CN103170497B - Light oil polluted unsaturated zone soil in-situ remediation apparatus and method thereof - Google Patents
Light oil polluted unsaturated zone soil in-situ remediation apparatus and method thereof Download PDFInfo
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Abstract
The invention relates to a light oil polluted unsaturated zone soil in-situ remediation apparatus and a method thereof. The apparatus comprises an underground well group system, a pipeline system and a ground processing system. The underground well group system comprises an extraction well, an injection well and a ventilation monitoring well. The ground processing system comprises: an oil gas extracting and processing module which comprises a vacuum pump, an oil-gas separation tank and an oil gas adsorption tank, wherein the inlet of the oil-gas separation tank is connected with the extraction well, the outlet of the oil-gas separation tank is connected with the inlet of the oil gas adsorption tank, and the outlet of the oil gas adsorption tank is communicated with the atmosphere; a microbial enhanced remediation module which comprises a microbe and nutrient solution preparation tank, wherein a first injection solution is contained in the microbe and nutrient solution preparation tank, the microbe and nutrient solution preparation tank is connected with the inlet of a first injection metering pump, and the outlet of the first injection metering pump is connected with the injection well; and a chemical oxidation remediation module which comprises a chemical oxidant preparation tank, wherein a second injection solution is contained in the chemical oxidant preparation tank, the chemical oxidant preparation tank is connected with the inlet of the second injection metering pump, and the outlet of the second injection metering pump is connected with the injection well.
Description
Technical field
The present invention relates to field of environment protection; be particularly related to in-situ repairing device and method that a kind of light oil for gas station pollutes unsaturation band soil, it combines the function such as " soil vapor extraction ", " microbial augmentation degraded " and " chemical oxidation degraded ".
Background technology
Soil petroleum pollution often has that pollutant kind is many, incubation period is long, diffusion area is wide, harm is large, underground structure is complicated, difficulty of governance is large, rehabilitation cost high.If can not soil pollution be control effectively now, may further worsen in the future, threaten ecological environment and the mankind's health.Exploitation oil-polluted soils field repairing method and equipment, become present stage environmental protection work in the urgent need to.
Have statistical analysis to show, the leakage of buried tank (USTs) is the main reason that causes current Urban Soil Pollution.According to U.S. EPA calendar year 2001 statistics, the whole America gas station has 35% in seepage, nearly 420,000 of the buried tank of confirmation seepage, and almost all there is Seepage in the gas station building up in the past for 1970.China Service Station is mainly sold the light-end products taking gasoline, diesel oil as representative, once sunken tank generation Seepage can form rapidly soil pollution.If level of ground water is more shallow, can pollute in a short time underground water (saturated zone); If level of ground water is darker, light oil can in unsaturation band soil, exist for a long time and by long-term diffusion mobility behavior aggravate pollute.
The level of ground water of region, most of China gas station is darker, and it is most probable that the light oil of unsaturation band soil pollutes, be also the most incident pollution type.The composition of light-end products is low-molecular-weight arene, olefines, alkanes, alkyl ether and a small amount of colloid class in mainly comprising,, be trapped in soil porous media environment mainly with ADSORPTION STATE or gaseous form taking volatile organic matter (VOCs) and semi-volatile organic matter (SVOCs) as main in nature.
The environment and health risk of bringing for the soil petroleum pollution case of being on the increase, corresponding recovery technique is improved and innovates in constantly studying and putting into practice.Restorative procedure is divided and is mainly contained biology and physical chemistry method from function, and materialization restorative procedure comprises gaseous phase of soil suction, thermal desorption, soil cleaning, Soil leaching, chemical oxidation etc.; Biological renovation method comprises biological compost, biological mud, biological ventilation, the biological expedient of tillage, phytoremediation etc.Whether shift out processing according to soil, can be divided into again original position and dystopy method.Consider the problems such as rehabilitation cost, on-the-spot disturbance, pollution transportation and subsequent treatment, based technique for in-situ remediation is more suitable in practical application.
In every based technique for in-situ remediation of oil-polluted soils: soil vapor extraction is by strengthening the directed flow of air in unsaturated zone extracting gas phase, the Vapor Entrainment VOCs that makes to flow migrates to ground installation and processes.Its advantage is economical and effective, but not good to the suction effect of SVOCs, and longer repairing efficiency also causes cost higher.Biological ventilation by improving original position to microbial degradation ability to Polluted area air supply or O2, and the VOCs that makes to enter in atmosphere minimizes; Also can add nutriment to stimulate the growth metabolism of indigenous microorganism to Polluted area simultaneously.The reparation that biological ventilation is polluted heavier petroleum hydrocarbon product (as diesel oil) is more thorough, but biodegradation period that need to be longer.Conventional " water drive ", " poly-driving " principle of Soil leaching and oil field secondary oil recovery is similar, and injector well makes the leacheate soil pollution district that flows through, and petroleum pollution, under driving force effect, is leached the region that can be extracted out by underground water well.Its advantage is that repairing efficiency is short, repairs more thoroughly, but floor treatment technique is complicated with device, easily causes petroleum pollution to shift to saturated zone.
