CN112718838A - Leaching system and process for high-concentration copper-polluted soil - Google Patents
Leaching system and process for high-concentration copper-polluted soil Download PDFInfo
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- CN112718838A CN112718838A CN202011312331.0A CN202011312331A CN112718838A CN 112718838 A CN112718838 A CN 112718838A CN 202011312331 A CN202011312331 A CN 202011312331A CN 112718838 A CN112718838 A CN 112718838A
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- 238000002386 leaching Methods 0.000 title claims abstract description 80
- 239000002689 soil Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims description 19
- 230000003647 oxidation Effects 0.000 claims abstract description 68
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 68
- 239000002002 slurry Substances 0.000 claims abstract description 60
- 230000008719 thickening Effects 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000005086 pumping Methods 0.000 claims abstract description 36
- 239000010949 copper Substances 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052802 copper Inorganic materials 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000006228 supernatant Substances 0.000 claims abstract description 18
- 238000001802 infusion Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000007800 oxidant agent Substances 0.000 claims description 16
- 230000001590 oxidative effect Effects 0.000 claims description 14
- 150000007524 organic acids Chemical class 0.000 claims description 12
- 238000005345 coagulation Methods 0.000 claims description 11
- 230000015271 coagulation Effects 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- 239000012190 activator Substances 0.000 claims description 10
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- 239000000701 coagulant Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 2
- 239000003480 eluent Substances 0.000 claims 1
- 238000005188 flotation Methods 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000005067 remediation Methods 0.000 description 6
- 238000004065 wastewater treatment Methods 0.000 description 5
- 238000012216 screening Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
Abstract
The invention relates to a leaching system for high-concentration copper polluted soil, which comprises a slurry oxidation tank, a primary thickening tank, a leaching and stirring tank, a secondary thickening tank and a plate-and-frame filter press which are sequentially communicated; a first pumping and conveying infusion pipeline is arranged at the high position of the wall of the primary thickening tank and used for pumping supernatant liquid to the slurry oxidation tank; and a second pumping and conveying infusion pipeline is respectively arranged at the high position of the wall of the secondary thickening tank and the water outlet of the plate-and-frame filter press, the second pumping and conveying infusion pipeline is used for pumping supernatant and filter pressing liquid to the mud oxidation tank or the leaching and stirring tank, and a feed inlet for replenishing the leaching agent is arranged on the second pumping and conveying infusion pipeline. The invention has the advantages of providing a set of complete new technology suitable for a leaching and sewage recycling system of the high-concentration heavy metal contaminated soil, effectively reducing the content of copper in the soil and restoring the contaminated soil.
Description
Technical Field
The invention relates to the field of heavy metal contaminated soil treatment, in particular to a leaching system and method for high-concentration copper contaminated soil.
Background
In recent years, soil pollution remediation is closely concerned and strongly supported, soil protection policies such as 'ten pieces of soil' are issued one after another, and each unit has remediation difficulties in many practical projects while strengthening soil remediation. Copper is one of typical heavy metal pollution in soil, copper-containing mining, three-waste discharge of smelteries, use of copper-containing bactericides, agriculture of excess sludge and the like can enable the content of copper in the soil to be dozens of times of that of original soil.
Chemical leaching is one of the common means for soil remediation, has the advantages of thorough removal, economy and rapidness, and is widely researched and applied. However, the existing soil remediation starts late, and the remediation level is uneven. The research on the heavy metal soil with higher pollution concentration is relatively less.
For polluted soil with lower overproof degree, the traditional leaching method such as EDTA leaching or green leaching agent citric acid leaching is easier to be adopted; for polluted soil with high overproof degree, the pollutants are difficult to remove by simply increasing the concentration, liquid-solid ratio or leaching time of the leaching agent, and the corresponding requirements of the land utilization standard cannot be met. Copper is easy to remove at a lower concentration of about 2000mg/kg, but at a high concentration of, for example, 8000-10000mg/kg, the copper is not obviously removed by the traditional single leaching, and the multi-stage leaching based on the copper is difficult to effectively remove, thereby bringing great difficulty to the actual engineering. If the waste is treated as hazardous waste, the cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and solve the problem of repairing the high-concentration copper-polluted soil.
