polluted soil to be 25-40 wt%;
s2, laying equipment;
s2-1, arranging a plurality of medicine injection wells with the spacing of 8-10 m in a polluted soil area; then, arranging a heating well between two adjacent medicine injection wells;
s2-2, arranging a chemical injection sieve tube in the chemical injection well, and filling quartz sand between the chemical injection sieve tube and the inner wall of the chemical injection well; then, arranging heating pipes in the heating well, wherein the pipe walls of the heating pipes are provided with radiating grooves;
s2-3, arranging a steam hot air blower and a medicine storage box outside the pollution treatment boundary, wherein the steam hot air blower is communicated with a heating pipe through a pipeline, and the medicine storage box is communicated with a medicine injection sieve pipe; flow valves are arranged between the steam hot air blower and the heating pipe and between the medicine storage box and the medicine injection sieve pipe;
s2-4, uniformly distributing a plurality of monitoring wells in the polluted soil area, wherein the monitoring wells are distributed at intervals with a heating well and a medicine injection well;
s3, repairing and treating;
s3-1, continuously introducing hot air into the polluted soil through a heating pipe by using a steam hot air blower; control steam air heater wind pressure5 to 9kPa, and an air volume of 80 to 130m3The air outlet temperature is 400-750 ℃;
s3-2, intermittently introducing the repairing agent into the polluted soil through a medicine injection sieve tube by using high-pressure injection equipment, controlling the pressure of the high-pressure injection equipment to be 3-7 kPa, and calculating the injection quantity of the repairing agent according to the step S1-2; wherein the time interval of introducing the repairing agent is 3-5 h, and the introducing times are 2-6;
s4, monitoring;
monitoring equipment is arranged in the monitoring well, and the repairing effect of the composite organic pollution site is monitored in real time by using the monitoring equipment; if the remediation effect of the organic contaminated site reaches a preset target, completing remediation; and if the remediation effect of the organic pollution site does not reach the preset target, repeating the step S3 until the remediation effect of the organic pollution site reaches the preset target.
2. The in-situ heat-strengthening chemical oxidation-reduction coupling restoration method for the composite organic pollution site according to claim 1, wherein in the step S1-1, the ditching equipment comprises an equipment box (1), an operating frame (2), a fluted disc (3) and a power motor (4); a cavity (10) is arranged in the equipment box (1), and a movable roller (11) is arranged at the lower end of the equipment box (1); the operating frame (2) is movably sleeved with a connecting block (20), the operating frame (2) is movably hinged inside the cavity (10) through the connecting block (20), a pushing ring (21) is arranged at the upper end of the operating frame (2), mounting plates (22) are arranged at the lower end of the operating frame (2), the two mounting plates (22) are respectively connected to the lower end of the operating frame (2) through sliding columns (220), and the lower end of the operating frame (2) is connected with a limiting plate (221) for fixing the mounting plates (22) through bolts; the two fluted discs (3) are rotatably clamped at two opposite sides of the two mounting plates (22) through rotating shafts (30), the two rotating shafts (30) penetrate through the corresponding mounting plates (22) respectively and are provided with connecting gears (300), a plurality of spiral soil breaking plates (31) are uniformly distributed at one opposite side of the two fluted discs (3), and the spiral soil breaking plates (31) on the same fluted disc (3) are connected through fixing rings (32); power motor (4) set up in handling frame (2) bottom, and are located the inboard of two mounting panels (22), and the both ends of power motor (4) all are provided with the output shaft, two equal slip joint has axle sleeve (40) of running through two mounting panels (22) on the output shaft, two all be provided with drive gear (41) on axle sleeve (40), pass through chain drive between drive gear (41) and connecting gear (300) of same mounting panel (22) inside.
3. The in-situ heat-strengthening chemical redox coupling restoration method for the composite organic contaminated site according to claim 1, wherein in the step S2-1, after the heating well is laid, a polyethylene barrier layer with the width of 50-80 cm is laid on the circumferential direction of the heating well mouth.
4. The in-situ heat-enhanced chemical redox coupling remediation method of claim 1, wherein in step S4, a thermocouple temperature monitor is deployed in the monitoring well.
5. The in-situ heat-enhanced chemical redox coupling restoration method for the composite organic contaminated site according to claim 1, wherein in the step S1-2, the restoration agent comprises the following raw materials in parts by weight: 15-25 parts of activated iron, 5-9 parts of plant polysaccharide, 3-7 parts of polyvinyl alcohol and 20-45 parts of deionized water; wherein the activated iron is prepared by activating reduced iron powder with the particle size of 15-45 nm.
6. The in-situ heat-enhanced chemical redox coupling restoration method for the composite organic contaminated site according to claim 5, wherein the restoration agent further comprises 0.5-2 parts of a surfactant, and the surfactant is an anionic surfactant.
7. The in-situ heat-enhanced chemical redox coupling remediation method for the composite organic contaminated site as claimed in claim 1, wherein after the step S1-3 is completed, a soil conditioner is sprayed on the surface of the organic contaminated soil area, and the soil conditioner is prepared by compounding lumbrokinase stock solution, inoculum solution, natural carborundum ore powder, ribonucleic acid concentrated solution, potassium dihydrogen phosphate and deionized water according to a volume ratio of 1:1:3:2:1: 4.
8. The in-situ heat-enhanced chemical redox coupling remediation method for the composite organic contaminated site as claimed in claim 1, wherein in step S3-2, the remediation agent is introduced into the contaminated soil in a gas-liquid mixing manner, and the remediation agent is controlled to occupy 45-60% of the gas-liquid mixture by volume percentage.
9. The in-situ heat-enhanced chemical redox coupling restoration method for the composite organic contaminated site according to claim 1, wherein in step S2-2, a screen layer is wrapped on the drug injection screen pipe, and the mesh diameter of the screen layer is smaller than that of the screen hole on the drug injection screen pipe.
10. The in-situ heat-enhanced chemical redox coupling remediation method for the composite organic contaminated site as claimed in claim 1, wherein in step S4, a temperature sensor is deployed in the monitoring well.
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