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Leaching remediation method for heavy metal contaminated soil

A technology of contaminated soil and remediation method, which is applied in the field of leaching and remediation of heavy metal-contaminated soil, which can solve the problems of difficult cultivation of high heavy metal-resistant plants, long cycle, poor mobility, etc., to achieve rapid and efficient leaching and remediation, reduce heavy metal content, The effect of reducing toxic effects

Inactive Publication Date: 2020-04-10
纳琦绿能工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using engineering measures to control heavy metal-contaminated soil has the advantages of thorough and stable effects, but this method requires a large amount of engineering, high treatment costs, and is likely to cause soil fertility to weaken
[0005] Biological measures are simpler and quicker to implement, with less investment and less impact on the environment, but the treatment efficiency is low, because the hyperaccumulative plants are usually short, resulting in low biomass, slow growth and long cycle, and the cultivation of plants with high resistance to heavy metals Difficult, not easy to treat heavily polluted soil
Microbes added to the soil environment of the remediation site have poor resistance and are difficult to adapt quickly. They have poor mobility in the soil environment and are easily inhibited by the toxic effects of pollutants, which affects the treatment effect.
[0006] The use of agricultural measures to treat heavy metal-contaminated soil has the advantages of combining with conventional agricultural operations, lower costs, and more convenient implementation. The same period is long and the effect is not significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The leaching repair method of heavy metal polluted soil comprises the following steps:

[0041] Step (1) Modified pretreatment of contaminated soil

[0042] In the area to be repaired, excavate the contaminated soil in situ, then crush, pulverize, and sieve the soil to make the soil particles uniform and ensure that the particle size of the soil particles is not greater than 2cm;

[0043] Mix the soil particles with the modifying agent, then add water and stir evenly, let it stand for 14 days for aging maintenance, and obtain modified polluted soil after curing;

[0044] The modifier is prepared from domestic solid waste incineration slag, and the preparation method is as follows: domestic solid waste incineration slag is first aged, and the aging time is 30 days; the aging domestic solid waste Crushing and sieving the waste incineration slag, so that the particle size of the slag particles is not greater than 5mm;

[0045] The pulverized slag particles are pickled wi...

Embodiment 2

[0059] The leaching repair method of heavy metal polluted soil comprises the following steps:

[0060] Step (1) Modified pretreatment of contaminated soil

[0061] In the area to be repaired, excavate the contaminated soil in situ, then crush, pulverize, and sieve the soil to make the soil particles uniform and ensure that the particle size of the soil particles is not greater than 2cm;

[0062] Mix the soil particles with the modifier, then add water and stir evenly, let it stand for 10 days for aging maintenance, and obtain modified polluted soil after curing;

[0063] The modifier is prepared from domestic solid waste incineration slag, and the preparation method is as follows: domestic solid waste incineration slag is first aged, and the aging time is 30 days; the aging domestic solid waste Crushing and sieving the waste incineration slag, so that the particle size of the slag particles is not greater than 5mm;

[0064] The pulverized slag particles are pickled with dilu...

Embodiment 3

[0078] The leaching repair method of heavy metal polluted soil comprises the following steps:

[0079] Step (1) Modified pretreatment of contaminated soil

[0080] In the area to be repaired, excavate the contaminated soil in situ, then crush, pulverize, and sieve the soil to make the soil particles uniform and ensure that the particle size of the soil particles is not greater than 2cm;

[0081] Mix the soil particles with the modifying agent, then add water and stir evenly, let it stand for 14 days for aging maintenance, and obtain modified polluted soil after curing;

[0082] The modifier is prepared from domestic solid waste incineration slag, and the preparation method is as follows: domestic solid waste incineration slag is first aged, and the aging time is 30 days; the aging domestic solid waste Crushing and sieving the waste incineration slag, so that the particle size of the slag particles is not greater than 5mm;

[0083] The pulverized slag particles are pickled wi...

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Abstract

The invention provides a leaching remediation method of heavy metal contaminated soil. The method comprises the following steps: (1) performing modification pretreatment of contaminated soil, mixing soil particles with a modifier, adding water, uniformly stirring, standing for 7-14 days, and carrying out aging maintenance to obtain modified contaminated soil; (2) carrying out leaching treatment onthe contaminated soil subjected to modification pretreatment, carrying out solid-liquid separation after leaching is completed, and collecting to obtain leached soil and leaching waste liquid; and (3) performing passivating and stabilizing, mixing charcoal powder with the soil leached in the step (2), adding water, uniformly stirring, and performing aging and maintaining. The method not only canimprove the restoration effect but also treats waste with waste, and the method meets the requirement of encouraging comprehensive utilization of resources in China.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for rinsing and remediating soil contaminated by heavy metals. Background technique [0002] At present, the area of ​​cultivated land polluted by heavy metals such as Cd, Cr, and Pb in my country is nearly 20 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Due to the characteristics of universality, concealment, and long-term nature of heavy metal pollution, the treatment of heavy metal-contaminated soil is still a major problem in the world today. On the one hand, soil heavy metal pollution will endanger the health of humans and animals by polluting the food chain or the atmosphere, causing cancer or chronic diseases; on the other hand, it may lead to crop yield reduction or failure. [0003] At present, there are mainly four methods for soil heavy metal pollution control: physical engineering measures, biological measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08B09C2101/00
Inventor 金峰王存建周弋翔董锡洪扈明云
Owner 纳琦绿能工程有限公司
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