Soilillatge excavates oil-polluted soils, stir, spread out, and by increasing, soil O2 supplies with or interpolation nutrients increases microbial degradation activity, is more suitable in thin solum and compared with the long-term repair of the pollution of heavy oils.Chemical oxidation is injected into oxidant in soil, and pollutant is degraded by chemical reaction; Compared with other restorative procedures, chemical oxidation petroleum hydrocarbon contaminant capable of being fast degraded, if the reaction time is enough, can be CO2 and H2O by pollutant exhaustive oxidation, but also has the too high shortcoming of rehabilitation cost, for the more economical and effective of degraded of low concentration pollutant.Phytoremediation is to utilize the mechanism such as the absorption of plant and rhizosphere circle microorganism system thereof, volatilization, conversion, degraded to remove pollutant in soil environment; Rehabilitation cost is low, but the cycle is long, is subject to seasonal effect, is only applicable to topsoil reparation.
Every kind of soil pollution restorative procedure has its applicability, no matter any restorative procedure, due to the difference of soil property and pollution sources, single soil pollution restorative procedure is all difficult to the object of the removal all contaminants that reaches quick, efficient, economic, the general mode that adopts several different methods to combine of current recovery technique and equipment.Patent of invention CN102228900A discloses a kind of original position comprehensive repair system and method for oil-polluted soils, mainly adopts two-phase vacuum draw and stimulates the underground environment (be mainly saturated zone soil) of the means of repairing to free phases severe contamination to repair in conjunction with microorganism; Comprise oil phase, water, gas phase owing to extracting material out, cause floor treatment complex process.Equipment investment cost is large, and operating cost is high, does not determine the explosive-proof grade of equipment; And be not suitable for gas station use.Patent of invention CN102580993A discloses a kind of organic polluted soil based technique for in-situ remediation, the main auxiliary soil vapor extraction technology of Steam Heating that adopts is repaired organic polluted soil, is mainly made up of steam generation and injected system, soil vapor extraction system, ground waste gas Waste Water Treatment; The problems such as have equally apparatus and process system complex, equipment investment cost is large, and operation energy consumption is large; Tail gas adopts the processing of catalytic combustion mode, is not more suitable for the on-the-spot use in gas station.
In introducing mode, above-mentioned technology contents is incorporated in to the application.
Summary of the invention
The object of the invention is, provide a kind of light oil to pollute the in-situ repairing device of unsaturation band soil, it is by the suction to VOCs in soil and SVOCs, microbial augmentation degraded degrades to reach with chemical oxidation the object that light oil is removed fast, reduces the gas station that causes due to soil pollution and the environmental risk of near zone thereof.
Another object of the present invention is, the in-situ remediation method that provides a kind of light oil to pollute unsaturation band soil, and the unsaturation band soil that it pollutes for light oil, and combine the functions such as soil vapor extraction, microbial augmentation degraded and chemical oxidation degraded.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
Light oil pollutes an in-situ repairing device for unsaturation band soil, and described device comprises: underground wen system, and it comprises extraction well, injector well and ventilation monitoring well, and described extraction well has extracting well head, and described injector well has injection well head; Pipe-line system, it comprises extraction tube group, transportation pipe, the first imbibition pipeline, the first injection pipeline, the second imbibition pipeline and the second injection pipeline; Ground Processing System, it comprises: oil gas extracting and processing module, it includes vavuum pump, catch pot and oil gas adsorption tanks, the entrance of described catch pot is connected with described extracting well head by extraction tube group, the outlet of described catch pot is connected with the entrance of oil gas adsorption tanks by transportation pipe, on described transportation pipe, be connected with vavuum pump, the outlet of described oil gas adsorption tanks communicates with atmosphere; Microbial augmentation is repaired module, it comprises microorganism and nutrient solution tank, in described microorganism and nutrient solution tank, be equiped with the first injection liquid, described microorganism is connected with the entrance of the first injection measurement pump by the first imbibition pipeline with nutrient solution tank, described the first injection measurement delivery side of pump is connected with described injection well head by the first injection pipeline, so that the first injection liquid is injected to unsaturation band soil, in unsaturation band soil after suction residual SVOCs carry out microbial augmentation degraded; Chemical oxidation is repaired module, it comprises chemical oxidizing agent batch tank, in described chemical oxidizing agent batch tank, be equiped with the second injection liquid, described chemical oxidizing agent batch tank is connected with the entrance of described the second injection measurement pump by the second imbibition pipeline, described the second injection measurement delivery side of pump is connected with described injection well head by the second injection pipeline, so that the second injection liquid is injected to unsaturation band soil, carry out oxidative degradation to residual after microbial augmentation degraded in unsaturation band soil compared with heavy contaminant.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, each pipeline in described extraction tube group, transportation pipe, the first imbibition pipeline, the first injection pipeline, the second imbibition pipeline and the second injection pipeline is respectively rubber hose, in described rubber hose, have liner, described liner is steel-wire carcass.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, described the first injection liquid is oil degradation bacteria and nutritive salt mixed liquor, the composition quality percentage of described oil degradation bacteria and nutritive salt mixed liquor is: urea 2.1-3.0%, potassium dihydrogen phosphate 0.7-1.0%, metabolism matrix alpha-lactose 0.3-0.5% altogether, the oil degradation bacteria liquid 1.0-1.5% of biosurfactant production, all the other are fresh water.