In order to achieve the aim, the invention provides a leaching system for high-concentration copper polluted soil, which comprises a slurry oxidation tank, a primary thickening tank, a leaching stirring tank, a secondary thickening tank and a plate-and-frame filter press which are sequentially communicated; a first pumping and conveying infusion pipeline is arranged at the high position of the wall of the primary thickening tank and used for pumping supernatant liquid to the slurry oxidation tank; and a second pumping and conveying infusion pipeline is respectively arranged at the high position of the wall of the secondary thickening tank and the water outlet of the plate-and-frame filter press, the second pumping and conveying infusion pipeline is used for pumping supernatant and filter pressing liquid to the mud oxidation tank or the leaching and stirring tank, and a feed inlet for replenishing the leaching agent is arranged on the second pumping and conveying infusion pipeline.
The slurry oxidation tank utilizes an oxidant to remove a high-content organic matter reaction part in the soil, so that the adsorption effect on copper is reduced; the leaching and stirring tank uses the leaching agent to complex most of the copper in the weak adsorption state in the soil so as to separate the copper from the soil. And the reasonable arrangement of the circulating water can improve the utilization rate of water resources and reduce the usage amount of related feeding materials.
Preferably, the liquid collected by the second pumping and conveying liquid conveying pipeline is purified and then output by the air floatation tank, the oxidation tank and the coagulation tank in sequence.
Because the impurity content of the supernatant discharged from the second-stage thickening tank is low, the supernatant can also be directly discharged to the leaching stirring tank for leaching, and the operation efficiency is improved.
Preferably, the oxidation tank oxidizes the liquid in the oxidation tank by a fenton oxidation method, and the coagulation tank coagulates the liquid in the coagulation tank by adding a PAC coagulant.
The leaching process of the high-concentration copper-polluted soil is also provided, and the leaching system of the high-concentration copper-polluted soil is adopted, and comprises the following steps:
the first step is as follows: introducing and storing the high-concentration copper polluted soil into the slurry oxidation tank, and adding an oxidant and an activator to carry out oxidation pretreatment;
the second step is that: inputting the pretreated slurry in the slurry oxidation tank into the primary thickening tank for solid-liquid separation; pumping the supernatant liquid after solid-liquid separation back to the slurry oxidation tank, and conveying the lower layer slurry into the leaching stirring tank;
the third step: adding an organic acid eluting agent into the slurry in the eluting and stirring tank for chemical eluting, and after full reaction, transporting the slurry into the secondary thickening tank;
the fourth step: monitoring the pH value of the slurry in the secondary thickening tank, and adding alkali liquor into the secondary thickening tank to enable the pH value of the slurry to be neutral;
the fifth step: carrying out solid-liquid separation on the slurry in the secondary thickening tank; pumping the separated supernatant liquid back to the leaching stirring tank; inputting the lower layer slurry into the plate-and-frame filter press for dehydration;
and a sixth step: the filtrate output by the plate-and-frame filter press is conveyed back to the mud oxidation tank or the leaching and stirring tank; and the filter residue is the repaired soil, and is maintained and backfilled.
And the secondary thickening tank can be often provided with a pH detector and an outlet of alkali liquor dosing equipment.
Preferably, the duration of the oxidation pretreatment in the mud oxidation tank is 15 to 30 minutes, and the duration of the chemical leaching in the leaching stirring tank is 2 to 3 hours.
Preferably, the oxidizing agent of the slurry oxidation tank is sodium persulfate, the activating agent is citric acid chelated iron, and the organic acid eluting agent of the eluting and stirring tank is citric acid.
Preferably, the mass concentration range of sodium persulfate of the oxidant of the slurry oxidation pond is 1-4%, the mass concentration range of citric acid chelated iron of the activator is 1.2-1.5%, and the citric acid concentration range of the organic acid eluting agent is 0.1-0.5 mol/L.
