CN110627259A - Purification method of concrete mixing transport vehicle cleaning sewage - Google Patents
Purification method of concrete mixing transport vehicle cleaning sewage Download PDFInfo
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- CN110627259A CN110627259A CN201911020948.2A CN201911020948A CN110627259A CN 110627259 A CN110627259 A CN 110627259A CN 201911020948 A CN201911020948 A CN 201911020948A CN 110627259 A CN110627259 A CN 110627259A
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- 238000002156 mixing Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004140 cleaning Methods 0.000 title claims abstract description 34
- 239000010865 sewage Substances 0.000 title claims abstract description 29
- 238000000746 purification Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 158
- 239000004575 stone Substances 0.000 claims abstract description 69
- 238000003825 pressing Methods 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 238000004064 recycling Methods 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 13
- 239000013049 sediment Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 12
- 239000000706 filtrate Substances 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims abstract description 9
- 238000011001 backwashing Methods 0.000 claims abstract description 8
- 239000012065 filter cake Substances 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 238000005352 clarification Methods 0.000 claims description 8
- 239000010802 sludge Substances 0.000 claims description 7
- 239000002910 solid waste Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 230000002411 adverse Effects 0.000 claims description 4
- 239000000701 coagulant Substances 0.000 claims description 3
- 238000011085 pressure filtration Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims 7
- 238000004062 sedimentation Methods 0.000 description 14
- 239000011499 joint compound Substances 0.000 description 12
- 239000000654 additive Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/44—Nature of the water, waste water, sewage or sludge to be treated from vehicle washing facilities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A purification method for cleaning sewage of a concrete mixing truck belongs to the technical field of sewage treatment. Step 1, cleaning a transport vehicle: pumping clean water in a circulating water tank by a car washing pump for cleaning; step 2, recycling sand: sorting the cleaning sewage by adopting a sand-stone separator, and returning the sorted sand and stone aggregate to a material warehouse for recycling; step 3, pre-settling muddy water: conveying muddy water discharged by the sand-stone separator to a slope pre-settling tank for pre-settling and coarse-separating, conveying sediments to the sand-stone separator for backwashing, and allowing overflow of the pre-settling tank to enter a muddy water buffer tank; step 4, recycling mud water: directly conveying part of muddy water in the muddy water buffer pool to a stirring building for utilization; step 5, solid-liquid separation: the scheme of concentration plus filter pressing or direct filter pressing can be adopted to implement solid-liquid separation; step 6, filter pressing storage and transportation: the filtrate of the filter press is conveyed to a circulating water pool for reuse, and the filter cake is centrally stored and transported. The advantages are that: the method is simple, improves the circulating water quality, avoids the occurrence of silting, saves resources and has good use effect.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a purification method for cleaning sewage of a concrete mixing truck.
Background
Concrete mixing trucks are the primary means of transporting commercial concrete. In order to avoid the problem caused by the consolidation of the residual concrete in the storage tank of the concrete mixing and transporting truck, the residual concrete in the storage tank of the concrete mixing and transporting truck needs to be cleaned timely. The sewage generated in the cleaning process contains hydraulic materials such as sand stone, cement, fly ash, mineral powder and the like and concrete additives, which not only pollutes the environment, but also is not beneficial to reuse, so the cleaning water of the concrete mixing transport vehicle must be purified.
At present, in the cleaning water purification treatment of the concrete mixing transport vehicle, the cleaning water of the concrete mixing transport vehicle is purified by using a simple multi-stage slope sedimentation tank process, and the process has the problems of large occupied area, poor circulating water quality, easy occurrence of silting and the like. In the concentrated high-density car washing time period, the car washing sewage has large instantaneous flow and high solid concentration, the clarification effect of the multistage sedimentation tank is seriously influenced, and the quality of circulating water cannot be ensured. If the sediments in the multistage sedimentation tank are not cleaned in time, the upper water layer of the sedimentation tank is too shallow, the water flow speed is high, the particles are difficult to settle, the concentration of overflow muddy water is increased, the quality of circulating water is deteriorated, and the production is influenced. The sediment dug out from the sedimentation tank has high moisture and is difficult to transport, store and utilize.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides the purification method for the concrete mixing truck cleaning sewage, which has the advantages of simplicity, small occupied area, improvement on circulating water quality, prevention of clogging, resource saving and good use effect.