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, and described the second injection liquid is oxidizing agent solution, and described oxidizing agent solution composition quality percentage is: potassium peroxydisulfate 3-5%, or the hydrogen peroxide 5-10% of 30% concentration, all the other are fresh water.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, described microbial augmentation is repaired module and is further comprised the first agitator, first liquid filter, the first control valve and the first fire-proof motor, described the first fire-proof motor is electrically connected on the upper end of the first agitator, described the first agitator is connected on described microorganism and nutrient solution tank, and the lower end of the first agitator is positioned at described microorganism and nutrient solution tank, so that described the first injection liquid is stirred, the upper end of described the first agitator is positioned at the outside of described microorganism and nutrient solution tank, on described the first imbibition pipeline, connect successively described the first control valve and first liquid filter.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, described chemical oxidation is repaired module and is further comprised the second agitator, second liquid filter, the second control valve and the second fire-proof motor, described the second fire-proof motor is electrically connected on the upper end of the second agitator, described the second agitator is connected on described chemical oxidizing agent batch tank, and the lower end of the second agitator is positioned at described chemical oxidizing agent batch tank, so that the second injection liquid is stirred, the upper end of described the second agitator is positioned at the outside of described chemical oxidizing agent batch tank, on described the second imbibition pipeline, connect successively described the second control valve and second liquid filter.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, described extraction tube group comprises horizontal extracting house steward, vertically extracting house steward, multiple horizontal extracting arms, multiple vertical extracting arms, one end of described horizontal extracting house steward connects the entrance of described oil gas adsorption tanks, horizontal extracting house steward's other end vertical connecting extracting house steward's upper end, described vertical extracting house steward's lower end connects the outlet of described catch pot, one end of described each horizontal extracting arm connects respectively each vertical extracting arm accordingly, the other end of each horizontal extracting arm connects described extracting well head, the other end of described each vertical extracting arm connects described horizontal extracting house steward, described horizontal extracting house steward or vertically extracting house steward are provided with described vavuum pump, carry and take out house steward's pneumatic filter, extracting house steward control valve and extracting house steward emptying valve, on each horizontal extracting arm or vertically extracting arm, be connected with respectively extracting arm control valve and flowmeter for pipe is propped up in extracting, described transportation pipe comprises transportation pipe, and described transportation pipe is provided with transportation pipe control valve, transportation pipe flowmeter and the emptying valve of transportation pipe, after described transportation pipe flowmeter is arranged on described vavuum pump, the outlet of described oil gas adsorption tanks connects purified gas delivery pipe.
Light oil as above pollutes the in-situ repairing device of unsaturation band soil, and the bottom of described catch pot and oil gas adsorption tanks is respectively equipped with sewage draining valve.
A kind of light oil pollutes the in-situ remediation method of unsaturation band soil, described method comprises step: A, soil pollution scene, gas station is explored and sampling analysis, arrange quantity, distribution and the degree of depth of extraction well, injector well and ventilation monitoring well according to soil property and pollutant distribution situation; The operation of B, oil gas extracting and processing module: vavuum pump produces negative pressure after starting in each extraction well, near VOCs, SVOCs extraction well in soil and a small amount of moisture and Soil fine particles enter described extraction tube group through described extracting well head; Enter described catch pot via described extraction tube group and separate moisture and Soil fine particles, transfer malleation to after sucking described vavuum pump, then enter after described oil gas adsorption tanks purify and enter atmospheric environment through described transportation pipe; C, microbial augmentation are repaired the operation of module: the first injection liquid is prepared in described microorganism and compounding tank, the first injection liquid injects unsaturation band soil by described injection well head and described injector well again after described the first injection measurement pump pressurization, carries out microbial augmentation degraded to aspirating rear residual SVOCs; D, chemical oxidation are repaired the operation of module: the second injection liquid is prepared in chemical oxidizing agent preparing tank, after described the second injection measurement pump pressurization, inject unsaturation band soil by described injection well head and described injector well again, carry out oxidative degradation to microbial augmentation degraded is residual afterwards compared with heavy contaminant.
In-situ remediation method as above, when the described microbial augmentation in described step C is repaired module operation, described oil gas extracting and processing module be operation simultaneously also, thinks that underground oxygen supply promotes microbial degradation; When described chemical oxidation in described step D is repaired module operation, described oil gas extracting and processing module be operation simultaneously also, thinks the degraded of underground oxygen supply accelerating oxidation.
The features and advantages of the invention are:
1, the unsaturation band soil polluting for light oil, its in-situ remediation method and device have advantages of reduced investment, rehabilitation expense is low, repairing efficiency is short, repair rapidly and efficiently, technological process is succinct.
