CN213728538U - Pollute soil normal position drip washing system - Google Patents
Pollute soil normal position drip washing system Download PDFInfo
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- CN213728538U CN213728538U CN202021935561.8U CN202021935561U CN213728538U CN 213728538 U CN213728538 U CN 213728538U CN 202021935561 U CN202021935561 U CN 202021935561U CN 213728538 U CN213728538 U CN 213728538U
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- 238000002360 preparation method Methods 0.000 claims abstract description 62
- 238000000605 extraction Methods 0.000 claims abstract description 56
- 239000010865 sewage Substances 0.000 claims abstract description 49
- 238000002386 leaching Methods 0.000 claims abstract description 40
- 238000005507 spraying Methods 0.000 claims abstract description 38
- 238000004064 recycling Methods 0.000 claims abstract description 26
- 238000011065 in-situ storage Methods 0.000 claims abstract description 19
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- 150000001875 compounds Chemical class 0.000 claims abstract description 15
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- 230000001617 migratory effect Effects 0.000 claims abstract description 8
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 230000001112 coagulating effect Effects 0.000 claims description 18
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Abstract
An in-situ leaching system for polluted soil, which comprises an eluent preparation unit, an eluent spraying unit, an eluent extraction unit and a sewage treatment and recycling unit; the eluent preparation unit is communicated with the eluent spraying unit and is used for preparing an eluent and conveying the prepared eluent to the eluent spraying unit; the eluent spraying unit is positioned above the polluted soil area and used for spraying the eluent on the polluted soil area, so that the eluent and pollutants in the polluted soil interact with each other to form a transferable compound to be dissolved in the eluent; the eluent extraction unit is positioned in the polluted soil or at the periphery of the polluted soil and is used for extracting the eluent containing the migratory compound from the polluted soil and discharging the eluent as sewage to the sewage treatment and recycling unit; and the sewage treatment and recycling unit is communicated with the eluent extraction unit and is used for purifying the sewage discharged by the eluent extraction unit.
Description
Technical Field
The utility model relates to a soil remediation technical field, concretely relates to pollute soil normal position drip washing system.
Background
The in-situ leaching technology of the polluted soil is a technology that a leaching agent is injected into the soil through an injection well and the like, the soil is enabled to permeate downwards, a migratory compound is formed through the interaction of the leaching agent and pollutants in the soil, and the eluting agent and the pollutants are collected and treated through an extraction well and the like.
The in-situ leaching technology of the polluted soil is one of important soil remediation technologies, and has mature and wide application in the remediation of the polluted soil at home and abroad. Has the advantages of no need of cleaning and transporting polluted soil, suitability for removing various pollutants in aeration zones and saturated zones, suitability for combined processes and the like. In recent years, some reports about systems and methods for in-situ leaching of polluted soil appear in China, but all have certain disadvantages.
Patent No. CN 109570212A's utility model discloses a prosthetic method of soil normal position drip washing, patent No. CN 203853374U's utility model discloses a pollute soil normal position drip washing processing system, above-mentioned 2 patents can carry out normal position drip washing to polluting soil and restore, but all have the construction complicacy, drip washing influence area is little, the seepage flow is uneven, repair effect subalternation problem.
In view of various defects and limitations of the existing in-situ leaching and repairing method and system for the polluted soil, the development of the in-situ leaching and repairing system and method for the polluted soil, which are economical, applicable and convenient to operate, has important social significance and environmental value.
SUMMERY OF THE UTILITY MODEL
In view of technical defect and the technical drawback that exist among the prior art, the embodiment of the utility model provides a contaminated soil normal position drip washing system who overcomes above-mentioned problem or solve above-mentioned problem at least partially, the concrete scheme is as follows:
an in-situ leaching system for polluted soil, which comprises an eluent preparation unit, an eluent spraying unit, an eluent extraction unit and a sewage treatment and recycling unit;
the eluent preparation unit is communicated with the eluent spraying unit and is used for preparing an eluent and conveying the prepared eluent to the eluent spraying unit;
the eluent spraying unit is positioned above the polluted soil area and used for spraying the eluent on the polluted soil area, so that the eluent enters the polluted soil through the permeation action and interacts with pollutants in the polluted soil, and the pollutants form a transferable compound to be dissolved in the eluent;
the eluent extraction unit is positioned in the polluted soil or at the periphery of the polluted soil and is used for extracting the eluent containing the migratory compound from the polluted soil and discharging the eluent as sewage to the sewage treatment and recycling unit;
and the sewage treatment and recycling unit is communicated with the eluting agent extraction unit and is used for purifying the sewage discharged by the eluting agent extraction unit and recycling the purified water.