The technical scheme is as follows: the purpose of the invention is realized as follows: the cleaning water purification process method of the concrete mixing transport vehicle comprises the following steps:
step 1, cleaning a transport vehicle: pumping the precipitated water in the circulating water tank by using a vehicle washing pump for cleaning;
step 2, recycling sand: sorting the cleaning sewage by adopting a sand-stone separator, and returning the sorted sand and stone aggregate to a material warehouse for recycling;
step 3, pre-settling muddy water: conveying muddy water discharged by the sand-stone separator to a slope pre-settling tank for pre-settling and coarse-separating, conveying sediments to the sand-stone separator for backwashing, and allowing overflow of the pre-settling tank to enter a muddy water buffer tank;
step 4, recycling mud water: according to the production condition of the mixing plant, directly conveying part of the muddy water in the muddy water buffer tank to the mixing plant for utilization as appropriate;
step 5, solid-liquid separation: the scheme of concentration plus filter pressing or direct filter pressing can be adopted to implement solid-liquid separation;
step 6, filter pressing storage and transportation: the filtrate of the filter press is conveyed to a circulating water pool for reuse, and the filter cake is centrally stored and transported.
In the step 1, the transport vehicle is cleaned: and (4) pumping clear water from the circulating water tank by using a vehicle washing pump, washing the concrete mixing transport vehicle, and timely supplementing the clear water for the circulating water tank from the supplementing water tank.
In the step 2, sand and stone recovery: the carwash sewage is discharged into a sand-stone separator feed chute, the sand-stone separator is adopted to separate sand, stone and muddy water in the carwash sewage, and sand-stone aggregate selected by the sand-stone separator is returned to the material warehouse for recycling, so that resource waste is reduced.
In the step 3, the muddy water is pre-precipitated: muddy water discharged by the sand-stone separator is conveyed to the slope pre-settling tank for pre-settling and coarse-separating, sediment in the pre-settling tank is conveyed to the sand-stone separator for backwashing, sand-stone particles lost due to coarse running of the sand-stone separator are recovered, waste of sand-stone resources is reduced, and adverse effects of coarse grains on subsequent operation are reduced; the overflow of the pre-settling tank enters a muddy water buffer tank, and one-stage or multi-stage pre-settling tanks are arranged in the field space.
In the step 4, recycling the muddy water: according to the production condition of the mixing plant, on the premise of not influencing the concrete quality, part of muddy water in the muddy water buffer tank is conveyed to the mixing plant to be utilized according to the condition, so that the operation burden, the solid waste discharge amount and the clear water use amount of the mixing plant in the subsequent muddy water treatment are reduced.
In the step 5, solid-liquid separation: two solid-liquid separation schemes of concentration and filter pressing or direct filter pressing can be adopted:
(1) concentration + filter pressing solid-liquid separation scheme: conveying the sludge from the bottom of the sludge-water buffer tank to a concentration device through a feeding pump for clarification and concentration; the concentration device adds coagulant into the concentration device through a dosing device according to the requirement, so that the sludge concentration and clarification effects are improved, and overflow clear water of the concentration device is conveyed to a circulating water tank for reuse; the underflow slurry of the concentration device enters a stirring barrel through an underflow pump, is subjected to slurry mixing in the stirring barrel, and is sent to a filter press through a filter pressing feeding pump;
the concentration device selected according to the field space and the water quantity is a high-efficiency concentrator, a deep cone concentration tank or a hydrocyclone;
(2) direct filter-pressing separation scheme: when the field space is limited or the water quantity is small, and a concentration device is difficult to or does not need to be arranged, the slurry in the slurry buffer tank is directly conveyed to the stirring barrel through the underflow pump, and the slurry in the stirring barrel is directly conveyed to the filter press by the filter press feeding pump.
In the step 6, filter pressing storage and transportation: and (3) feeding the slurry in the stirring barrel into a filter press, carrying out filter pressing operation on the slurry, conveying the filtrate of the filter press to a circulating water tank for reuse, and carrying out site-selective stockpiling or resource utilization on the filter cake.