Preferably, the high-concentration copper polluted soil is mechanically screened before being introduced, and the screening diameter is set to be 0.15 mm.
The invention has the advantages that a set of complete new process suitable for a leaching and sewage recycling system of the high-concentration heavy metal contaminated soil is provided, and the content of copper in the soil can be effectively reduced, so that the contaminated soil is repaired; because the leaching process can theoretically reduce other heavy metals while removing copper, such as: the content of Pb can be used for leaching and repairing the high-concentration copper polluted soil, and can also be used for leaching and repairing other heavy metals or organic-heavy metal combined pollution.
Drawings
FIG. 1 is a schematic view of the leaching system for high concentration copper contaminated soil of the present invention;
wherein:
1-slurry oxidation tank 2-first-stage thickening tank 3-leaching stirring tank
4-two-stage thickening tank 5-plate and frame filter press 6-pH detector
7-alkali liquor dosing equipment 8-wastewater treatment equipment
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
The leaching system for the high-concentration copper polluted soil shown in the figure 1 comprises a slurry oxidation tank 1, a primary thickening tank 2, a leaching stirring tank 3, a secondary thickening tank 4 and a plate-and-frame filter press 5 which are sequentially communicated; a first pumping and conveying liquid conveying pipeline is arranged at the high position of the wall of the primary thickening tank 2 and used for pumping supernatant liquid to the slurry oxidation tank 1; a second pumping and transfusion pipeline is respectively arranged at the high position of the wall of the secondary thickening tank 4 and the water outlet of the plate-and-frame filter press 5, and a pH detector 6 and an outlet of alkali liquor dosing equipment 7 are arranged in the secondary thickening tank 4; the second pumping and conveying pipeline is used for pumping supernatant and filtrate to the mud oxidation tank 1 or the leaching and stirring tank 3, and can also be used for conveying the mud oxidation tank 1 and the leaching and stirring tank 3 at the same time; and the liquid collected by the second pumping and conveying liquid conveying pipeline is purified and then output by the air floatation tank, the oxidation tank and the coagulation tank in sequence. And a feed port for supplementing the eluting agent is also arranged on the second pumping and conveying pipeline from the coagulation tank to the eluting and stirring tank 3.
The oxidation pond oxidizes the liquid in the oxidation pond by a Fenton oxidation method, and the coagulation pond coagulates the liquid in the coagulation pond by adding a PAC coagulant.
The leaching process of the leaching system comprises the following steps:
the high-concentration copper polluted soil is subjected to mechanical screening pretreatment before being introduced into the slurry oxidation pond 1, and the screening diameter is set to be 0.15 mm.
The first step is as follows: introducing and storing the high-concentration copper polluted soil into the slurry oxidation pond 1, and adding an oxidant and an activator to carry out oxidation pretreatment;
the second step is that: inputting the pretreated slurry in the slurry oxidation tank 1 into the primary thickening tank 2 for solid-liquid separation; pumping the supernatant liquid after solid-liquid separation back to the slurry oxidation tank 1, and conveying the lower layer slurry into the leaching stirring tank 3;
the third step: adding an organic acid eluting agent into the slurry in the eluting and stirring tank 3 for chemical eluting, stirring and fully reacting, and then transporting the slurry into the secondary thickening tank 4;
the fourth step: while monitoring the pH value of the slurry in the secondary thickening tank 4, adding alkali liquor into the secondary thickening tank 4 to enable the pH value of the slurry to be neutral;
the fifth step: carrying out solid-liquid separation on the slurry in the secondary thickening tank 4; pumping the separated supernatant liquid back to the leaching stirring tank 3; the lower layer slurry is input into the plate-and-frame filter press 5 for dehydration;
and a sixth step: the filtrate output by the plate and frame filter press 5 is conveyed back to the mud oxidation tank 1 or the leaching and stirring tank 3; and the filter residue is the repaired soil, and is maintained and backfilled.