2, it can realize the function of removing more thoroughly in unsaturation band soil taking gasoline (VOCs is as main), diesel oil (SVOCs is as main) pollutant.Utilize soil vapor extraction, remove fast the gaseous contaminant in soil, ADSORPTION STATE pollutant also can transfer gaseous state to and be sucked removing under negative pressure.Residual ADSORPTION STATE pollutant can be gaseous contaminant and be sucked again removal by microbial augmentation Degradation and Transformation.Residual heavier contaminant component can be degraded to VOCs or mineralising by chemical oxidation, with complete to light oil contaminated soil fast, thoroughly repair.
But 3, it can be with the satisfied EM equipment module of limited function, the most succinct effectively process combination, repair mode the most fast and thoroughly, realizes the optimized reparation target of technical and economic performance.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the master of the Ground Processing System of the in-situ repairing device of light oil pollution unsaturation band soil of the present invention looks schematic diagram;
Fig. 2 is the schematic top plan view that light oil of the present invention pollutes the Ground Processing System of the in-situ repairing device of unsaturation band soil;
Fig. 3 is that schematic diagram is looked on the right side of the W-W line of Fig. 1;
Fig. 4 is that the master of the F-F line of Fig. 2 looks schematic diagram;
Fig. 5 is the schematic diagram that light oil of the present invention pollutes the suction well decomposing state of the in-situ repairing device of unsaturation band soil;
Fig. 6 is the schematic diagram that light oil of the present invention pollutes the suction well assembled state of the in-situ repairing device of unsaturation band soil;
Fig. 7 is the schematic diagram that light oil of the present invention pollutes the injector well decomposing state of the in-situ repairing device of unsaturation band soil;
Fig. 8 is the schematic diagram that light oil of the present invention pollutes the injector well assembled state of the in-situ repairing device of unsaturation band soil.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figures 1 to 4, the embodiment of the present invention has proposed a kind of in-situ repairing device of light oil pollution unsaturation band soil, and it comprises underground wen system, pipe-line system and Ground Processing System.Described underground wen system comprises extraction well 17, injector well 18 and ventilation monitoring well, and described extraction well 17 has extracting well head, and described injector well 18 has injection well head.Described pipe-line system comprises extraction tube group 1, transportation pipe 2a, the first imbibition pipeline 3, the first injection pipeline 4, the second imbibition pipeline 5 and the second injection pipeline 6.Described Ground Processing System comprises that oil gas extracting and processing module 7, microbial augmentation are repaired module 8, chemical oxidation is repaired module 9.Described oil gas extracting and processing module 7 include vavuum pump 7a, catch pot 7b and oil gas adsorption tanks 7c, the entrance of described catch pot 7b is connected with described extracting well head by extraction tube group 1, the outlet of described catch pot 7b is connected with the entrance of oil gas adsorption tanks 7c by transportation pipe 2a, on described transportation pipe 2a, be connected with vavuum pump 7a, the outlet of described oil gas adsorption tanks 7c communicates with atmosphere.Described microbial augmentation is repaired module 8 and is comprised microorganism and nutrient solution tank 8a, in described microorganism and nutrient solution tank 8a, be equiped with the first injection liquid, described microorganism is connected with the entrance of the first injection measurement pump 8b by the first imbibition pipeline 3 with nutrient solution tank 8a, the outlet of described the first injection measurement pump 8b is connected with described injection well head by the first injection pipeline 4, so that the first injection liquid is injected to unsaturation band soil, in unsaturation band soil after suction residual SVOCs carry out microbial augmentation degraded.Described chemical oxidation is repaired module 9 and is comprised chemical oxidizing agent batch tank 9a, in described chemical oxidizing agent batch tank 9a, be equiped with the second injection liquid, described chemical oxidizing agent batch tank 9a is connected with the entrance of described the second injection measurement pump 9b by the second imbibition pipeline 5, the outlet of described the second injection measurement pump 9b is connected with described injection well head by the second injection pipeline 6, so that the second injection liquid is injected to unsaturation band soil, carry out oxidative degradation to residual after microbial augmentation degraded in unsaturation band soil compared with heavy contaminant.
The present embodiment can aspirate near the VOCs(volatile organic compounds in soil extraction well by oil gas extracting and processing module 7, VOC), SVOCs(semivolatile-organic-chemicals, semi-volatile organic matter) and a small amount of moisture and Soil fine particles, by microbial augmentation repair module 8 can in soil after suction residual SVOCs carry out microbial augmentation degraded, repairs module 9 by chemical oxidation and can carry out oxidative degradation compared with heavy contaminant to residual after microbial augmentation is degraded in soil.That is to say, the present embodiment combines the in-situ remediation methods such as gaseous phase of soil suction, microbial augmentation degraded and chemical oxidation degraded, can realize rapidly and efficiently the repairing thoroughly of light oil contaminated soil, reduce the gas station that causes due to soil pollution and the environmental risk of near zone thereof.
Wherein, described vavuum pump 7a can be explosion-proof vortex vavuum pump, and described catch pot 7b can be cyclone-type catch pot, and described oil gas adsorption tanks 7c can be packing type oil gas adsorption tanks.In oil gas adsorption tanks 7c, active carbon bed 7d is housed.