Has the advantages that: by adopting the scheme, the invention provides a complete, reliable, flexible and efficient purification process method aiming at the physicochemical characteristics of the cleaning sewage of the concrete mixing transport vehicle based on a mature sludge pump, a sand-stone separation device, a concentration device, a filter press and the like, has strong system adaptability, high circulating water quality, less solid waste discharge and low mud cake moisture, and can provide technical support for realizing clean production and building a green mixing plant for a commercial concrete mixing plant.
Because the car washing water has high alkalinity, high mineralization degree and high hardness, and is easy to separate out and scale on the surface of a water passing facility, and cement, fly ash and the like in the car washing water are hydraulic materials and have the phenomenon of solidifying and hanging on a wall, concentration equipment with simple structure and small solid-liquid contact surface is preferably adopted, the detention time of slurry in a concentration device is not too long, and concentration equipment such as a high-efficiency concentrator, a deep cone concentration tank, a hydrocyclone and the like can be selected according to the space and the water quantity on site.
The concrete mixing transport vehicle cleaning sewage purification process method provided by the invention is improved on the basis of the original process, and a set of more complete, reliable, flexible and efficient concrete mixing transport vehicle cleaning sewage purification process method is formed. The process system has strong adaptability, high circulating water quality, less solid waste discharge, low mud cake moisture and convenient transportation, storage and utilization. The concrete mixing transport vehicle cleaning sewage has high solid content, contains hydraulic materials and concrete additives, and needs to be treated and purified in order to save resources and protect the environment. The technical problem to be solved by the invention is to provide a complete, flexible, reliable and efficient process method for purifying the concrete mixing truck cleaning sewage.
The method is simple, occupies small area, improves the circulating water quality, avoids the occurrence of silting, saves resources, has good use effect and achieves the aim of the invention.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a flowchart of the method of example 1 of the present invention.
FIG. 3 is a flowchart of a method of embodiment 2 of the present invention.
Detailed Description
The concrete mixing transport vehicle cleaning water purification method comprises the following steps:
step 1, cleaning a transport vehicle: pumping clean water in a circulating water tank by a car washing pump for cleaning;
step 2, recycling sand: sorting the cleaning sewage by adopting a sand-stone separator, and returning the sorted sand and stone aggregate to a material warehouse for recycling;
step 3, pre-settling muddy water: conveying muddy water discharged by the sand-stone separator to a slope pre-settling tank for pre-settling and coarse-separating, conveying sediments to the sand-stone separator for backwashing, and allowing overflow of the pre-settling tank to enter a muddy water buffer tank;
step 4, recycling mud water: according to the production condition of the mixing plant, directly conveying part of the muddy water in the muddy water buffer tank to the mixing plant for utilization as appropriate;
step 5, solid-liquid separation: the scheme of concentration plus filter pressing or direct filter pressing can be adopted to implement solid-liquid separation;
step 6, filter pressing storage and transportation: the filtrate of the filter press is conveyed to a circulating water pool for reuse, and the filter cake is centrally stored and transported.
In the step 1, the transport vehicle is cleaned: and (4) pumping clear water from the circulating water tank by using a vehicle washing pump, washing the concrete mixing transport vehicle, and timely supplementing the clear water for the circulating water tank from the supplementing water tank.
In the step 2, sand and stone recovery: the carwash sewage is discharged into a sand-stone separator feed chute, the sand-stone separator is adopted to separate sand, stone and muddy water in the carwash sewage, and sand-stone aggregate selected by the sand-stone separator is returned to the material warehouse for recycling, so that resource waste is reduced.
In the step 3, the muddy water is pre-precipitated: muddy water discharged by the sand-stone separator is conveyed to the slope pre-settling tank for pre-settling and coarse-separating, sediment in the pre-settling tank is conveyed to the sand-stone separator for backwashing, sand-stone particles lost due to coarse running of the sand-stone separator are recovered, waste of sand-stone resources is reduced, and adverse effects of coarse grains on subsequent operation are reduced; the overflow of the pre-settling tank enters a muddy water buffer tank, and one-stage or multi-stage pre-settling tanks are arranged in the field space.
