CN105268737B - Heavy metal contaminated soil remediation equipment and remediation process thereof - Google Patents

Heavy metal contaminated soil remediation equipment and remediation process thereof Download PDF

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CN105268737B
CN105268737B CN201510775253.0A CN201510775253A CN105268737B CN 105268737 B CN105268737 B CN 105268737B CN 201510775253 A CN201510775253 A CN 201510775253A CN 105268737 B CN105268737 B CN 105268737B
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soil
washing
slurry
heavy metal
leaching
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CN105268737A (en
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肖远龙
盛国军
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GUANGZHOU FIRST MUNICIPAL ENGINEERING Co.,Ltd.
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Guangzhou First Municipal Engineering Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation

Abstract

The invention relates to heavy metal contaminated soil remediation equipment which comprises a rack, a feed hopper, a crushing roller, a ball mill, a separation sieve, a primary washing tank, a linear vibrating screen, a slurry buffer tank, a slurry pump, a centrifugal machine, a deep washing tank, a belt filter press and a secondary washing tank, wherein contaminated soil is subjected to mechanical grinding, primary washing, primary solid-liquid separation, deep washing, secondary washing and secondary solid-liquid separation for remediation treatment. The invention has advanced process, good treatment effect, high working efficiency and high automation degree.

Description

Heavy metal contaminated soil remediation equipment and remediation process thereof
Technical Field
The invention relates to the field of environment-friendly equipment, in particular to heavy metal contaminated soil remediation equipment capable of effectively treating heavy metal contaminated soil and a remediation process thereof.
Background
Heavy metal pollution in soil mainly comes from untreated emission of waste residues, waste water and waste gas generated by industrial, mining and chemical enterprises, pollution factors mainly comprise lead, arsenic, cadmium, zinc, mercury, copper and the like, and the heavy metal pollution in soil not only influences the quality of agricultural products, but also influences the quality of atmosphere and water environment. Meanwhile, serious soil pollution has become a main factor for restricting sustainable development and utilization of the land in urban areas.
The soil leaching is a physical and chemical remediation technology, and a leaching agent is used for leaching soil to form a more stable complex with heavy metal ions. The heavy metal pollution treatment process is large in quantity and wide in coverage, and the eluent is expensive in proportioning, so that the operation cost is high inevitably due to single elution, the elution effect is poor, secondary pollution is easy to cause, and underground water pollution is easy to cause.
Different leaching conditions and leaching modes have different degrees of repairing the polluted soil and are mainly influenced by factors such as soil conditions, pollutant types, leaching agent types, operation modes and the like. Due to the fact that the geological structure is different from the soil fertility, the heavy metals in the soil are distributed irregularly, and the proper technology is selected, so that the heavy metal content of the soil is effectively reduced, and the energy consumption is very important.
How to effectively and quickly repair the soil polluted by the heavy metals is a difficult problem which is urgently needed to be solved at present. The existing heavy metal contaminated soil remediation treatment adopts simple processes and equipment to carry out simple treatment, and has the defects of backward remediation process, low treatment efficiency, poor effect, large equipment floor area, low automation degree and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides novel heavy metal polluted soil remediation equipment and a remediation process thereof, wherein the novel heavy metal polluted soil remediation equipment is advanced in process, good in treatment effect, high in working efficiency and high in automation degree.
The invention is realized by the following technical scheme:
the utility model provides a heavy metal contaminated soil repair equipment, includes frame, feeder hopper, smashes and rolls, ball mill, separating screen, one-level washing pond, linear vibration sieve, mud buffering pond, sediment stuff pump, centrifuge, degree of depth washing pond, second grade washing pond, frame upper portion is equipped with the feeder hopper, the feeder hopper below is equipped with a pair of crushing roller, it is equipped with the ball mill to smash to roll the below, the ball mill bottom is equipped with the separating screen, the separating screen below is equipped with one-level washing pond, one-level washing pond below is equipped with linear vibration sieve, the linear vibration sieve below is equipped with the mud buffering pond, the mud buffering pond passes through the pipeline, the sediment stuff pump links to each other with centrifuge, the centrifuge below is equipped with degree of depth washing pond, the degree of depth washing pond links.
The repair process of the heavy metal contaminated soil repair equipment comprises the following steps:
s1, soil classification: and (3) carrying out three-dimensional detection on the soil in the contaminated plot area, dividing the soil into heavily contaminated soil, lightly contaminated soil and uncontaminated soil according to the degree of contamination, stacking the heavily contaminated soil and the lightly contaminated soil in a piling manner, crushing and screening the heavily contaminated soil and the lightly contaminated soil, and directly backfilling the uncontaminated soil.
