A kind of washing agent and its application method for repairing cu, pb, as compound polluted soil

A technology of compound pollution and leaching agent, applied in the field of contaminated soil remediation, can solve problems such as unsatisfactory removal effect, and achieve the effects of low As removal rate, promotion of transfer, promotion of sedimentation and filtration

Inactive Publication Date: 2019-05-07
江西夏氏春秋环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, it has become an obvious trend to use natural surfactants to remove metals from polluted soils, but most of the leaching agents are not effective in removing As

Method used

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  • A kind of washing agent and its application method for repairing cu, pb, as compound polluted soil
  • A kind of washing agent and its application method for repairing cu, pb, as compound polluted soil
  • A kind of washing agent and its application method for repairing cu, pb, as compound polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Removal Efficiency of EDTA to Three Heavy Metal Compound Polluted Soils

[0036] The steps are as follows:

[0037] (1) Prepare eluting solutions containing different concentrations of EDTA, the concentrations are 0.01mol / L, 0.02mol / L, 0.03mol / L, 0.04mol / L, 0.05mol / L;

[0038] (2) Take heavy metal-contaminated soil and measure the content of Cu, Pb, and As in the soil;

[0039] (3) Sieve the soil particles with water, remove the sundries, and remove the soil with larger particles;

[0040] (4) Send the treated sieved soil to the leaching tank, inject the eluent and stir it for 10-12 hours, settle for 2-4 hours, collect the eluent and enter the recovery system for recycling;

[0041] (5) Test the soil after washing until the test result is qualified;

[0042] (6) Measure the content of Cu, Pb and As in the qualified soil, and calculate the removal rate.

[0043] The specific results are attached figure 1 shown by the attached figure 1 From the data in the figure, i...

Embodiment 2

[0045] The Removal Efficiency of Tween-80 to Three Heavy Metal Compound Contaminated Soils

[0046] The steps are as follows:

[0047] (1) Prepare leaching solutions containing different concentrations of Tween-80, the mass concentrations are 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% respectively;

[0048] (2) Take heavy metal-contaminated soil and measure the content of Cu, Pb, and As in the soil;

[0049] (3) Sieve the soil particles with water, remove the sundries, and remove the soil with larger particles;

[0050] (4) Send the treated sieved soil to the leaching tank, inject the eluent and stir it for 10-12 hours, settle for 2-4 hours, collect the eluent and enter the recovery system for recycling;

[0051] (5) Test the soil after washing until the test result is qualified;

[0052] (6) Measure the content of Cu, Pb and As in the qualified soil, and calculate the removal rate.

[0053] The specific results are attached figure 2 shown by the attached figure 2 It can be known ...

Embodiment 3

[0055] Removal Efficiency of SDS on Three Heavy Metal Compound Contaminated Soils

[0056] The steps are as follows:

[0057] (1) Prepare washing solutions containing different concentrations of SDS, the mass concentrations are 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% respectively;

[0058] (2) Take heavy metal-contaminated soil and measure the content of Cu, Pb, and As in the soil;

[0059] (3) Sieve the soil particles with water, remove the sundries, and remove the soil with larger particles;

[0060] (4) Send the treated sieved soil to the leaching tank, inject the eluent and stir it for 10-12 hours, settle for 2-4 hours, collect the eluent and enter the recovery system for recycling;

[0061] (5) Test the soil after washing until the test result is qualified;

[0062] (6) Measure the content of Cu, Pb and As in the qualified soil, and calculate the removal rate.

[0063] The specific results are attached image 3 shown by the attached image 3 It can be seen from the data th...

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Abstract

The invention provides an eluting agent for repairing Cu, Pb, As combined contaminated soil and a using method thereof. Main compositions of the eluting agent are Twain-80, anionic surfactant and EDTA, wherein the anionic surfactant is one of SDS, SDBS and lauric acid, and volume ratio of the EDTA, the Twain-80 and the anionic surfactant is 1:2:2. The using method comprises the following steps that (1) contaminated soil is screened with water after mixed with the water, sundries and the soil with larger particles are removed; (2) the screened soil is delivered to an eluting pool to be stirredfor 10-12 h and precipitated for 2-4 h, eluting liquid is collected to a recovery system for recycling; (3) the soil after eluted is detected until the detection result is qualified; and (4) the qualified soil after processing is dehydrated and then refilling is carried out. The anionic surfactant and chelating agent are adopted to jointly process the Cu, Pb, As combined contaminated soil, removalrate of Cu, Pb, As in the soil can be improved, and specific effects of the repairing of the Cu, Pb, As combined contaminated soil can be achieved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to a leaching agent for removing heavy metals copper, lead and arsenic in soil and a use method thereof. Background technique [0002] In recent years, with the acceleration of urbanization, heavy metal pollution incidents continue to occur. Pollution incidents such as "lead poisoning", "cadmium category", "heavy metal polluted vegetables" and other pollution incidents have aroused great concern for Chinese people on heavy (type) metal pollution. Soil heavy metal pollution has become one of the problems of sustainable agricultural development in China. According to the survey conducted by the Ministry of Agriculture of the People's Republic of China on the "Overview of Heavy Metal Pollution in Cultivated Land Soil in China", the area of ​​China's cultivated land polluted accounts for 16.7% of the total area, and the main polluting elements are mercury (Hg), cadmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08C09K17/18
CPCB09C1/02B09C1/08C09K17/18
Inventor 孙燕张燕王江帆
Owner 江西夏氏春秋环境股份有限公司
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