The duration of the oxidation pretreatment in the mud oxidation pond 1 is 15-30 minutes, and the duration of the chemical leaching in the leaching stirring pond 3 is 2-3 hours. The oxidizing agent of the mud oxidation tank is sodium persulfate, the activating agent is citric acid chelated iron, and the organic acid eluting agent of the eluting and stirring tank is citric acid. The mass concentration range of sodium persulfate of the oxidant of the slurry oxidation pond is 1-4%, the mass concentration range of citric acid chelated iron of the activator is 1.2-1.5%, and the citric acid concentration range of the organic acid eluting agent is 0.1-0.5 mol/L.
In an actual experimental example, the high-concentration copper polluted soil in an area is leached by adopting the high-concentration copper polluted soil leaching system and the high-concentration copper polluted soil leaching process.
Parameters of the contaminated soil (N1, N2, N3 measured 1, 2, 3 times, respectively) (mg/kg)
The treatment system for the high-concentration copper-polluted soil comprises a slurry oxidation tank 1, a first-stage thickening tank 2, a leaching stirring tank 3, a second-stage thickening tank 4, a plate-and-frame filter press 5 and a pumping and conveying infusion pipeline containing wastewater treatment equipment 8, wherein the slurry oxidation tank 1, the first-stage thickening tank 2, the leaching stirring tank 3, the second-stage thickening tank 4 and the plate-and-frame filter press 5 are sequentially communicated through pipeline transportation. The pumping and conveying liquid conveying pipeline is a plurality of pipelines and is used for guiding the effluent of the first-stage thickening tank 2, the second-stage thickening tank 4 and the plate-and-frame filter press 5 and guiding proper liquid back to the mud oxidation tank 1 and the leaching and stirring tank 3. An p H detector 6 and an outlet of an alkali liquor dosing device 7 are arranged in the secondary thickening tank 4.
The pre-screened diameter of the soil was 0.15 mm. The volume ratio of the slurry oxidation tank 1 to the leaching stirring tank 3 is 1:3, the added medicaments are respectively an oxidant sodium persulfate (containing activator citric acid chelated iron) and leaching agent citric acid, the mass concentration of the oxidant sodium persulfate of the slurry oxidation tank 1 is 4% (the mass concentration is controlled to be 1% -4% when the oxidant is added for multiple times), the mass concentration of the citrate chelated iron of the activator is 1.5% (the mass concentration is controlled to be 1.2-1.5% when the oxidant is added for multiple times), and the concentration of the citric acid of the organic acid leaching agent is 0.5mol/L (the concentration range is maintained to be 0.1-0.5 mol/L when the oxidant is added for multiple times). The volume ratio of the first-stage thickening tank 2 to the second-stage thickening tank 4 is 1: 2. the wastewater treatment equipment 8 for pumping the infusion pipeline consists of an air floatation tank, an oxidation tank and a coagulation tank, wherein the oxidation tank adopts Fenton oxidation, and the coagulation tank adopts PAC coagulant.
The specific leaching process comprises the following steps:
the first step is as follows: high-concentration copper polluted soil is poured into the slurry oxidation tank 1 and stored, and an oxidant and an activator are added for oxidation treatment; the oxidation time is 15-30 min;
the second step is that: performing solid-liquid separation on the slurry subjected to oxidation pretreatment in a primary thickening tank 2, recycling the supernatant to a slurry oxidation tank 1, and conveying the lower layer slurry to a leaching and stirring tank 3;
the third step: adding an organic acid eluting agent into the slurry in the eluting and stirring tank 3 for chemical elution, fully reacting for 2-3h, and then conveying the slurry into a second-stage thickening tank 4 for solid-liquid separation;
the fourth step: the supernatant part separated by the second-stage thickening tank 4 is partially treated and supplemented with an organic acid eluting agent through a wastewater treatment device 8 so as to be recycled to the eluting and stirring tank 3, and the part is recycled to the slurry oxidation tank 1; the lower layer slurry is dehydrated by a plate-and-frame filter press 2, and the filter press liquid is transported back to the wastewater treatment equipment 8 for treatment. The obtained filter residue is the repaired soil, and can be maintained and backfilled.