S2, mechanical grinding: the method comprises the steps of carrying out primary crushing and screening on heavily polluted soil and lightly polluted soil respectively, placing the crushed and screened heavily polluted soil and lightly polluted soil into a wet ball mill respectively for mechanical grinding for 30-40min, then discharging and screening, enabling the part above the screen to enter a soil yard, enabling the part below the screen to enter a continuous stirring pool for primary washing, and enabling the lightly polluted soil to directly enter a deep leaching pool without primary washing.
S3, primary water washing: and (8) the heavily polluted soil to be washed after being screened in the step (S2) enters a primary washing tank, clear water is added according to the solid-to-liquid ratio of 1:2-1:4, a stirrer is started, soil and water are fully mixed, the structure of the heavily polluted soil is dispersed, heavy metals on the surface of the heavily polluted soil are desorbed under the action of the water and enter a water body, a gate at the bottom of the primary washing tank is opened after washing for 10-20min, slurry enters a linear vibrating screen, rocks and rock fragments with larger particle sizes on the linear vibrating screen are washed by a high-pressure water gun, the rocks and the rock fragments with larger particle sizes after washing are placed in a primary screening soil stacking area, and the slurry after washing enters a slurry buffer tank.
S4, primary solid-liquid separation: the slurry pump lifts the slurry to an automatic discharge centrifuge, the slurry is dewatered by a high-speed centrifuge, and the generated waste liquid enters a sewage buffer pool.
S5, deep leaching: and (3) conveying the dehydrated soil and slightly polluted soil to a deep leaching tank through a conveyor belt, adding an HSJ-gamma chemical leaching agent, starting a stirrer, fully and uniformly mixing the soil and the leaching agent, opening a valve at the bottom of the deep leaching tank after the reaction is finished, and allowing the slurry to enter a hydraulic cyclone under the action of gravity.
S6, secondary water washing: screening out soil with the particle size of more than 0.075mm by using a debugged hydraulic cyclone, feeding the soil into a secondary washing pool, adding clear water, fully stirring, and carrying out secondary washing; and the part smaller than 0.075mm enters a flocculation sedimentation tank along with the wastewater, and is recycled by eluting agent and clear water.
S7, secondary solid-liquid separation: and (4) performing solid-liquid separation on the slurry subjected to the secondary washing in the step S6, enabling the liquid phase to enter a sewage buffer tank, and enabling the solid phase to enter a soil storage yard for safe disposal.
According to the embodiment of the invention, the invention can be further optimized, and the following is the technical scheme formed after optimization:
step S1, classifying the polluted soil according to the heavy metal pollution degree: the heavy metal contaminants detected include: pb, Zn, Cd, Hg, Cu and metalloid As; the heavily-polluted soil is designed to be soil with the concentration of any one of the six metals exceeding the environmental standard limit value by more than 5 times; the slightly polluted soil is any soil with the concentration between the environmental standard limit value and 5 times of the environmental standard limit value.
S5 the leaching agent HSJ-gamma chemical leaching agent used in the deep leaching is a composite leaching agent, which comprises a synergist and a complexing agent, wherein the synergist is potassium persulfate, hydrogen peroxide and ClO2At least one complexing agent selected from EDTA, thiourea and ethylene glycolAt least one of thiolene.
Preferably, the synergist used in the step S5 is potassium fluosilicate, and the mass ratio of the usage amount of the synergist to the second-stage leached soil is 1: 100-200; the complexing agent is EDTA and ethylene thiourea, and the mass ratio of the dosage of the complexing agent to the second-level soil leaching agent is 1:1: 50-100.
More preferably, the synergist and the complexing agent for the deep leaching in step S5 are added sequentially; adding the synergist, stirring, reacting for 10min, adding the complexing agent, and reacting for 10-15 min.
Preferably, the deep leaching total solid-liquid ratio of the step S5 is 1:3-1: 5; and in the step S6, the mass ratio of the addition of the clear water to the washed soil in the secondary washing is 1:1-2: 1.
In order to solve the technical problems to be solved by the invention, leaching waste liquid in a sewage buffer tank and a flocculation sedimentation tank and heavy metal recovery agents are treated, solid-liquid separation is carried out after the treatment, clear liquid obtained from the sewage buffer tank can be reused for S3 first-level washing, filtrate obtained from the flocculation sedimentation tank can be reused for S5 to be used as a deep leaching agent again, and filter residues are subjected to subsequent resource recovery or hazardous waste landfill.