Further, the eluent preparation unit comprises a medicine preparation tank, a medicine storage tank and a medicine delivery pump, the medicine preparation tank is communicated with the medicine storage tank through a first pipeline, an inlet of the medicine delivery pump is communicated with the medicine storage tank through a second pipeline, an outlet of the medicine delivery pump is communicated with the eluent spraying unit through a third pipeline, and a medicine discharge electric valve for controlling the on/off of the first pipeline is arranged on the first pipeline;
the agent preparation tank is used for preparing an eluent; the electric valve for discharging the eluent is used for controlling the conduction of the first pipeline after the eluent is prepared, so that the prepared eluent flows into the medicament storage tank through the first pipeline;
and the medicament delivery pump is used for pumping the eluent from the medicament storage tank and delivering the eluent to the eluent spraying unit.
Furthermore, the eluent preparation unit further comprises a water supply device and a medicament conveying device, wherein a stirrer is arranged in the medicament preparation tank, the water supply device and the medicament conveying device are both communicated with the medicament preparation tank, the medicament conveying device is used for conveying elution medicaments with preset metering to the medicament preparation tank, the water supply device is used for adding clean water with preset metering to the medicament preparation tank according to preparation concentration, and the stirrer is used for stirring the medicaments and the clean water added to the medicament preparation tank so as to prepare the eluent.
Further, the eluent spraying unit comprises a main agent conveying pipe, branch agent conveying pipes and agent spraying heads, the main agent conveying pipe is communicated with the eluent preparation unit, the main agent conveying pipe is communicated with the main agent conveying pipes, the main agent conveying pipes are communicated with the main agent conveying pipes, the branch agent conveying pipes are communicated with the branch agent conveying pipes, and the branch agent conveying pipes are distributed below the branch agent conveying pipes and communicated with the branch agent conveying pipes, wherein the branch agent conveying pipes are distributed in each area above the polluted soil area, and the agent spraying heads are located below the branch agent conveying pipes and just face the polluted soil area below the branch agent conveying pipes.
Furthermore, the eluent extraction unit comprises an extraction well, an outdoor branch pipe, an outdoor main pipe and a water pump; the extraction well, the out-well branch pipe, the out-well main pipe and the water pump are sequentially communicated, and an outlet of the water pump is communicated with the sewage treatment and recycling unit; the extraction wells are communicated with the outdoor main pipe through an outdoor branch pipe, the extraction wells are distributed in or on the periphery of the polluted soil respectively, under the suction action of a water pump, an eluent dissolved with a movable compound enters the extraction wells, and finally enters the sewage treatment and recycling unit from an outlet of the water pump through the outdoor branch pipe, the outdoor main pipe and the outdoor main pipe in sequence.
Further, the eluent extraction unit comprises a controller used for controlling the water pump to be started or closed, a liquid level meter is installed in the extraction well, the liquid level meter and the water pump are electrically connected with the controller, the liquid level meter is used for monitoring the water level in the extraction well and transmitting water level information to the controller, and the controller is used for controlling the water pump to be started or closed according to the water level information.
Further, every all be provided with one section telescopic joint on the branch pipe outside the well, can carry out the shrink of certain degree along with the pipeline atress, avoid the pipeline to be destroyed because of great deformation.
Furthermore, a check valve and a ball valve are further arranged on the out-of-well branch pipe to prevent eluting agent containing movable compounds from flowing back to the extraction wells, and flowmeters are arranged on the out-of-well branch pipe and the out-of-well main pipe and are used for monitoring the working operation conditions of the extraction wells.
