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A stabilizing agent used for restoration of cadmium-polluted soil

A technology for cadmium-contaminated soil and contaminated soil, which is applied to a stabilizer for the remediation of cadmium-contaminated soil. The application of the above-mentioned stabilizer in the remediation of cadmium-contaminated soil can solve the problem of high energy consumption and high cost of soil leaching in soil barrier landfill technology , soil nutrient loss and other issues, to achieve the effect of benefiting subsequent utilization, improving electrostatic and surface adsorption effects, and increasing water retention and ventilation performance

Inactive Publication Date: 2017-03-22
北京德瑞科森环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the cost of soil leaching is high, which is likely to cause the loss of soil nutrients; the in-situ electric restoration technology has strict requirements on the soil type; the bioremediation technology has high requirements on the soil, takes a long time, and is easy to cause secondary pollution; high cost

Method used

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  • A stabilizing agent used for restoration of cadmium-polluted soil
  • A stabilizing agent used for restoration of cadmium-polluted soil
  • A stabilizing agent used for restoration of cadmium-polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Attapulgite over 200 mesh, set aside. The supplied sample is the soil of Zhuzhou smeltery area in Hunan (see Table 1), and the cadmium content is 9.57mg / kg. The samples were air-dried naturally, gravel and plant residues were picked out, ground through a 100-mesh sieve, and thoroughly mixed for use. Take 5g of attapulgite, 6g of sodium sulfide, and 2.5g of calcium dihydrogen phosphate, add it to 250g of cadmium-contaminated soil, first dry it with a glass rod and mix well, then add 160ml of deionized water, stir, and keep the temperature at (25±2)℃ Cultivate under the sun, add water every 1d by weighing method, keep the soil moisture at 70% of the field water capacity. Check after 15d and 20d of maintenance (see Table 2).

[0023] In this example, the EPA method (toxicity characteristic leaching precedee, TCLP) of the US Environmental Protection Agency was used to analyze the stabilization effect of cadmium after treatment, and the test results are shown in Table 3. ...

Embodiment 2

[0025] Attapulgite over 200 mesh, set aside. The sample provided for the test is the soil around the Qingshuitang lead-zinc mine in Qidong County, Hunan Province (see Table 4), with a cadmium content of 10.20 mg / kg. The samples were air-dried naturally, gravel and plant residues were picked out, ground through a 100-mesh sieve, and thoroughly mixed for use. Take 3g of attapulgite, 5g of sodium sulfide, and 4.5g of calcium dihydrogen phosphate, add it to 250g of cadmium-contaminated soil, first dry it with a glass rod and mix well, then add 160ml of deionized water, stir, and keep the temperature at (25±2)℃ Cultivate under the sun, add water every 1d by weighing method, keep the soil moisture at 70% of the field water capacity. Check after 15d and 20d of maintenance (see Table 5).

[0026] In this example, the EPA method (toxicity characteristic leaching precedee, TCLP) of the US Environmental Protection Agency was used to analyze the stabilization effect of cadmium after tre...

Embodiment 3

[0028] Attapulgite over 200 mesh, set aside. The sample provided for the test is the soil around the Lengshuikeng lead-zinc-silver mine in Guixi County, Jiangxi (see Table 7), with a cadmium content of 21.15 mg / kg. The samples were air-dried naturally, gravel and plant residues were picked out, ground through a 100-mesh sieve, and thoroughly mixed for use. Take 5g of attapulgite, 5g of sodium sulfide, and 2.5g of calcium dihydrogen phosphate, add it to 250g of cadmium-contaminated soil, first dry it with a glass rod and mix well, then add 160ml of deionized water, stir, and keep the temperature at (25±2)℃ Cultivate under the sun, add water every 1d by weighing method, keep the soil moisture at 70% of the field water capacity. Check after 15d and 20d of maintenance (see Table 8).

[0029] In this example, the EPA method (toxicity characteristic leaching precedee, TCLP) of the US Environmental Protection Agency was used to analyze the stabilization effect of cadmium after trea...

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Abstract

A stabilizing agent used for restoration of cadmium-polluted soil is disclosed. The stabilizing agent includes, based on the mass of the polluted soil, 1-2% of modified attapulgite, 2-3% of sodium sulfide and 1-3% of calcium dihydrogen phosphate. The stabilizing agent is added into the cadmium-polluted soil firstly and stirred to fully mix the stabilizing agent with the soil, water is added, stirring is performed continuously, the water content of fields with the soil is kept and maintenance is performed at room temperature. The stabilizing agent is cheap, easily available and good in effects and free of secondary pollution, does not greatly change the pH value of the polluted soil, can increase water retention and aeration properties of the soil and facilitates subsequent utilization of the soil.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a stabilizer for repairing cadmium-contaminated soil. [0002] The invention also relates to the application of the above-mentioned stabilizer in repairing cadmium-contaminated soil. Background technique [0003] Cadmium (Cd) is widely used in electroplating industry, chemical industry, electronics industry and nuclear industry and other fields. Cadmium, a by-product of zinc smelting and used in batteries, dyes or plastic stabilizers, is more easily absorbed by crops than other heavy metals. A considerable amount of cadmium is discharged into the environment through waste gas, waste water, and waste residue, causing pollution, and through the soil-plant system, it is enriched into the human body along with the food chain, endangering human health. [0004] Cadmium exists mainly in the form of positive divalent in the natural environment, and its co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08
CPCC09K17/08
Inventor 向猛张洁琼黄晓云罗章李淑彦马志飞张志新
Owner 北京德瑞科森环保科技有限公司
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