Compared with the prior art, the invention has the beneficial effects that: the leaching device has compact volume, small occupied area and high automation degree, the efficiency and the effect of the remediation treatment are far higher than those of the existing device, the equipment investment is reduced, the soil remediation cost is reduced, and the labor intensity is reduced. In addition, the invention adopts the advanced processes of firstly crushing and ball milling, secondly washing, secondly separating solid and liquid, and then deeply leaching, so that the repairing efficiency is high and the effect is good. According to the method, the soil is classified according to the pollution degree of the soil, so that the medicament cost and the operation cost are saved, the generation of waste liquid amount is reduced to a certain extent, the amount of solution required by the whole process is lower than that of the traditional slurry leaching, the solid-liquid ratio of the traditional process is reduced to about 1:6 from 1: 8-1: 10, and the total amount of the leaching liquid is reduced by 20-30%. The water in the whole process is recycled after being treated, the waste liquid generated by the secondary leaching can be reused as secondary leaching liquid after being treated by chemical precipitation, and the recycling efficiency can reach about 60 percent, so that part of medicament cost is saved, and secondary pollution to the external environment is avoided.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples.
As shown in figure 1, the heavy metal contaminated soil remediation equipment comprises a frame, a feed hopper, a crushing roller, a ball mill, a separating sieve, a primary water washing pool, a linear vibrating sieve, a slurry buffer pool, a slurry pump, a centrifugal machine, a deep water washing pool and a secondary water washing pool. The frame upper portion is equipped with the feeder hopper, the feeder hopper below is equipped with a pair of crushing and rolls, it is equipped with the ball mill to smash to roll the below. The ball mill bottom is equipped with the separation sieve, the separation sieve below is equipped with one-level washing pond, one-level washing pond below is equipped with linear vibration sieve, the linear vibration sieve below is equipped with the mud buffering pond, the mud buffering pond passes through pipeline, sediment stuff pump and links to each other with centrifuge, the centrifuge below is equipped with the degree of depth washing pond, the degree of depth washing pond passes through the water conservancy swirler and links to each other with belt filter press and the second grade washing pond of below.
Example 1
As shown in fig. 2, the repair process of the heavy metal contaminated soil repair equipment comprises the following steps:
(1) classifying soil: three-dimensional detection is carried out on soil in a lead polluted site, the soil is divided into heavily polluted soil (the average concentration of Pd is 3.182 mg/g), lightly polluted soil (the average concentration of Pd is 1.563 mg/g) and unpolluted soil (the average concentration of Pd is 0.391 mg/g) according to the pollution degree, stacking is carried out in a piling mode, the heavily polluted soil and the lightly polluted soil are crushed and sieved, and the unpolluted soil is directly backfilled.
(2) Mechanical grinding: the method comprises the steps of carrying out primary crushing and screening on the polluted soil, putting the crushed and screened soil into a wet ball mill through a feed hopper for mechanical grinding for 30min, then discharging the soil through a 2mm sieve, enabling the part above the sieve to enter a soil storage yard, and enabling the part below the sieve to be divided into continuous stirring pools for primary washing.
(3) First-stage water washing: the heavily polluted soil sieved in the step S2 enters a first-stage washing tank with the design capacity of 25m3. 2.5m are added by a conveyer belt3Pumping the screened polluted soil from the circulating water tank by a clean water pump according to the solid-to-liquid ratio of 1:3, and adding clean water for 20m3The automatic controller is arranged for water inflow, and the automatic controller automatically stops working after the water reaches a set water level; a high-power high-speed stirring motor in the stirring tank drives a stirrer to fully mix soil and water, the structure of the heavily polluted soil is dispersed, and heavy metals on the surface of the heavily polluted soil are desorbed under the action of water and enter a water body; and (3) opening a gate at the bottom of the primary washing tank after washing for 15min, enabling the slurry to enter a linear vibrating screen (screen mesh particle size is 2 mm), washing rocks and rock fragments with larger particle sizes on the linear vibrating screen by a high-pressure water gun, placing primary screening soil stacking areas for the rocks and rock fragments with larger particle sizes after washing, enabling the washed slurry to enter a slurry buffer tank below, and completing primary washing.
(4) Primary solid-liquid separation: transferring the cleaned soil from the screen to a soil storage yard after the first-stage washing, and enabling the undersize to enter a slurry buffer pool; the slurry pump lifts the slurry to an automatic discharge centrifuge, and the slurry is dewatered by a high-speed centrifuge.