In the step 4, recycling the muddy water: according to the production condition of the mixing plant, on the premise of not influencing the concrete quality, part of muddy water in the muddy water buffer tank is conveyed to the mixing plant to be utilized according to the condition, so that the operation burden, the solid waste discharge amount and the clear water use amount of the mixing plant in the subsequent muddy water treatment are reduced.
In the step 5, solid-liquid separation: two solid-liquid separation schemes of concentration and filter pressing or direct filter pressing can be adopted:
(1) concentration + filter pressing solid-liquid separation scheme: conveying the sludge from the bottom of the sludge-water buffer tank to a concentration device through a feeding pump for clarification and concentration; the concentration device adds coagulant into the concentration device through a dosing device according to the requirement, so that the sludge concentration and clarification effects are improved, and overflow clear water of the concentration device is conveyed to a circulating water tank for reuse; the underflow slurry of the concentration device enters a stirring barrel through an underflow pump, is subjected to slurry mixing in the stirring barrel, and is sent to a filter press through a filter pressing feeding pump;
the concentration device selected according to the field space and the water quantity is a high-efficiency concentrator, a deep cone concentration tank or a hydrocyclone;
(2) direct filter-pressing separation scheme: when the field space is limited or the water quantity is small, and a concentration device is difficult to or does not need to be arranged, the slurry in the slurry buffer tank is directly conveyed to the stirring barrel through the underflow pump, and the slurry in the stirring barrel is directly conveyed to the filter press by the filter press feeding pump.
In the step 6, filter pressing storage and transportation: and (3) feeding the slurry in the stirring barrel into a filter press, carrying out filter pressing operation on the slurry, conveying the filtrate of the filter press to a circulating water tank for reuse, and carrying out site-selective stockpiling or resource utilization on the filter cake.
The invention will be further described with reference to examples in the drawings to which:
example 1: the invention discloses a cleaning water purification method for a concrete mixer truck, which is shown in figure 2.
Step 1, cleaning a transport vehicle: and (4) pumping clear water from the circulating water tank to clean the concrete mixing transport vehicle, and timely supplementing the circulating water tank with the clear water from the supplementing water tank.
Step 2, recycling sand: and discharging the carwash sewage into a feed chute of a sand-stone separator, separating sand, stone and mud in the carwash sewage by using the sand-stone separator, and returning sand-stone aggregate selected by the sand-stone separator to the material warehouse for recycling.
Step 3, pre-settling muddy water: a2-stage slope sedimentation tank arranged in the original process of the stirring station is used as a pre-sedimentation tank, muddy water discharged by the sand-stone separator is conveyed into the pre-sedimentation tank, sediment at the bottom of the No. 1 pre-sedimentation tank is periodically cleaned to ensure the height of a sedimentation water layer, the sediment cleaned in the No. 1 pre-sedimentation tank contains sand-stone particles coarse in the sand-stone separator, and the sediment is conveyed back into the sand-stone separator to recover coarse particles. No. 1 preliminary sedimentation tank overflow flows into No. 2 preliminary sedimentation tank, and No. 2 preliminary sedimentation tank bottom of the pool deposits in time to clear up in order to guarantee sufficient subside water layer height.
Step 4, recycling mud water: and (3) the overflowing muddy water of the No. 2 pre-settling tank enters a muddy water stirring buffer tank, and according to the production condition of the stirring building, part of muddy water in the muddy water buffer tank is conveyed to the stirring building for utilization on the premise of not influencing the concrete quality, so that the operation burden of subsequent muddy water treatment, the solid waste discharge amount and the clear water use amount of the stirring building are reduced.
Step 5, muddy water concentration: and conveying the muddy water in the stirring buffer tank to a concentration device by a pump for concentration and clarification. In this embodiment, the concentration device selects the cone-shaped concentration tank, and uses the automatic dosing machine to add an appropriate amount of flocculating agent as appropriate, and the overflow of the concentration device flows through the overflow pipe and is automatically conveyed to the circulating water tank. The concentration of the overflow clear water is less than 1.0g/L, and the water quality requirements of production and car washing of the mixing plant are completely met. And the underflow slurry of the concentration device enters a filter press feeding stirring barrel for size mixing.