Further, sewage treatment and retrieval and utilization unit includes equalizing basin, coagulating sedimentation tank and quartz sand filtration system, the equalizing basin the coagulating sedimentation tank with quartz sand filtration system communicates along sewage circulation direction in proper order, the entry and the eluting agent extraction unit intercommunication of equalizing basin for receive eluting agent extraction unit exhaust sewage, quartz sand filters including quartz sand filter and retrieval and utilization pond, sewage gets into after equalizing basin, coagulating sedimentation tank and quartz sand filter purification treatment in proper order the retrieval and utilization pond.
Further, sewage treatment and retrieval and utilization unit still includes sludge processing system, sludge processing system is including the sludge impoundment that communicates in proper order and fold spiral shell sludge dewaterer, the entry and the coagulating sedimentation tank intercommunication in sludge impoundment for receive the mud of discharging in the mud fill of coagulating sedimentation tank, and will sludge is carried extremely fold spiral shell sludge dewaterer and carry out the filter-pressing
Furthermore, the system also comprises an automatic control unit which is used for controlling other units of the system, and the automatic control unit comprises a remote control system, a data acquisition system, a monitoring system and a power distribution cabinet.
The utility model discloses following beneficial effect has:
1. the integrated eluent preparation unit has the dual functions of stirring and storing the medicaments, the discharge of the medicaments is controlled by the electric valve between the medicament preparation tank and the medicament storage tank, the stored medicaments can be conveyed outwards by the medicament conveying pump, and the automatic feeding of the medicament preparation can be realized by the medicament conveying device and the water supply system. The uniformly distributed agent delivery main pipes and the agent delivery branch pipes can uniformly deliver the leaching agent to the agent spray header. The densely distributed agent spray headers can uniformly spray the leaching agent on the upper part of the polluted soil. The eluent extraction unit arranged around the polluted soil area can effectively extract the eluent with pollutants, the suction effect can also promote the permeation of the eluent in the polluted soil, and the liquid level meter in the extraction well can automatically control the opening and closing of the water pump. The sewage treatment and recycling unit can effectively remove pollutants in the sewage through coagulating sedimentation and filtration, and the standard of the recycling water of the system is achieved. The automatic control unit can carry out full automatic control to above process, and the staff only need alone regularly to patrol inspection operational aspect, greatly reduces intensity of labour.
2. The utility model provides a pollute soil normal position drip washing system has advantages such as need not excavate, transport and pollute soil, need not build more soil repair facility, can be used to the restoration of various contaminated soil, has good environmental protection benefit and social.
Drawings
Fig. 1 is a schematic view of an overall structure of an in-situ contaminated soil leaching system provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an eluent preparation unit provided in an embodiment of the present invention;
fig. 3 is a top view of an eluent spray unit provided in an embodiment of the present invention;
fig. 4 is a cross-sectional view of an eluent spray unit provided in an embodiment of the present invention;
fig. 5 is a top view of an eluent extraction unit provided in an embodiment of the present invention;
fig. 6 is a cross-sectional view of an eluent extraction unit provided in an embodiment of the present invention;
in the figure: 11. the system comprises a medicament preparation tank, 12, a medicament storage tank, 13, a medicament discharge electric valve, 14, a medicament delivery pump, 21, a medicament delivery main pipe, 22, a medicament delivery main pipe, 23, a medicament delivery branch pipe, 24, a medicament spray header, 31, an extraction well, 32, an out-of-well branch pipe, 33, an out-of-well main pipe, 34, an out-of-well main pipe, 35 and a water pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, as a first embodiment of the present invention, a contaminated soil in-situ leaching system is provided, which comprises a leaching agent preparation unit, a leaching agent spraying unit, a leaching agent extraction unit, and a sewage treatment and recycling unit;
the eluent preparation unit is communicated with the eluent spraying unit and is used for preparing an eluent and conveying the prepared eluent to the eluent spraying unit;
the eluent spraying unit is positioned above the polluted soil area and used for spraying the eluent on the polluted soil area, so that the eluent enters the polluted soil through the permeation action and interacts with pollutants in the polluted soil, and the pollutants form a transferable compound to be dissolved in the eluent;
the eluent extraction unit is positioned in the polluted soil or at the periphery of the polluted soil and is used for extracting the eluent containing the migratory compound from the polluted soil and discharging the eluent as sewage to the sewage treatment and recycling unit;
and the sewage treatment and recycling unit is communicated with the eluting agent extraction unit and is used for purifying the sewage discharged by the eluting agent extraction unit and recycling the purified water.