According to an embodiment of the invention, each pipeline in described extraction tube group 1, transportation pipe 2a, the first imbibition pipeline 3, the first injection pipeline 4, the second imbibition pipeline 5 and the second injection pipeline 6 is respectively rubber hose, in described rubber hose, have liner, described liner is steel-wire carcass.
According to an embodiment of the invention, described the first injection liquid is oil degradation bacteria and nutritive salt mixed liquor, the composition quality percentage of described oil degradation bacteria and nutritive salt mixed liquor is: urea 2.1-3.0%, potassium dihydrogen phosphate 0.7-1.0%, metabolism matrix alpha-lactose 0.3-0.5% altogether, the oil degradation bacteria liquid 1.0-1.5% of biosurfactant production, all the other are fresh water.
Described the second injection liquid is oxidizing agent solution, and described oxidizing agent solution composition quality percentage is: potassium peroxydisulfate 3-5%, or the hydrogen peroxide 5-10% of 30% concentration, all the other are fresh water.
According to an embodiment of the invention, described microbial augmentation is repaired module 8 and is further comprised the first agitator 8c, first liquid filter 8d, the first control valve 8e and the first fire-proof motor 8f, described the first fire-proof motor 8f is electrically connected on the upper end of the first agitator 8c, described the first agitator 8c is connected on described microorganism and nutrient solution tank 8a, and the lower end of the first agitator 8c is positioned at described microorganism and nutrient solution tank 8a, so that described the first injection liquid is stirred, the upper end of described the first agitator 8c is positioned at the outside of described microorganism and nutrient solution tank 8a, on described the first imbibition pipeline 3, connect successively described the first control valve 8e and first liquid filter 8d.
In the present embodiment, the first fire-proof motor 8f drives the first agitator 8c to rotate, the first agitator 8c stirs the first injection liquid, the first injection liquid configuring is after first liquid filter 8d removes solid impurity, after the first injection measurement pump 8b pressurization, inject injector well by injection well head again, and infiltrate through near unsaturation band soil injector well, carry out microbial augmentation degraded to aspirating rear residual SVOCs.
Described chemical oxidation is repaired module 9 and is further comprised the second agitator 9c, second liquid filter 9d, the second control valve 9e and the second fire-proof motor 9f, described the second fire-proof motor 9f is electrically connected on the upper end of the second agitator 9c, described the second agitator 9c is connected on described chemical oxidizing agent batch tank 9a, and the lower end of the second agitator 9c is positioned at described chemical oxidizing agent batch tank 9a, so that the second injection liquid is stirred, the upper end of described the second agitator 9c is positioned at the outside of described chemical oxidizing agent batch tank 9a, on described the second imbibition pipeline 5, connect successively described the second control valve 9e and second liquid filter 9d.
In the present embodiment, the second fire-proof motor 9f drives the second agitator 9c to rotate, the second agitator 9c stirs the second injection liquid, the second injection liquid configuring is after second liquid filter 9d removes solid impurity, after the second injection measurement pump 9b pressurization, inject injector well by injection well head again, and infiltrate through near unsaturation band soil injector well, carry out oxidative degradation to residual after microbial augmentation degraded compared with heavy contaminant.
Described first liquid filter 8d and second liquid filter 9d can be respectively y-type filter.
According to an embodiment of the invention, described extraction tube group 1 comprises horizontal extracting house steward 1a, vertically extracting house steward 1b, multiple horizontal extracting arm 1c, multiple vertical extracting arm 1d, one end of described horizontal extracting house steward 1a connects the entrance of described oil gas adsorption tanks 7c, the upper end of the other end vertical connecting extracting house steward 1b of horizontal extracting house steward 1a, the lower end of described vertical extracting house steward 1b connects the outlet of described catch pot 7b, one end of described each horizontal extracting arm 1c connects respectively each vertical extracting arm 1d accordingly, the other end of each horizontal extracting arm 1c connects described extracting well head, the other end of described each vertical extracting arm 1d connects described horizontal extracting house steward 1a, described horizontal extracting house steward 1a or vertically extracting house steward 1b are provided with extracting house steward pneumatic filter 1e, extracting house steward control valve 1f and extracting house steward emptying valve 1g, on each horizontal extracting arm 1c or vertically extracting arm 1d, be connected with respectively extracting arm control valve 1h and flowmeter for pipe 1i is propped up in extracting.Described transportation pipe 2a is provided with transportation pipe control valve 2b, transportation pipe flowmeter 2c and the emptying valve 2d of transportation pipe, after described transportation pipe flowmeter 2c is arranged on vavuum pump 7a.The outlet of described oil gas adsorption tanks 7c connects purified gas delivery pipe 2f.