(5) Deep leaching: conveying the dehydrated soil to a deep leaching pond through a conveyor belt; adding 36kg of potassium persulfate into the pond by a metering pump according to the mass ratio of 1:150, and driving a stirrer by a high-power high-speed motor to fully and uniformly mix the soil and the synergist; after the reaction is carried out for 10min, EDTA27.5kg and ethylene thiourea 27.5kg are added into the pool according to the mass ratio of 1:1:200, a valve at the bottom of the deep leaching pool is opened after the reaction is carried out for 10min, and the slurry enters a hydraulic cyclone under the action of gravity.
(6) Secondary water washing: screening out soil with the particle size of more than 0.075mm by using a debugged hydraulic cyclone, feeding the soil into a secondary washing pool, and adding clear water with the particle size of 7.0 m according to the solid-liquid ratio of 1:1.53Fully stirring, and performing secondary washing; and the part smaller than 0.075mm enters a flocculation sedimentation tank along with the wastewater, and is recycled by eluting agent and clear water.
(7) Secondary solid-liquid separation: and after secondary washing, carrying out solid-liquid separation, enabling the liquid phase to enter a sewage buffer tank, recycling the clear liquid after chemical precipitation, and enabling the solid phase to enter a soil yard for safe landfill after detection (the restoration effect is shown in table 1).
Example 2
(1) Classifying soil: three-dimensional detection is carried out on soil in a lead polluted site, the soil is divided into heavily polluted soil (the average concentration of Pd is 3.182 mg/g), lightly polluted soil (the average concentration of Pd is 1.563 mg/g) and unpolluted soil (the average concentration of Pd is 0.391 mg/g) according to the pollution degree, stacking is carried out in a piling mode, the heavily polluted soil and the lightly polluted soil are crushed and sieved, and the unpolluted soil is directly backfilled.
(2) Mechanical grinding: the method comprises the steps of carrying out primary crushing and screening on the polluted soil, putting the crushed and screened soil into a wet ball mill through a feed hopper for mechanical grinding for 30min, then discharging the soil through a 2mm sieve, enabling the part above the sieve to enter a soil storage yard, and enabling the part below the sieve to be divided into continuous stirring pools for primary washing.
(3) First-stage water washing: the heavily polluted soil sieved in the step S2 enters a first-stage washing tank with the design capacity of 25m3. 2.0m addition by conveyor3Pumping the screened polluted soil from the circulating water tank by a clean water pump according to the solid-liquid ratio of 1:4, and adding 21.5m of clean water3The automatic controller is arranged for water inflow, and the automatic controller automatically stops working after the water reaches a set water level; the gate at the bottom of the primary washing tank is opened after the high-power motor is used for stirring and washing for 20min, the slurry enters a linear vibrating screen (screen mesh particle size is 2 mm), rocks and rock fragments with larger particle sizes on the linear vibrating screen are washed by a high-pressure water gun, the rocks and rock fragments with larger particle sizes after washing are placed in a primary screening soil stacking area, and the slurry after washing enters a slurry buffer tank below the primary washing tank to complete primary washing.
(4) Primary solid-liquid separation: transferring the cleaned soil from the screen to a soil storage yard after the first-stage washing, and enabling the undersize to enter a slurry buffer pool; the slurry pump lifts the slurry to an automatic discharge centrifuge, and the slurry is dewatered by a high-speed centrifuge.
(5) Deep leaching, namely conveying the dehydrated soil to a deep leaching tank through a conveyor belt, adding 30% hydrogen peroxide 40L into the tank by a metering pump according to the mass ratio of 1:100, driving a stirrer by a high-power high-speed motor to fully and uniformly mix the soil and a synergist, reacting for 10min, adding EDTA57kg and ethylene thiourea 57kg into the tank according to the mass ratio of 1:1:75 as a complexing agent, reacting for 10min, opening a valve at the bottom of the deep leaching tank, and allowing the slurry to enter a hydraulic cyclone under the action of gravity.
(6) Secondary water washing: screening out soil with the particle size of more than 0.075mm by using a debugged hydraulic cyclone, feeding the soil into a secondary washing pool, and adding clear water with the particle size of 7.5 m according to the solid-liquid ratio of 1:23Fully stirring, and performing secondary washing; and the part smaller than 0.075mm enters a flocculation sedimentation tank along with the wastewater, and is recycled by eluting agent and clear water.