As shown in fig. 2, preferably, the eluent preparation unit comprises a medicine preparation tank 11, a medicine storage tank 12 and a medicine delivery pump 14, the medicine preparation tank 11 and the medicine storage tank 12 are communicated through a first pipeline, an inlet of the medicine delivery pump 14 is communicated with the medicine storage tank 12 through a second pipeline, an outlet of the medicine delivery pump 14 is communicated with the eluent spray unit through a third pipeline, and a medicine discharge electric valve 13 for controlling the on/off of the first pipeline is arranged on the first pipeline;
as shown in fig. 2. The agent preparation tank 11 is located above the agent storage tank 12, after the agent preparation tank 11 finishes the preparation of the eluent, the electric valve 13 for discharging the eluent is opened, the agent in the agent preparation tank 11 automatically flows into the agent storage tank 12 to be stored, and the eluent in the agent storage tank 12 is conveyed to the eluent spraying unit through the agent conveying pump 14 to be sprayed with the agent. The pipeline of the medicament delivery pump 14 is provided with a flow meter for metering the spraying medicament.
The agent preparation tank 11 is used for preparing an eluent; the electric medicine discharging valve 13 is used for controlling the conduction of the first pipeline after the eluent is prepared, so that the prepared eluent flows into the medicine storage tank 12 through the first pipeline;
the agent delivery pump 14 is used to draw eluent from the agent storage tank 12 and deliver it to an eluent spray unit.
Preferably, the eluent preparation unit further comprises a water supply device and a medicament delivery device, wherein a stirrer is arranged in the medicament preparation tank 11, the water supply device and the medicament delivery device are both communicated with the medicament preparation tank 11, the medicament delivery device is used for delivering elution medicaments with preset metering to the medicament preparation tank 11, the water supply device is used for adding clean water with preset metering to the medicament preparation tank 11 according to preparation concentration, and the stirrer is used for stirring the medicaments and the clean water added to the medicament preparation tank 11 so as to prepare the eluent.
The polluted soil is preferably a heavy metal polluted soil area, the medicament conveying device can be a belt conveyor with a belt scale, the leaching medicament can be a solid or liquid medicament, and the leaching medicament and clear water can be automatically added through the water supply device and the medicament conveying device.
As shown in fig. 3-4, preferably, the eluent spraying unit includes a main drug delivery pipe 21, a main drug delivery pipe 22, branch drug delivery pipes 23, and a drug spray header 24, an inlet of the main drug delivery pipe 21 is communicated with the eluent preparation unit, an outlet of the main drug delivery pipe 21 is communicated with the plurality of main drug delivery pipes 22, the plurality of branch drug delivery pipes 23 are communicated with each main drug delivery pipe 22, and the plurality of drug spray headers 24 communicated with the branch drug delivery pipes 23 are arranged under each branch drug delivery pipe 23, wherein the branch drug delivery pipes 23 are distributed in each area above the contaminated soil area, and the drug spray header 24 is located under the branch drug delivery pipes 23 and faces the contaminated soil area under the branch drug delivery pipes 23.
The agent conveying main pipe 22 is uniformly distributed outwards with the agent conveying main pipe 21 as the center and above the contaminated soil area, a plurality of agent conveying branch pipes 23 are uniformly distributed on each agent conveying main pipe 22, and a plurality of agent spray headers 24 communicated with the agent conveying branch pipes 23 are uniformly distributed below each agent conveying branch pipe 23, so that the agent spray headers 24 can be uniformly and densely distributed above the contaminated soil area, and leaching agents are uniformly sprayed in the contaminated soil area through the agent spray headers 24.
