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Elution-adsorption repair method for hexavalent chromium contaminated soil

A repair method, the technology of hexavalent chromium, which is applied in the field of leaching-adsorption repair of hexavalent chromium-contaminated soil, can solve the problems of high cost of chemical reagents, secondary soil pollution, etc., achieve high removal rate, simple operation, and reduce costs Effect

Inactive Publication Date: 2017-01-25
天津北洋百川生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical leaching method can repair heavily chromium-contaminated soil to a certain extent, the chemical leaching method generally uses chemical reagents for leaching, which causes secondary pollution of the soil, and at the same time, the chemical reagents have the disadvantage of high cost.

Method used

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  • Elution-adsorption repair method for hexavalent chromium contaminated soil
  • Elution-adsorption repair method for hexavalent chromium contaminated soil
  • Elution-adsorption repair method for hexavalent chromium contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of polyglutamic acid-polylysine-tannic acid gel:

[0024] ① Prepare 100mL of 1g / L γ-polyglutamic acid solution, place it on a magnetic stirrer and stir evenly until completely dissolved;

[0025] ② Prepare 100mL of 4g / L tannic acid solution, place on a magnetic stirrer and stir until completely dissolved;

[0026] ③Mix the above-mentioned completely dissolved γ-polyglutamic acid solution and tannic acid solution according to the volume ratio of 1:5 and stir continuously, add 4.0g of ε-polylysine powder until no gel is produced, and stop stirring ;

[0027] ④Take out the gel and serve.

[0028] Leaching-Adsorption Remediation of Hexavalent Chromium Contaminated Soil Next to Hunan Chromium Mine

[0029] 1. Rinse

[0030] The hexavalent chromium-contaminated soil next to the Hunan chrome mine was injected into the polluted soil with 5 tons of water through the injection well for leaching, and then the eluate enriched with hexavalent chromium ions was collec...

Embodiment 2

[0036] Preparation of polyglutamic acid-polylysine-tannic acid gel:

[0037] With embodiment 1;

[0038] Leaching-Adsorption Remediation of Hexavalent Chromium Contaminated Soil Next to Hunan Chromium Mine

[0039] 1. Rinse

[0040] The hexavalent chromium-contaminated soil next to the chrome mine in Shanxi is injected into the contaminated soil with 5 tons of water through the injection well for leaching, and then the eluent enriched with hexavalent chromium ions is collected through the extraction well, and the supernatant is extracted after settling liquid into the treatment tank;

[0041] 2. Adsorption

[0042] Add 30kg / ton of polyglutamic acid-polylysine-tannic acid gel to the treatment tank for adsorption treatment, stir and adsorb for 3 hours, pump the filtrate to the injection well after filtration and continue to wash the soil, repeat the above steps The soil was rinsed 5 times, and the polyglutamic acid-polylysine-tannic acid gel continued to be used after desorp...

Embodiment 3

[0046] Preparation of polyglutamic acid-polylysine-tannic acid gel:

[0047] With embodiment 1;

[0048] 1. Leaching-adsorption repairing leaching of hexavalent chromium contaminated soil next to Hubei chrome mine

[0049] The hexavalent chromium-contaminated soil next to the Hubei chrome mine was injected into the contaminated soil through an injection well with 5 tons of water for leaching, and then the eluate enriched with hexavalent chromium ions was collected through an extraction well, and the supernatant was extracted after settling to the treatment tank;

[0050] 2. Adsorption

[0051] Add 30kg / ton of polyglutamic acid-polylysine-tannic acid gel to the treatment tank for adsorption treatment, stir and adsorb for 3 hours, pump the filtrate to the injection well after filtration and continue to wash the soil, repeat the above steps The soil was rinsed 5 times, and the polyglutamic acid-polylysine-tannic acid gel continued to be used after desorption treatment.

[005...

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Abstract

The invention discloses a repair method for hexavalent chromium contaminated soil. The repair method includes steps of (1), injecting water into the hexavalent chromium contaminated soil via an injection well, collecting eluting solution with enriched hexavalent chromium ions via an extraction well, carrying out sedimentation on the eluting solution and extracting supernatant into a treatment tank; (2), adding polyglutamic acid-polylysine-tannic acid gel into the treatment tank, carrying out adsorption treatment on the polyglutamic acid-polylysine-tannic acid gel, stirring and adsorbing the polyglutamic acid-polylysine-tannic acid gel for 3 hours, filtering the polyglutamic acid-polylysine-tannic acid gel, pumping filtrate into the injection well, continuing to elute the soil and reusing the polyglutamic acid-polylysine-tannic acid gel after adsorption treatment is carried out on the polyglutamic acid-polylysine-tannic acid gel. The water is used as an eluting agent. The repair method has the advantages that the hexavalent chromium ions in the soil can be removed efficiently, secondary environmental pollution can be prevented, biological high-polymer materials are biodegradable and biocompatible, the repair method can be widely applied to the field of environment protection, and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a leaching-adsorption restoration method for hexavalent chromium polluted soil. Background technique [0002] With the rise of chromium ore mining, smelting, chromium salt manufacture, metal processing, tanning, printing and dyeing and other industries, chromium has become an important heavy metal pollution element in the environment, and the health hazards of soil polluted by chromium are mainly six Hexavalent chromium is 100 times more harmful to health than trivalent chromium. Chromium slag pollution has been reported in more than 20 provinces and cities across the country. Hexavalent chromium is easily soluble in water, so it is easy to enter crops through the soil and endanger the health of residents. Chromium accumulates in the body and affects the oxidation-reduction process and hydrolysis process in the body. The combination of chromium and protein can inh...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B09C1/02C02F1/28C02F101/22
CPCB01J20/265B01J20/28047B09C1/02C02F1/285C02F2101/22
Inventor 乔长晟孙雨张卫
Owner 天津北洋百川生物技术有限公司
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