(7) Secondary solid-liquid separation: and after secondary washing, carrying out solid-liquid separation, enabling the liquid phase to enter a sewage buffer tank, recycling the clear liquid after chemical precipitation, and enabling the solid phase to enter a soil yard for safe landfill after detection (the restoration effect is shown in table 1).
Example 3
(1) Classifying soil: three-dimensional detection is carried out on soil in a lead polluted site, the soil is divided into heavily polluted soil (the average concentration of Pd is 3.182 mg/g), lightly polluted soil (the average concentration of Pd is 1.563 mg/g) and unpolluted soil (the average concentration of Pd is 0.391 mg/g) according to the pollution degree, stacking is carried out in a piling mode, the heavily polluted soil and the lightly polluted soil are crushed and sieved, and the unpolluted soil is directly backfilled.
(2) Mechanical grinding: the method comprises the steps of carrying out primary crushing and screening on the polluted soil, putting the crushed and screened soil into a wet ball mill through a feed hopper for mechanical grinding for 30min, then discharging the soil through a 2mm sieve, enabling the part above the sieve to enter a soil storage yard, and enabling the part below the sieve to be divided into continuous stirring pools for primary washing.
(3) First-stage water washing: the heavily polluted soil sieved in the step S2 enters a first-stage washing tank with the design capacity of 25m3. 2.0m addition by conveyor3Pumping the screened polluted soil from the circulating water tank by a clean water pump according to the solid-liquid ratio of 1:3.5, and adding clean water for 19m3The automatic controller is arranged for water inflow, and the automatic controller automatically stops working after the water reaches a set water level; after the high-power motor is stirred and leached for 20min, the bottom gate of the first-stage washing tank is opened, the slurry enters a linear vibrating screen (the grain diameter of a screen hole is 2 mm), and the slurry is linearly vibratedAnd (3) flushing the rocks and rock fragments with larger particle sizes on the screen by a high-pressure water gun, placing a primary screening soil stacking area for the rocks and rock fragments with larger particle sizes after flushing, and enabling the flushed slurry to enter a slurry buffer pool below to finish primary washing.
(4) Primary solid-liquid separation: transferring the cleaned soil from the screen to a soil storage yard after the first-stage washing, and enabling the undersize to enter a slurry buffer pool; the slurry pump lifts the slurry to an automatic discharge centrifuge, and the slurry is dewatered by a high-speed centrifuge.
(5) Deep leaching: conveying the dehydrated soil to a deep leaching pond through a conveyor belt; 22kg of potassium persulfate is added into the pond by a metering pump according to the mass ratio of 1:200, and a high-power high-speed motor drives a stirrer to fully and uniformly mix the soil and the synergist; after reacting for 15min, adding EDTA86kg and ethylene thiourea 103kg into the tank according to the mass ratio of 1:1.2:50, opening a valve at the bottom of the deep leaching tank after reacting for 15min, and feeding the slurry into a hydraulic cyclone under the action of gravity.
(6) Secondary water washing: screening out soil with the particle size of more than 0.075mm by using a debugged hydraulic cyclone, feeding the soil into a secondary washing pool, adding clear water according to the solid-to-liquid ratio of 1:1 and the particle size of 3.5 m3Fully stirring, and performing secondary washing; and the part smaller than 0.075mm enters a flocculation sedimentation tank along with the wastewater, and is recycled by eluting agent and clear water.
(7) Secondary solid-liquid separation: and after secondary washing, carrying out solid-liquid separation, enabling the liquid phase to enter a sewage buffer tank, recycling the clear liquid after chemical precipitation, and enabling the solid phase to enter a soil yard for safe landfill after detection (the restoration effect is shown in table 1).
The soil remediation effects of the present invention are shown in the following table:
TABLE 1 soil remediation Effect of the examples of the invention
TABLE 2 surface water and Sewage discharge Standard (Pb)
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.