As shown in fig. 5-6, the eluent extraction unit preferably comprises an extraction well 31, an out-of-well branch pipe 32, an out-of-well trunk pipe 33, an out-of-well main pipe 34 and a water pump 35. The eluent extraction unit is shown in fig. 3. The leaching agent sprayed by the leaching agent spraying unit enters a contaminated soil area through a permeation effect, interacts with pollutants in the soil to enable the pollutants to form a migratory compound to be dissolved in the leaching agent, then the extraction well 31 arranged at the periphery of the contaminated area extracts the leaching agent containing the pollutants into the out-of-well branch pipe 32 under the extraction effect of the water pump 35, and the leaching agent is converged into the out-of-well main pipe 33 through the out-of-well branch pipe 32, then converged into the out-of-well main pipe 34 and pumped and discharged to the sewage treatment and recycling unit. The eluent extraction unit comprises a controller used for controlling the water pump 35 to be opened or closed, a liquid level meter is installed in the extraction well 31, the liquid level meter and the water pump 35 are electrically connected with the controller, the liquid level meter is used for monitoring the water level in the extraction well 31 and transmitting water level information to the controller, and after the water level is reduced to a certain depth, the liquid level meter automatically controls the water pump 35 to be closed. The outer well support pipe 32 is provided with a section of expansion joint, which can shrink to a certain degree along with the stress of the pipeline, and the pipeline is prevented from being damaged due to larger deformation. The external well branch pipes 32 are provided with 1 check valve and 1 ball valve to prevent eluent containing migratable compounds from flowing back to the extraction well 31. The external well branch pipe 32 and the external well main pipe 34 are provided with 1 flow meter for monitoring the working and operating conditions of each extraction well 31.
Preferably, the sewage treatment and recycling unit comprises an adjusting tank, a coagulating sedimentation tank, a quartz sand filtering system and a sludge treatment system, wherein the adjusting tank, the coagulating sedimentation tank and the quartz sand filtering system are sequentially connected along the sewage flowing direction. The coagulating sedimentation tank is connected with the sludge treatment system along the sludge direction. The adjusting tank is mainly used for collecting sewage and adjusting the water quality and quantity of the sewage, so that the water supply of subsequent operation achieves the effect of homogenizing and equalizing quantity, and the load of subsequent treatment equipment is reduced. The coagulating sedimentation tank consists of a reaction zone and a sedimentation zone. The reaction zone is mainly used for adding various medicaments to enable the reaction zone to react and flocculate with pollutants in the wastewater, and the sedimentation zone is mainly used for separating sludge and water from flocculated bodies. The settling zone is provided with an inclined tube filler, sludge after mud-water separation is deposited in a mud bucket and is periodically lifted to a sludge tank, and supernatant fluid overflows to a clear water tank of the coagulating sedimentation tank through an effluent weir and is then lifted to the quartz sand filtering system through a lifting pump. The quartz sand filtering system consists of a quartz sand filter and a reuse water pool. And sewage enters the reuse water tank for storage after passing through the quartz sand filter, and the reuse water tank also provides a water source for backwashing of the quartz sand filter through a pump. Meanwhile, the water in the reuse water tank is used for supplementing water for preparing the medicament of the eluent preparation unit or is discharged after reaching the standard. The sludge treatment system consists of a sludge tank and a spiral sludge dehydrator. And lifting the sludge entering the sludge tank to the spiral sludge dehydrator periodically for filter pressing. And (4) refluxing the filtrate to the regulating tank, and transporting the dry sludge to an outside for disposal.
Preferably, the system further comprises an automatic control unit for controlling other units of the system, wherein the automatic control unit comprises a remote control system, a data acquisition system, a monitoring system and a power distribution cabinet.