In the present embodiment, the operation of oil gas extracting and processing module specifically can be: after vortex vavuum pump 7a starts, in each extraction well, produce negative pressure, VOCs, SVOCs near the soil of extraction well and a small amount of moisture and Soil fine particles enter horizontal extracting arm 1c and vertical extracting arm 1d first successively through suction well head, collect and enter horizontal extracting house steward 1a and vertical extracting house steward 1b after flowmeter for pipe 1i is propped up in extracting; Then enter cyclone-type catch pot 7b and separate moisture and Soil fine particles, remove remaining Soil fine particles through extracting house steward pneumatic filter 1e again, after residual gas suction vortex vavuum pump 7a, transfer malleation to, enter after transportation pipe flowmeter 2c through transportation pipe 2a after packing type oil gas adsorption tanks 7c purification, by purified gas delivery pipe, 2f enters atmospheric environment again.
The bottom of described catch pot 7b and oil gas adsorption tanks 7b is respectively equipped with sewage draining valve 7e.Dirt in catch pot 7b and oil gas adsorption tanks 7b is discharged by sewage draining valve 7e separately respectively.
In addition, described oil gas extracting and processing module 7, microbial augmentation are repaired module 8, chemical oxidation is repaired module 9 and supporting electrical control cabinet 11, gang of wells assembly and storage cabinet 12 thereof, all can be arranged in a container 13 quick transition, assembling and startup that so can implement device.Furthermore, electrical control cabinet 11, vortex vavuum pump 7a, first and second injection measurement pump 8b, 9b, the electrical equipments such as first and second agitator 8c, 9c and parts are all explosion-proof, and explosive-proof grade can be Exde II BT4, to meet gas station's site safety needs.
Described the first injection measurement pump 8b and the lower of the second injection measurement pump 9b can arrange respectively yielding rubber pad 10.Explosion-proof axial flow fan 14 also can be set in container 13.On described catch pot 7b and oil gas adsorption tanks 7c, form 15 can be set respectively, to observe the situation in tank.Near described microorganism and nutrient solution tank 8a and chemical oxidizing agent batch tank 9a, explosion-proof lamp 16 can be set.
According to an embodiment of the invention, as shown in Figure 5-Figure 8, described extraction well 17, injector well 18 and ventilation monitoring well form by well screen assembly 19a and wellbore assembly 19b, aboveground portion is a wellbore assembly 19a, bottom is several well screen assemblies 19b, and the length of well is by the control of increase and decrease well screen assembly 19b quantity.Between pit shaft and well sieve, well sieves between well sieve to be threaded.The top of extraction well 17 is extraction tube 17a, and the top of injector well 18 is injection-tube 18a.
Feature and the advantage of the embodiment of the present invention are as follows:
1, it is applicable to the reparation of gas station's light oil pollution unsaturation band soil, specifically, is applicable to the light-end products that the VOCs such as gasoline, diesel oil, SVOCs are representative, and the unsaturation band soil darker apart from level of ground water.
2, in application prospect, as integration apparatus, be suitable as very much the auxiliary facility of gas station, the light oil contaminated soil having occurred is repaired fast; Also can be used as the supporting emergency service of gas station, once there is oil leak, can carry out emergency processing fast.
3, combine the in-situ remediation methods such as gaseous phase of soil suction, microbial augmentation degraded and chemical oxidation degraded, can realize rapidly and efficiently repairing thoroughly light oil contaminated soil.
4, device characteristic: integrated, modularization, starts rapidly, and transition is convenient.Explosive-proof grade is high, repairs and does not affect gas station's business.
Embodiment 2
The present embodiment has proposed a kind of in-situ remediation method of light oil pollution unsaturation band soil, and described method comprises step:
A, soil pollution scene, gas station is explored and sampling analysis, arrange quantity, distribution and the degree of depth of extraction well, injector well and ventilation monitoring well according to soil property and pollutant distribution situation;
The operation of B, oil gas extracting and processing module 7: vavuum pump 7a produces negative pressure after starting in each extraction well, near VOCs, SVOCs extraction well in soil and a small amount of moisture and Soil fine particles enter described extraction tube group 1 through described extracting well head; Enter described catch pot 7b via described extraction tube group 1 and separate moisture and Soil fine particles, transfer malleation to after sucking described vavuum pump 7a, then enter after described oil gas adsorption tanks 7b purifies and enter atmospheric environment through described transportation pipe 2a;
C, microbial augmentation are repaired the operation of module 8: the first injection liquid is prepared in described microorganism and compounding tank 8a, the first injection liquid injects unsaturation band soil by described injection well head and described injector well again after described the first injection measurement pump 8b pressurization, carries out microbial augmentation degraded to aspirating rear residual SVOCs;
D, chemical oxidation are repaired the operation of module 9: the second injection liquid is prepared in chemical oxidizing agent preparing tank 9a, after described the second injection measurement pump 9b pressurization, inject unsaturation band soil by described injection well head and described injector well again, carry out oxidative degradation to microbial augmentation degraded is residual afterwards compared with heavy contaminant.
According to an embodiment of the invention, when the described microbial augmentation in described step C is repaired module operation, described oil gas extracting and processing module be operation simultaneously also, thinks that underground oxygen supply promotes microbial degradation.
When described chemical oxidation in described step D is repaired module operation, described oil gas extracting and processing module be operation simultaneously also, thinks the degraded of underground oxygen supply accelerating oxidation.