The application result is as follows:
detection value (mg/kg) of each pollutant in the leached soil
In conclusion, after the system and the method are adopted, the Cu in the experimental soil is reduced from 7952mg/kg to 2500mg/kg, the removal rate is 69%, and the effective removal of high-concentration Cu is realized. Further, Pb was partially removed, which was 25%.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of numerous equivalents and substitutions, all of which are within the scope of the invention as defined by the appended claims.
Claims (8)
1. A leaching system for high-concentration copper polluted soil is characterized by comprising a slurry oxidation tank, a first-stage thickening tank, a leaching stirring tank, a second-stage thickening tank and a plate-and-frame filter press which are sequentially communicated; a first pumping and conveying infusion pipeline is arranged at the high position of the wall of the primary thickening tank and used for pumping supernatant liquid to the slurry oxidation tank; and a second pumping and conveying infusion pipeline is respectively arranged at the high position of the wall of the secondary thickening tank and the water outlet of the plate-and-frame filter press, the second pumping and conveying infusion pipeline is used for pumping supernatant and filter pressing liquid to the mud oxidation tank or the leaching and stirring tank, and a feed inlet for replenishing the leaching agent is arranged on the second pumping and conveying infusion pipeline.
2. The leaching system according to claim 1, wherein the liquid collected by the second pumping and conveying pipeline is purified and output sequentially through the air flotation tank, the oxidation tank and the coagulation tank.
3. The leaching system according to claim 2, wherein the oxidation basin oxidizes the liquid therein by fenton oxidation and the coagulation basin coagulates the liquid therein by feeding a PAC coagulant.
4. The leaching process of the high-concentration copper-polluted soil is characterized in that the leaching system of claim 1 is adopted, and the leaching process comprises the following steps:
the first step is as follows: introducing and storing the high-concentration copper polluted soil into the slurry oxidation tank, and adding an oxidant and an activator to carry out oxidation pretreatment;
the second step is that: inputting the pretreated slurry in the slurry oxidation tank into the primary thickening tank for solid-liquid separation; pumping the supernatant liquid after solid-liquid separation back to the slurry oxidation tank, and conveying the lower layer slurry into the leaching stirring tank;
the third step: adding an organic acid eluting agent into the slurry in the eluting and stirring tank for chemical eluting, and after full reaction, transporting the slurry into the secondary thickening tank;
the fourth step: monitoring the pH value of the slurry in the secondary thickening tank, and adding alkali liquor into the secondary thickening tank to enable the pH value of the slurry to be neutral;
the fifth step: carrying out solid-liquid separation on the slurry in the secondary thickening tank; pumping the separated supernatant liquid back to the leaching stirring tank; inputting the lower layer slurry into the plate-and-frame filter press for dehydration;
and a sixth step: the filtrate output by the plate-and-frame filter press is conveyed back to the mud oxidation tank or the leaching and stirring tank; and the filter residue is the repaired soil, and is maintained and backfilled.
5. The leaching process according to claim 4, wherein the duration of the oxidation pretreatment in the sludge oxidation tank is 15 to 30 minutes, and the duration of the chemical leaching in the leaching agitation tank is 2 to 3 hours.
6. The leaching process according to claim 4, wherein the oxidant of the mud oxidation pond is sodium persulfate, the activator is citric acid chelated iron, and the organic acid eluent of the leaching agitation pond is citric acid.
7. The leaching process according to claim 6, wherein the mass concentration of sodium persulfate of the oxidant in the slurry oxidation pond is in a range of 1-4%, the mass concentration of citric acid chelated iron of the activator is in a range of 1.2-1.5%, and the citric acid concentration of the organic acid leaching agent in the leaching stirring pond is in a range of 0.1-0.5 mol/L.
8. The leaching process according to claim 4, wherein the high concentration copper contaminated soil is mechanically screened to a screen diameter of 0.15mm prior to introduction.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351638A (en) * | 2021-06-10 | 2021-09-07 | 上海城投上境生态修复科技有限公司 | Leaching system and process for petroleum hydrocarbon and heavy metal contaminated soil |
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