The working principle of the utility model is as follows:
1. determining proper eluting agent dosage and preparation concentration according to the pollutant types, pollution conditions and site conditions of a site, based on the eluting agent dosage and the preparation concentration, conveying elution agents with preset measurement to the agent preparation tank 11 through the agent conveying device, adding clean water with preset measurement to the agent preparation tank 11 through the water supply device, starting a stirrer in the agent preparation tank 11, starting a medicine discharging electric valve 13 after the elution agents are completely dissolved, and enabling the elution agents in the agent preparation tank 11 to automatically flow into the agent storage tank 12;
2. the eluent in the agent storage tank 12 is conveyed to an agent conveying main pipe 21 of an eluent spraying unit through an agent conveying pump 14, and reaches an agent spraying head 24 at the lower part of an agent conveying branch pipe 23 through an agent conveying main pipe 22 and an agent conveying branch pipe 23, and the eluent is sprayed in the polluted soil area through the agent spraying heads 24 distributed in each area of the polluted soil area, so that the eluent and pollutants in the polluted soil interact to form a migratory compound which is dissolved in the eluent;
3. starting a water pump 35 of the eluent extraction unit, enabling the eluent dissolved with the migratory compound to sequentially enter an extraction well 31, an out-of-well branch pipe 32, an out-of-well main pipe 33 and an out-of-well main pipe 34 under the suction action of the water pump 35, and finally being sucked into a regulating reservoir of the sewage treatment and recycling unit;
4. and 3, enabling the sewage generated in the step 3 to enter an adjusting tank for homogenizing and uniform treatment, lifting the sewage to a coagulation sedimentation tank by a sewage pump 35, adding alkali in a reaction zone to adjust the pH value of the sewage, adding a capture agent to capture ions, and finally adding a coagulant PAC and PAM to destabilize suspended matter particles in the sewage, wherein colloidal particles are mutually condensed to enlarge the particles to form floccules and alumen ustum. And the flocculate enters a settling zone for sludge-water separation. And pumping the supernatant overflowing from the coagulating sedimentation tank to a quartz sand filtering system. The quartz sand filter further removes pollutants in the sewage, and achieves a fine filtering effect. The treated sewage enters a reuse water tank for storage, and then is used for preparing supplementary water for the preparation of the eluent preparation unit or is discharged after reaching the standard. Sludge from the coagulating sedimentation tank is stored in a sludge tank in the sludge treatment system and is periodically lifted to a spiral sludge dewatering machine for filter pressing.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. An in-situ leaching system for polluted soil is characterized by comprising an eluent preparation unit, an eluent spraying unit, an eluent extraction unit and a sewage treatment and recycling unit; the eluent preparation unit is communicated with the eluent spraying unit and is used for preparing an eluent and conveying the prepared eluent to the eluent spraying unit; the eluent spraying unit is positioned above the polluted soil area and used for spraying the eluent on the polluted soil area, so that the eluent and pollutants in the polluted soil interact with each other to form a transferable compound to be dissolved in the eluent; the eluent extraction unit is positioned in the polluted soil or at the periphery of the polluted soil and is used for extracting the eluent containing the migratory compound from the polluted soil and discharging the eluent as sewage to the sewage treatment and recycling unit; and the sewage treatment and recycling unit is communicated with the eluent extraction unit and is used for purifying the sewage discharged by the eluent extraction unit.
2. The in-situ contaminated soil leaching system according to claim 1, wherein the eluent preparation unit comprises a reagent preparation tank, a reagent storage tank and a reagent delivery pump, the reagent preparation tank and the reagent storage tank are communicated through a first pipeline, an inlet of the reagent delivery pump is communicated with the reagent storage tank through a second pipeline, an outlet of the reagent delivery pump is communicated with the eluent spraying unit through a third pipeline, and a discharge electric valve for controlling the first pipeline to pass/break is arranged on the first pipeline; the agent preparation tank is used for preparing an eluent; the electric valve for discharging the eluent is used for controlling the conduction of the first pipeline after the eluent is prepared, so that the prepared eluent flows into the medicament storage tank through the first pipeline; and the medicament delivery pump is used for pumping the eluent from the medicament storage tank and delivering the eluent to the eluent spraying unit.