Claims (7)

1. A treatment process of heavy metal contaminated soil remediation equipment is characterized by comprising the following steps: it comprises the following steps:
s1, soil classification: three-dimensional detection is carried out on the soil in the contaminated plot area, the soil is divided into heavily contaminated soil, lightly contaminated soil and uncontaminated soil according to the degree of contamination, the heavily contaminated soil and the lightly contaminated soil are piled up in a piling mode, the heavily contaminated soil and the lightly contaminated soil are crushed and screened, and the uncontaminated soil is directly backfilled;
s2, mechanical grinding: primarily crushing and screening heavily polluted soil and lightly polluted soil, respectively placing the crushed and screened heavily polluted soil and lightly polluted soil into a wet ball mill for mechanical grinding for 30-40min, then discharging and screening, enabling the part above a screen to enter a soil yard, enabling the part below the screen to enter a continuous stirring pool for primary washing, and directly enabling the lightly polluted soil to enter a deep leaching pool without primary washing;
s3, primary water washing: s2, enabling the heavily polluted soil to be washed after being screened to enter a first-stage washing tank, adding clear water according to a solid-to-liquid ratio of 1:2-1:4, starting a stirrer to fully mix soil and water, dispersing the structure of the heavily polluted soil, desorbing heavy metals on the surface of the heavily polluted soil into a water body under the action of water, washing for 10-20min, opening a gate at the bottom of the first-stage washing tank, enabling slurry to enter a linear vibrating screen, washing rocks and rock fragments with larger particle sizes on the linear vibrating screen by a high-pressure water gun, placing the rocks and rock fragments with larger particle sizes after being washed in a first-stage screening soil stacking area, and enabling the slurry after being washed to enter a slurry buffer tank below the first-stage;
s4, primary solid-liquid separation: the slurry pump lifts the slurry to an automatic discharge centrifuge, the slurry is dewatered by a high-speed centrifuge, and the generated waste liquid enters a sewage buffer pool;
s5, deep leaching: conveying the dehydrated soil and slightly polluted soil to a deep leaching tank through a conveyor belt, adding an HSJ-gamma chemical leaching agent, starting a stirrer, fully and uniformly mixing the soil and the leaching agent, opening a valve at the bottom of the deep leaching tank after the reaction is finished, and allowing slurry to enter a hydraulic cyclone under the action of gravity;
s6, secondary water washing: screening out soil with the particle size of more than 0.075mm by using a debugged hydraulic cyclone, feeding the soil into a secondary washing pool, adding clear water, fully stirring, and carrying out secondary washing; the part smaller than 0.075mm enters a flocculation sedimentation tank along with the wastewater, and the eluent is recycled and the clear water is reused;
s7, secondary solid-liquid separation: and (4) performing solid-liquid separation on the slurry subjected to the secondary washing in the step S6, enabling the liquid phase to enter a sewage buffer tank, and enabling the solid phase to enter a soil storage yard for safe disposal.
2. The treatment process of the heavy metal contaminated soil remediation device according to claim 1, wherein the heavy metal contaminants detected in step S1 include: pb, Zn, Cd, Hg, Cu and metalloid As; the heavily-polluted soil is designed to be the soil with the concentration of any one of the six metals exceeding the environmental standard limit value by 5 times.
3. The treatment process of the heavy metal contaminated soil remediation device according to claim 1, wherein the eluent HSJ-gamma chemical eluent used in the deep elution in the step S5 is a composite eluent comprising a synergist and a complexing agent, wherein the synergist is potassium persulfate, hydrogen peroxide and ClO2At least one complexing agent is at least one of EDTA, thiourea and ethylene thiourea.
4. The treatment process of the heavy metal contaminated soil remediation equipment according to claim 3, wherein the synergist in the composite eluting agent used in the deep eluting of step S5 is potassium persulfate, and the mass ratio of the usage amount of the synergist to the secondary eluted soil is 1: 100-200; the complexing agent is EDTA and ethylene thiourea, and the mass ratio of the dosage of the complexing agent to the second-level soil leaching agent is 1:1: 50-100.
5. The treatment process of heavy metal contaminated soil remediation equipment according to claim 1, wherein in step S6, the waste liquid in the flocculation sedimentation tank is treated with a leaching waste liquid recovery treatment agent to treat heavy metals, after treatment, solid-liquid separation is performed, the filtrate is returned to step S5 to be used as a deep leaching agent again, and the filter residue is subjected to subsequent resource recovery or hazardous waste landfill.
6. The treatment process of the heavy metal contaminated soil remediation device according to claim 1, wherein the eluent used in the step S5 of deep leaching is a composite eluent comprising a synergist and a complexing agent, wherein the synergist and the complexing agent are added sequentially; adding the synergist, stirring, reacting for 10min, adding the complexing agent, and reacting for 10-15 min.
7. The treatment process of the heavy metal contaminated soil remediation device according to claim 1, wherein the step S5 of deep leaching is performed with a total solid-liquid ratio of 1:3 to 1: 5; and in the step S6, the mass ratio of the addition of the clear water to the washed soil in the secondary washing is 1:1-2: 1.
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