Recycling agent for recycling heavy-metal polluted soil leaching waste liquid, and preparation method and application of recycling agent

A technology of polluted soil and heavy metal capture agent, which is applied in the field of polluted soil environmental treatment to achieve the effect of solving treatment problems, simplifying steps and simple operation

Inactive Publication Date: 2018-09-28
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies in existing methods for regenerating waste liquid from chemical leaching of heavy metal-contaminated soils, the purpose of the present invention is to provide a method capable of realizing the regeneration and recycling of waste liquid from chemical leaching. The method is simple in operation, low in cost, and suitable for promotional use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of mixed eluent

[0034] The eluent is mixed with GLDA and citric acid in a molar ratio of 2:5, and the concentration of the mixed eluent is 50mmol·L -1 , pH value is 3.50.

[0035] 2. Generation of washing waste liquid

[0036] Basic properties of Cu-contaminated soil: the total Cu content in the soil is 543mg kg -1 , pH value 5.36, clay / silt / sand 19 / 56 / 25, organic matter content 16.6g·kg -1 , the cation exchange capacity is 9.4cmoL·kg -1 .

[0037] Weigh 10g of contaminated soil into a 250mL beaker, add 100mL of mixed eluent, 150r min -1 Stirring at a frequency of 4 hours, the solid-liquid separation is carried out after 4 hours of reaction, and the liquid produced at this time is the leaching waste liquid; the Cu concentration of the leaching waste liquid is 35mg L -1 , the pH value was 3.86, and the removal rate of Cu in the polluted soil was 64.4%.

[0038] 3. Preparation of regenerant

[0039] Be that 100 mesh montmorillonites are washed wit...

Embodiment 2

[0044] 1. Preparation of mixed eluent

[0045] The eluent is mixed with EDTA, GLDA and citric acid in a molar ratio of 1:1:3, and the concentration of the mixed eluent is 100mmol·L -1 , the pH value is 3.73.

[0046] 2. Generation of washing waste liquid

[0047] Basic properties of polluted soil: the total Cu content in the soil is 289mg·kg -1 , the total Pb content is 1420mg·kg -1 , pH value 7.36, clay / silt / sand 9 / 36 / 55, organic matter content 36.6g·kg -1 , the cation exchange capacity is 20.4cmoL·kg -1 .

[0048] Weigh 10g of contaminated soil into a 250mL beaker, add 100mL of mixed eluent and place it in a shaker at 150r·min -1 Oscillate at a frequency of 4 hours, and centrifuge after 4 hours for solid-liquid separation. The liquid produced at this time is the leaching waste liquid; the concentration of Cu in the leaching waste liquid is 15mg L -1 , Pb concentration is 115mg L -1 , pH value is 4.86, the removal rate of Cu in polluted soil is 51.9%, and the removal ...

Embodiment 3

[0054] 1. Preparation of mixed eluent

[0055] The eluent is mixed with EDTA, GLDA and citric acid in a molar ratio of 1:2:5, and the concentration of the mixed eluent is 100mmol·L -1 , pH value is 3.86.

[0056] 2. Generation of washing waste liquid

[0057] Basic properties of polluted soil: the total Cu content in the soil is 263mg·kg -1 , the total Pb content is 654mg·kg -1 , the total Cd content is 8.3mg·kg -1 , pH value is 7.05, clay / silt / sand is 12 / 34 / 54, organic matter content is 33.6g·kg -1 , the cation exchange capacity is 19.5cmoL·kg -1 .

[0058] Weigh 10g of contaminated soil into a 250mL beaker, add 100mL of mixed eluent and place it in a shaker at 150r·min -1 Oscillate at a frequency of 4 hours, and centrifuge after 4 hours for solid-liquid separation. The liquid produced at this time is the leaching waste liquid; the concentration of Cu in the leaching waste liquid is 10 mg L -1 , the Pb concentration is 49.1mg·L -1 , the concentration of Cd is 0.64mg ...

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PUM

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Abstract

The invention relates to a recycling agent for recycling a heavy-metal polluted soil leaching waste liquid. The recycling agent consists of a heavy-metal trapping agent and a carrier, wherein the massratio of the heavy-metal trapping agent to the carrier is (0.1-0.2):1. The carrier is montmorillonite or zeolite, and the heavy-metal trapping agent is sodium diethyldithiocarbamate. The recycling agent provided by the invention has the advantages that the recycling of the chemical leaching waste liquid can be realized, the recycling and reuse operation is simple, the cost is low, and the methodis suitable for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment of polluted soil, and in particular relates to a regenerant for regeneration of heavy metal polluted soil leaching waste liquid, a preparation method and application. Background technique [0002] The Ministry of Environmental Protection and the Ministry of Land and Resources jointly issued the "National Soil Pollution Survey Bulletin" in 2014, pointing out that the overall situation of China's soil environment is not optimistic. 82.8% of the points exceeding the standard, inorganic pollutants mainly include 8 heavy metals including cadmium, mercury, arsenic, copper, lead, chromium, zinc and nickel. Soil heavy metal pollution poses a serious threat to agricultural product safety and human health. Therefore, attention must be paid to the problem of soil heavy metal pollution. The promulgation of the "Soil Pollution Action Prevention and Control Plan" (referred to as "Soil Ten Arti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01D15/12C09K17/14
CPCB01D15/12B01J20/165C09K17/14
Inventor 郭晓方何秋生张桂香赵国慧杨玉红郑伟钱天伟
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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