3. The in-situ contaminated soil leaching system according to claim 2, wherein the leaching agent preparation unit further comprises a water supply device and a reagent delivery device, wherein an agitator is arranged in the reagent preparation tank, the water supply device and the reagent delivery device are both communicated with the reagent preparation tank, the reagent delivery device is used for delivering leaching agents with preset metering to the reagent preparation tank, the water supply device is used for adding clean water with preset metering to the reagent preparation tank according to preparation concentration, and the agitator is used for agitating the reagents and the clean water added to the reagent preparation tank so as to prepare the leaching agent.
4. The in-situ contaminated soil leaching system according to claim 1, wherein the leaching agent spraying unit comprises a main agent conveying pipe, main agent conveying pipes, branch agent conveying pipes and agent spraying heads, the inlet of the main agent conveying pipe is communicated with the leaching agent preparation unit, the outlet of the main agent conveying pipe is communicated with the main agent conveying pipes, each main agent conveying pipe is communicated with the branch agent conveying pipes, a plurality of branch agent conveying pipes are arranged below each branch agent conveying pipe, the agent spraying heads communicated with the branch agent conveying pipes are distributed in each area above the contaminated soil area, and the agent spraying heads are located below the branch agent conveying pipes and face the contaminated soil area below the branch agent conveying pipes.
5. The in-situ contaminated soil leaching system according to claim 1, wherein said leaching agent extraction unit comprises an extraction well, an out-of-well branch pipe, an out-of-well trunk pipe, an out-of-well main pipe and a water pump; the extraction well, the out-well branch pipe, the out-well main pipe and the water pump are sequentially communicated, and an outlet of the water pump is communicated with the sewage treatment and recycling unit; the device comprises a plurality of extraction wells, wherein each extraction well is communicated with an outdoor main pipe through an outdoor branch pipe, and the extraction wells are distributed in the polluted soil or on the periphery of the polluted soil respectively.
6. The in-situ contaminated soil leaching system according to claim 5, wherein the leaching agent extraction unit comprises a controller for controlling a water pump to be turned on or off, a liquid level meter is installed in the extraction well, the liquid level meter and the water pump are both electrically connected with the controller, the liquid level meter is used for monitoring the water level in the extraction well and transmitting water level information to the controller, and the controller is used for controlling the water pump to be turned on or turned off according to the water level information.
7. The in-situ contaminated soil leaching system according to claim 5, wherein each of said external well branches is provided with a section of telescopic joint.
8. The in-situ contaminated soil washing system according to claim 5, wherein said offsite branch pipe is further provided with a check valve and a ball valve, and said offsite branch pipe and offsite main pipe are both provided with flow meters.
9. The in-situ contaminated soil leaching system according to claim 1, wherein the sewage treatment and recycling unit comprises an adjusting tank, a coagulating sedimentation tank and a quartz sand filtering system, the adjusting tank, the coagulating sedimentation tank and the quartz sand filtering system are sequentially communicated along a sewage flow direction, an inlet of the adjusting tank is communicated with the eluent pumping unit and used for receiving sewage discharged by the eluent pumping unit, the quartz sand filtering unit comprises a quartz sand filter and a recycling tank, and the sewage sequentially enters the recycling tank after being purified by the adjusting tank, the coagulating sedimentation tank and the quartz sand filter.
10. The in-situ contaminated soil leaching system according to claim 9, wherein the sewage treatment and recycling unit further comprises a sludge treatment system, the sludge treatment system comprises a sludge tank and a spiral sludge dehydrator which are sequentially communicated, an inlet of the sludge tank is communicated with the coagulating sedimentation tank, and is used for receiving sludge discharged from a sludge hopper of the coagulating sedimentation tank and conveying the sludge to the spiral sludge dehydrator for pressure filtration.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112191676A (en) * | 2020-09-08 | 2021-01-08 | 中冶南方都市环保工程技术股份有限公司 | Contaminated soil in-situ leaching system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112191676A (en) * | 2020-09-08 | 2021-01-08 | 中冶南方都市环保工程技术股份有限公司 | Contaminated soil in-situ leaching system and method |
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