Method for combined remediation of heavy metal contaminated soil through curing agent and microorganisms

A technology of combined restoration of contaminated soil, applied in the restoration of contaminated soil, etc., can solve the problems of easy death of microorganisms, achieve the effect of reducing the dissolution rate, reducing the concentration of leaching, and inhibiting cadmium pollution

Active Publication Date: 2018-11-13
四川川能环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the above-mentioned toxic effect of heavy metal pollutants on microorganisms leads to the death of mi

Method used

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  • Method for combined remediation of heavy metal contaminated soil through curing agent and microorganisms
  • Method for combined remediation of heavy metal contaminated soil through curing agent and microorganisms
  • Method for combined remediation of heavy metal contaminated soil through curing agent and microorganisms

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Experimental program
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Effect test

Embodiment 1

[0029] A kind of solidifying agent and the method for the joint restoration of heavy metal polluted soil of microorganism, comprise the following steps:

[0030] S1: Lay an anti-seepage membrane at a depth of 30cm in the heavy metal-contaminated soil, and break up the overturned soil agglomerates;

[0031] S2: uniformly mix the curing agent and the heavy metal-contaminated soil to obtain a mixed system, and the mass ratio of the curing agent to the heavy metal-contaminated soil is 1:100;

[0032] S3: Add water to the mixed system, so that the water content of the mixed system is 35%, and the standing time is 10 days;

[0033] S4: Dig a water diversion ditch around the heavy metal contaminated soil, and lay an anti-seepage film at the bottom of the water diversion ditch;

[0034] S5: washing the soil with water for 3 times;

[0035] S6: Spray the sterilizing solution on the soil to sterilize the soil. The spraying rate is 0.5 tons per mu per hour, stop for 1 hour after 3 hour...

Embodiment 2

[0041] S1: Lay an anti-seepage membrane at a depth of 50cm in the heavy metal-contaminated soil, and break up the overturned soil agglomerates;

[0042] S2: uniformly mix the curing agent and the heavy metal-contaminated soil to obtain a mixed system, and the mass ratio of the curing agent to the heavy metal-contaminated soil is 3:100;

[0043] S3: Add water to the mixed system, so that the mixed system and water content are 50%, and the standing time is 15 days;

[0044] S4: Dig a water diversion ditch around the heavy metal contaminated soil, and lay an anti-seepage film at the bottom of the water diversion ditch;

[0045] S5: washing the soil with water for 5 times;

[0046] S6: Spray the sterilizing solution to the soil to sterilize the soil, the spraying rate is 1 ton per mu per hour, stop for 2 hours after 4 hours of treatment, and then continue the treatment for 2 consecutive days, the sterilizing solution is copper sulfate aqueous solution , the concentration of the ...

Embodiment 3

[0051] S1: Lay an anti-seepage membrane at a depth of 40cm in the heavy metal-contaminated soil, and break up the overturned soil agglomerates;

[0052]S2: uniformly mix the curing agent and the heavy metal-contaminated soil to obtain a mixed system, and the mass ratio of the curing agent to the heavy metal-contaminated soil is 2:100;

[0053] S3: Add water to the mixed system, so that the water content of the mixed system is 45%, and the standing time is 13 days;

[0054] S4: Dig a water diversion ditch around the heavy metal contaminated soil, and lay an anti-seepage film at the bottom of the water diversion ditch;

[0055] S5: washing the soil with water for 4 times;

[0056] S6: Spray the sterilizing solution on the soil to sterilize the soil. The amount of spraying is 0.8 tons per mu per hour. After 3.5 hours of treatment, stop for 1.5 hours, and then continue the treatment for 1.5 days. The sterilizing solution is sulfuric acid Copper aqueous solution, the concentratio...

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Abstract

The invention discloses a method for combined remediation of heavy metal contaminated soil through a curing agent and microorganisms, and belongs to the technical field of soil improvement. The methodcomprises following steps that firstly, an impermeable membrane is laid on the 30 to 50 cm deep position of the heavy metal contaminated soil; secondly, the curing agent and the heavy metal contaminated soil are mixed evenly, and a mixed system is obtained; thirdly, water is added into the mixed system, and the water containing amount of the mixed system ranges from 35 to 50%; fourthly, a water diversion trench is dug in the periphery of the heavy metal contaminated soil; fifthly, the water is used for carrying out drip washing on the soil for 3 to 5 times; sixthly, a sterilized solution is sprayed to the soil; seventhly, water is used for carrying out drip washing on the sterilized soil for 3 to 5 times; eighthly, a microbial agent is put into the soil, a microbial growth agent nutrientsolution is sprayed into the soil, and curing is carried out for 4 to 7 days. The curing method and the microorganism method are combined, and due to dual remediation, the soil remediation effect is ensured.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, and in particular relates to a method for jointly repairing heavy metal-contaminated soil with a curing agent and microorganisms. Background technique [0002] The problem of heavy metal pollution is a global environmental pollution problem. In recent years, the problem of heavy metal pollution in the world's soil has become increasingly prominent, especially in developing countries, posing a serious threat to the ecological environment, food safety and human health. At present, the remediation technologies for heavy metal-contaminated soil mainly include soil replacement method, chemical leaching method, phytoremediation method, etc., but the above remediation technologies have the disadvantages of high cost, long cycle, and many restrictions, so the curing method is a more commonly used remediation method. technology. The solidification method refers to adding a solidifying agent to r...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10B09C2101/00
Inventor 王金凡袁若月
Owner 四川川能环保科技有限公司
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