Soil Ecological Environment Restoration Method for Prevention and Control of Heavy Metal Pollution

A technology of polluted soil and restoration method is applied in the field of soil ecological environment restoration for prevention and control of heavy metal pollution, which can solve the problems of difficult engineering, need to improve restoration effect, and high cost, and achieves reduction of heavy metal content, increased utilization efficiency, and strong adsorption capacity. Effect

Active Publication Date: 2021-10-26
安徽春秋环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies have certain defects and scope of application, or there are constraints such as high cost, difficult engineering, limited repair pollution, and the repair effect needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The soil ecological environment restoration method for preventing and controlling heavy metal pollution includes the following steps:

[0057] Screening and crushing: use mechanical equipment to screen and crush the polluted soil, so that the average particle size of the soil particles is ≤20mm, and the pretreated polluted soil is obtained;

[0058] Preliminary remediation: move the pretreated contaminated soil to the treatment pool, add 3.5 times the soil volume of eluent, stir to mix the soil and eluent evenly, and react at 26°C for 6 hours;

[0059] Slurry-water separation: After the initial repair, the soil is separated from mud and water, and the separated wastewater is treated by electrochemical reaction to form precipitation and separation of heavy metals, and the separated soil is subjected to secondary repair;

[0060] Secondary restoration: Add the soil restoration agent to the primary restoration soil at a mass ratio of 1:80, then add tap water with a quarter...

Embodiment 2

[0064] The soil ecological environment restoration method for preventing and controlling heavy metal pollution includes the following steps:

[0065] Screening and crushing: use mechanical equipment to screen and crush the polluted soil, so that the average particle size of the soil particles is ≤20mm, and the pretreated polluted soil is obtained;

[0066] Preliminary remediation: move the pretreated contaminated soil to the treatment pool, add 3.8 times the soil volume of eluent, stir to mix the soil and eluent evenly, and react at 27°C for 7 hours;

[0067] Slurry-water separation: After the initial repair, the soil is separated from mud and water, and the separated wastewater is treated by electrochemical reaction to form precipitation and separation of heavy metals, and the separated soil is subjected to secondary repair;

[0068] Secondary remediation: Add soil remediation agent to the primary remediation soil at a mass ratio of 1:85, then add tap water with a quarter of ...

Embodiment 3

[0072] The soil ecological environment restoration method for preventing and controlling heavy metal pollution includes the following steps:

[0073] Screening and crushing: use mechanical equipment to screen and crush the polluted soil, so that the average particle size of the soil particles is ≤20mm, and the pretreated polluted soil is obtained;

[0074] Preliminary remediation: move the pretreated contaminated soil to the treatment pool, add leaching solution 4 times the volume of the soil, stir to mix the soil and rinsing solution evenly, and react at 28°C for 8 hours;

[0075] Slurry-water separation: After the initial repair, the soil is separated from mud and water, and the separated wastewater is treated by electrochemical reaction to form precipitation and separation of heavy metals, and the separated soil is subjected to secondary repair;

[0076] Secondary restoration: Add the soil restoration agent to the primary restoration soil according to the mass ratio of 1:90...

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PUM

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Abstract

The invention discloses a soil ecological environment restoration method for preventing and controlling heavy metal pollution, which comprises the following steps: screening and crushing: screening and crushing the polluted soil with mechanical equipment; preliminary restoration: adding a leaching solution 3.5-4 times the volume of the soil, Reaction at 26-28°C for 6-8 hours; mud-water separation: mud-water separation, and the separated soil for secondary restoration; secondary restoration: add soil restoration agent to the primary restoration soil, and then add 1 / 4 of the soil mass tap water, stir and mix evenly, repair at 26-28°C for 3-5d. The present invention adopts primary restoration and secondary restoration for soil polluted by heavy metals. The primary restoration adopts eluent for elution, and the eluent adopts an aqueous solution of organic acid to wash away part of the heavy metals in the soil; the secondary restoration uses a soil remediation agent. Repairing can continue to absorb and degrade the heavy metals that have not been washed away, and at the same time, adding them to the soil can also improve the fertility of the soil.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a soil ecological environment remediation method for preventing and controlling heavy metal pollution. Background technique [0002] Soil is an important part of the earth's environment. The quality of the soil environment is closely related to our life. It is also an important part of the ecological environment, and it is the final destination of various pollutants. 90% of the world's pollutants are eventually stranded. in the soil. [0003] Inorganic pollutants are the main types of soil pollution, followed by organic pollutants, and the proportion of composite pollution is small. The number of points exceeding the standard of inorganic pollutants accounts for 82.8% of the total number of points exceeding the standard. Soil pollution leads to problems such as the reduction of soil fertility and the serious decline in the yield and quality of agricultural p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/02B09C1/08B09C1/10
Inventor 不公告发明人
Owner 安徽春秋环保科技有限公司
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