Step 6, filter pressing storage and transportation: the filter press feeding stirring barrel is stirred and size-regulated, filter aid is added to improve the filtering effect, and a filter press feeding pump is used for conveying materials to a plate-and-frame filter press for filter pressing. The filtrate of the filter press enters a circulating water pool for recycling, and the water content of the mud cake obtained by pressure filtration is below 25 percent, so that the mud cake is easy to transport, store and utilize.
Example 2: the invention discloses a concrete mixing truck cleaning water purification method, which is shown in figure 3.
Step 1, cleaning a transport vehicle: and (4) pumping clear water from the circulating water tank to clean the concrete mixing transport vehicle, and timely supplementing the circulating water tank with the clear water from the supplementing water tank.
Step 2, recycling sand: and discharging the carwash sewage into a feed chute of a sand-stone separator, separating sand, stone and mud in the carwash sewage by using the sand-stone separator, and returning sand-stone aggregate selected by the sand-stone separator to the material warehouse for recycling.
Step 3, pre-settling muddy water: muddy water discharged by the sand-stone separator is conveyed to the slope pre-settling tank for pre-settling and coarse-separating, and sediment in the pre-settling tank is conveyed to the sand-stone separator for backwashing, so that lost sand-stone particles are recovered, waste of sand-stone resources is reduced, and adverse effects of coarse particles on subsequent operation are reduced; the overflow of the pre-settling tank enters a muddy water buffer tank, and one-stage or multi-stage pre-settling tanks are arranged in the field space.
Step 4, recycling mud water: according to the production condition of the mixing plant, on the premise of not influencing the concrete quality, part of muddy water in the muddy water buffer tank is conveyed to the mixing plant to be utilized according to the condition, so that the operation burden, the solid waste discharge amount and the clear water use amount of the mixing plant in the subsequent muddy water treatment are reduced.
Step 5, solid-liquid separation: when the field space is limited or the water quantity is small, and a concentration device is difficult to or does not need to be arranged, the slurry in the slurry buffer tank is directly conveyed to the stirring barrel through the underflow pump, and the slurry in the stirring barrel is directly conveyed to the filter press by the filter press feeding pump.
Step 6, filter pressing storage and transportation: the filter press feeding stirring barrel is stirred and size-regulated, filter aid is added to improve the filtering effect, and a filter press feeding pump is used for conveying materials to a plate-and-frame filter press for filter pressing. The filtrate of the filter press enters a circulating water pool for recycling, and the water content of the mud cake obtained by pressure filtration is below 25 percent, so that the mud cake is easy to transport, store and utilize.
Claims (8)
1. A purification method of cleaning sewage of a concrete mixing transport vehicle is characterized by comprising the following steps: the cleaning water purification process method of the concrete mixing transport vehicle comprises the following steps:
step 1, cleaning a transport vehicle: pumping clean water in a circulating water tank by a car washing pump for cleaning;
step 2, recycling sand: sorting the cleaning sewage by adopting a sand-stone separator, and returning the sorted sand and stone aggregate to a material warehouse for recycling;
step 3, pre-settling muddy water: conveying muddy water discharged by the sand-stone separator to a slope pre-settling tank for pre-settling and coarse-separating, conveying sediments to the sand-stone separator for backwashing, and allowing overflow of the pre-settling tank to enter a muddy water buffer tank;
step 4, recycling mud water: according to the production condition of the mixing plant, directly conveying part of the muddy water in the muddy water buffer tank to the mixing plant for utilization as appropriate;
step 5, solid-liquid separation: the scheme of concentration plus filter pressing or direct filter pressing can be adopted to implement solid-liquid separation;
step 6, storage, transportation and reuse: the filtrate of the filter press is conveyed to a circulating water pool for reuse, and the filter cake is centrally stored and transported.
2. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 1, the transport vehicle is cleaned: and (4) pumping clear water from the circulating water tank by using a vehicle washing pump, washing the concrete mixing transport vehicle, and timely supplementing the clear water for the circulating water tank from the supplementing water tank.
3. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 2, sand and stone recovery: the carwash sewage is discharged into a sand-stone separator feed chute, the sand-stone separator is adopted to separate sand, stone and muddy water in the carwash sewage, and sand-stone aggregate selected by the sand-stone separator is returned to the material warehouse for recycling, so that resource waste is reduced.
4. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 3, the muddy water is pre-precipitated: muddy water discharged by the sand-stone separator is conveyed to the slope pre-settling tank for pre-settling and coarse-separating, sediment in the pre-settling tank is conveyed to the sand-stone separator for backwashing, sand-stone particles lost due to coarse running of the sand-stone separator are recovered, waste of sand-stone resources is reduced, and adverse effects of coarse grains on subsequent operation are reduced; the overflow of the pre-settling tank enters a muddy water buffer tank, and one-stage or multi-stage pre-settling tanks are arranged in the field space.
5. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 4, recycling the muddy water: according to the production condition of the mixing plant, on the premise of not influencing the concrete quality, part of muddy water in the muddy water buffer tank is conveyed to the mixing plant to be utilized according to the condition, so that the operation burden, the solid waste discharge amount and the clear water use amount of the mixing plant in the subsequent muddy water treatment are reduced.
6. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 5, solid-liquid separation: a solid-liquid separation scheme of concentration and filter pressing is adopted;
concentration + filter pressing solid-liquid separation scheme: conveying the sludge from the bottom of the sludge-water buffer tank to a concentration device through a feeding pump for clarification and concentration; the concentration device adds coagulant into the concentration device through a dosing device according to the requirement, so that the sludge concentration and clarification effects are improved, and overflow clear water of the concentration device is conveyed to a circulating water tank for reuse; the underflow slurry of the concentration device enters a stirring barrel through an underflow pump, is subjected to slurry mixing in the stirring barrel, and is sent to a filter press through a filter pressing feeding pump;
the concentration device selected according to the field space and the water quantity is a high-efficiency concentrator, a deep cone concentration tank or a hydrocyclone.
7. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 5, solid-liquid separation: a solid-liquid separation scheme of direct pressure filtration is adopted;
direct filter-pressing separation scheme: when the field space is limited or the water quantity is small, and a concentration device is difficult to or does not need to be arranged, the slurry in the slurry buffer tank is directly conveyed to the stirring barrel through the underflow pump, and the slurry in the stirring barrel is directly conveyed to the filter press by the filter press feeding pump.
8. The method for purifying the concrete mixer truck washing wastewater according to claim 1, wherein the method comprises the following steps: in the step 6, filter pressing storage and transportation: and (3) feeding the slurry in the stirring barrel into a filter press, carrying out filter pressing operation on the slurry, conveying the filtrate of the filter press to a circulating water tank for reuse, and carrying out site-selective stockpiling or resource utilization on the filter cake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020948.2A CN110627259A (en) | 2019-10-25 | 2019-10-25 | Purification method of concrete mixing transport vehicle cleaning sewage |
Applications Claiming Priority (1)
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| CN111072186A (en) * | 2020-01-19 | 2020-04-28 | 中国矿业大学 | System and method for cleaning commercial concrete mixing plant transportation tank car and purifying station sewage |
| CN111941626A (en) * | 2020-08-01 | 2020-11-17 | 中电建成都混凝土制品有限公司 | Design method of environment-friendly intelligent production system for concrete prefabricated part |
| CN112479504A (en) * | 2020-12-03 | 2021-03-12 | 佛山市深蓝维士养殖设备有限公司 | Breed sewage treatment device |
| CN112933734A (en) * | 2021-03-05 | 2021-06-11 | 泉州协创机械有限公司 | Zero-emission waste treatment system and method |
| CN113336384A (en) * | 2021-04-20 | 2021-09-03 | 中冶南方城市建设工程技术有限公司 | Method and device for quickly treating and recycling sewage in car washing tank |
| CN113842797A (en) * | 2020-06-28 | 2021-12-28 | 北京都市绿源环保科技有限公司 | Method for recycling slurry water of mixing plant |
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Application publication date: 20191231 |