Provide a specific embodiment below and further illustrate implementation step of the present invention:
The present embodiment is to complete at scene, gas station, Pulandian City, Dalian.Through reconnoitring and detecting analysis, pollution type is gasoline, diesel oil combined pollution, and soil property is dauk.
(1) underground wen system is installed.Totally 13 mouthfuls of on-the-spot well spacing, well depth is about 4.5m on average.Wherein 4 mouthfuls of extraction wells, 4 mouthfuls of injector wells, ventilation monitoring Jing6Kou; And extracting well head is installed on extraction well, injection well head is installed on injector well.
(2) connect aspiration line and the fluid injection pipeline between underground wen system and Ground Processing System, specifically extraction tube group 1, transportation pipe 2a, the first imbibition pipeline 3, the first injection pipeline 4, the second imbibition pipeline 5 and the second injection pipeline 6.
(3) oil gas extracting repairing phase: oil gas extracting and processing module 7 isolated operations, aspiration vacuum level-0.02MPa, individual well aspiration rate 30-50m3/h.Module adopts automated manner operation, after every operation 30min, and standby 120min, so circulation is carried out repeatedly.Oil gas extracting reparation totally 45 days.
(4) microbial augmentation repairing phase: divide 3 batches, inject oil degradation bacteria and nutritive salt mixed liquor about 360L altogether, its composition quality percentage is: urea 2.4%, potassium dihydrogen phosphate 0.8%, metabolism matrix alpha-lactose 0.4% altogether, biosurfactant production degradation bacteria liquid 1.5%, all the other are fresh water.Oil gas extracting and processing module 7 operate to subsequently underground oxygen supply and promote microbial degradation, aspiration vacuum level-0.025MPa, individual well aspiration rate 10-15m3/h; The operation of employing automated manner, after every operation 60min, standby 60min, so circulation is carried out repeatedly.Microbial augmentation reparation totally 90 days.
(5) chemical enhanced repairing phase: divide 5 batches, inject oxidizing agent solution about 250L altogether, its composition quality percentage is: potassium peroxydisulfate 5%, all the other are fresh water.Oil gas suction coordinates operation suction degraded to produce VOCs with processing module 7, aspiration vacuum level-0.02MPa, individual well aspiration rate 30-50m3/h; The operation of employing automated manner, after every operation 30min, standby 150min, so circulation is carried out repeatedly.Chemical enhanced repairing phase totally 15 days.
Within the field repair cycle of 150 days, soil oil content is down in average 3000mg/kg by initial average 25000mg/kg.Illustrate that the in-situ remediation method of functions such as being compounded with the degraded of soil vapor extraction, microbial augmentation and chemical oxidation degraded and device can be rapidly and efficiently, and repair more thoroughly the unsaturation band soil that light oil pollutes.
Other structures, operation principle and the beneficial effect of present embodiment is identical with embodiment 1, does not repeat them here.
The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various changes to the embodiment of the present invention according to application documents are disclosed, modification or combination and do not depart from the spirit and scope of the present invention.
Claims (10)
1. the in-situ repairing device of a light oil pollution unsaturation band soil, it is characterized in that, described device comprises: underground wen system, and it comprises extraction well, injector well and ventilation monitoring well, described extraction well has extracting well head, and described injector well has injection well head;
Pipe-line system, it comprises extraction tube group, transportation pipe, the first imbibition pipeline, the first injection pipeline, the second imbibition pipeline and the second injection pipeline;
Ground Processing System, it comprises:
Oil gas extracting and processing module, it includes vavuum pump, catch pot and oil gas adsorption tanks, the entrance of described catch pot is connected with described extracting well head by extraction tube group, the outlet of described catch pot is connected with the entrance of oil gas adsorption tanks by transportation pipe, on described transportation pipe, be connected with vavuum pump, the outlet of described oil gas adsorption tanks communicates with atmosphere;
Microbial augmentation is repaired module, it comprises microorganism and nutrient solution tank, in described microorganism and nutrient solution tank, be equiped with the first injection liquid, described microorganism is connected with the entrance of the first injection measurement pump by the first imbibition pipeline with nutrient solution tank, described the first injection measurement delivery side of pump is connected with described injection well head by the first injection pipeline, so that the first injection liquid is injected to unsaturation band soil, in unsaturation band soil after suction residual SVOCs carry out microbial augmentation degraded;
Chemical oxidation is repaired module, it comprises chemical oxidizing agent batch tank, in described chemical oxidizing agent batch tank, be equiped with the second injection liquid, described chemical oxidizing agent batch tank is connected with the entrance of described the second injection measurement pump by the second imbibition pipeline, described the second injection measurement delivery side of pump is connected with described injection well head by the second injection pipeline, so that the second injection liquid is injected to unsaturation band soil, carry out oxidative degradation to residual after microbial augmentation degraded in unsaturation band soil compared with heavy contaminant.
2. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, each pipeline in described extraction tube group, transportation pipe, the first imbibition pipeline, the first injection pipeline, the second imbibition pipeline and the second injection pipeline is respectively rubber hose, in described rubber hose, have liner, described liner is steel-wire carcass.
3. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, described the first injection liquid is oil degradation bacteria and nutritive salt mixed liquor, the composition quality percentage of described oil degradation bacteria and nutritive salt mixed liquor is: urea 2.1-3.0%, potassium dihydrogen phosphate 0.7-1.0%, metabolism matrix alpha-lactose 0.3-0.5% altogether, the oil degradation bacteria liquid 1.0-1.5% of biosurfactant production, all the other are fresh water.
4. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, described the second injection liquid is oxidizing agent solution, and described oxidizing agent solution composition quality percentage is: potassium peroxydisulfate 3-5%, or the hydrogen peroxide 5-10% of 30% concentration, all the other are fresh water.
5. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, described microbial augmentation is repaired module and is further comprised the first agitator, first liquid filter, the first control valve and the first fire-proof motor, described the first fire-proof motor is electrically connected on the upper end of the first agitator, described the first agitator is connected on described microorganism and nutrient solution tank, and the lower end of the first agitator is positioned at described microorganism and nutrient solution tank, so that described the first injection liquid is stirred, the upper end of described the first agitator is positioned at the outside of described microorganism and nutrient solution tank, on described the first imbibition pipeline, connect successively described the first control valve and first liquid filter.
6. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, described chemical oxidation is repaired module and is further comprised the second agitator, second liquid filter, the second control valve and the second fire-proof motor, described the second fire-proof motor is electrically connected on the upper end of the second agitator, described the second agitator is connected on described chemical oxidizing agent batch tank, and the lower end of the second agitator is positioned at described chemical oxidizing agent batch tank, so that the second injection liquid is stirred, the upper end of described the second agitator is positioned at the outside of described chemical oxidizing agent batch tank, on described the second imbibition pipeline, connect successively described the second control valve and second liquid filter.
7. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, described extraction tube group comprises horizontal extracting house steward, vertically extracting house steward, multiple horizontal extracting arms, multiple vertical extracting arms, one end of described horizontal extracting house steward connects the entrance of described oil gas adsorption tanks, horizontal extracting house steward's other end vertical connecting extracting house steward's upper end, described vertical extracting house steward's lower end connects the outlet of described catch pot, one end of described each horizontal extracting arm connects respectively each vertical extracting arm accordingly, the other end of each horizontal extracting arm connects described extracting well head, the other end of described each vertical extracting arm connects described horizontal extracting house steward, described horizontal extracting house steward or vertically extracting house steward are provided with described vavuum pump, carry and take out house steward's pneumatic filter, extracting house steward control valve and extracting house steward emptying valve, on each horizontal extracting arm or vertically extracting arm, be connected with respectively extracting arm control valve and flowmeter for pipe is propped up in extracting,
Described transportation pipe is provided with transportation pipe control valve, transportation pipe flowmeter and the emptying valve of transportation pipe, after described transportation pipe flowmeter is arranged on described vavuum pump;
The outlet of described oil gas adsorption tanks connects purified gas delivery pipe.
8. light oil according to claim 1 pollutes the in-situ repairing device of unsaturation band soil, it is characterized in that, the bottom of described catch pot and oil gas adsorption tanks is respectively equipped with sewage draining valve.
9. light oil according to claim 1 pollutes an in-situ remediation method for the in-situ repairing device of unsaturation band soil, it is characterized in that, described method comprises step:
A, soil pollution scene, gas station is explored and sampling analysis, arrange quantity, distribution and the degree of depth of extraction well, injector well and ventilation monitoring well according to soil property and pollutant distribution situation;
The operation of B, oil gas extracting and processing module: vavuum pump produces negative pressure after starting in each extraction well, near VOCs, SVOCs extraction well in soil and a small amount of moisture and Soil fine particles enter described extraction tube group through described extracting well head; Enter described catch pot via described extraction tube group and separate moisture and Soil fine particles, transfer malleation to after sucking described vavuum pump, then enter after described oil gas adsorption tanks purify and enter atmospheric environment through described transportation pipe;
C, microbial augmentation are repaired the operation of module: the first injection liquid is prepared in described microorganism and compounding tank, the first injection liquid injects unsaturation band soil by described injection well head and described injector well again after described the first injection measurement pump pressurization, carries out microbial augmentation degraded to aspirating rear residual SVOCs;
D, chemical oxidation are repaired the operation of module: the second injection liquid is prepared in chemical oxidizing agent preparing tank, after described the second injection measurement pump pressurization, inject unsaturation band soil by described injection well head and described injector well again, carry out oxidative degradation to microbial augmentation degraded is residual afterwards compared with heavy contaminant.
10. in-situ remediation method according to claim 9, is characterized in that, when the described microbial augmentation in described step C is repaired module operation, described oil gas extracting and processing module be operation simultaneously also, thinks that underground oxygen supply promotes microbial degradation;
When described chemical oxidation in described step D is repaired module operation, described oil gas extracting and processing module be operation simultaneously also, thinks the degraded of underground oxygen supply accelerating oxidation.
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| CN108687124A (en) * | 2017-04-04 | 2018-10-23 | (株）山河工程建筑 | Utilize soil contaminated by crude oil purifier in situ that is lower broken and forcing suction with pressure |
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