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Method for in-situ repair of heavy metal Pb and As-polluted soil

A technology for in-situ remediation of contaminated soil, applied in the restoration of contaminated soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of easily damaged soil structure, soil secondary pollution, etc., and achieve cheap and easy-to-obtain raw materials , the effect of reducing repair costs

Inactive Publication Date: 2016-11-23
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used curing agents are easy to damage the soil structure and cause secondary pollution to the soil. Therefore, it is urgent to find a curing agent that is cheap and easy to obtain, with little or no harm to the soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Weigh 60% of monoammonium phosphate, diammonium phosphate, superphosphate, the mass ratio of the three is 1.5:1:1.5, 1.5% of calcium oxide, 38.5% of polyaluminum ferric chloride, polyaluminum ferric sulfate and ferrous chloride, the mass ratio of the three is 1.5:1:1, and the above-mentioned raw materials are fully pulverized and mixed by a ball mill to obtain a heavy metal restoration and curing agent for polluted soil.

[0014] Take 700g of Pb-contaminated soil sample, grind it, and pass through 20 mesh sieves. After testing, the leaching concentration of Pb in the contaminated soil sample is 12.17 mg / L. Add 15g of curing agent, mix well, and add a certain amount of Deionized water, so that the moisture content of Pb-contaminated soil reaches 25%. According to the HJ / T300-2007 standard, the concentration of Pb ions in the leaching solution of the soil after curing for 7 days, 15 days, 23 days, 30 days, and 40 days was respectively measured. , the remediation effect o...

example 2

[0018] Weigh 30% monoammonium phosphate, diammonium phosphate, superphosphate, and the mass ratio of the three is 1.5:1:1.5; 2% calcium oxide; 68% polyaluminum ferric chloride, polyaluminum ferric sulfate and ferrous chloride, the mass ratio of the three is 2:1:1, and the above-mentioned raw materials are fully pulverized and mixed by a ball mill to obtain a heavy metal restoration curing agent for polluted soil.

[0019] Take 800g of As-contaminated soil samples, grind them, and pass through 20 mesh sieves. After testing, the leaching concentration of As in the contaminated soil samples is 9.35 mg / L. After adding 18g of curing agent and fully mixing; Ionized water makes the moisture content of As-contaminated soil reach 30%. According to the HJ / T300-2007 standard, the concentration of arsenic in the leaching solution of the soil after curing for 7 days, 15 days, 23 days, 30 days and 40 days was respectively measured, and the solid ratio of the leaching solution was 20:1 (L / Kg...

example 3

[0023] Weigh 55% of monoammonium phosphate, diammonium phosphate, and superphosphate, and the mass ratio of the three is 1.5:1:2; 3% of calcium oxide; 42% of polyaluminum ferric chloride, polyaluminum ferric sulfate and ferrous chloride, the mass ratio of the three is 2:0.5:1, and the above-mentioned raw materials are fully pulverized and mixed by a ball mill to obtain a heavy metal restoration and curing agent for contaminated soil.

[0024] Take 800g of mixed polluted soil, grind it, and pass through 20 mesh sieves. After testing, the leaching concentrations of Pb and As in the mixed polluted soil are 11.56 mg / L and 6.28 mg / L respectively. Add 32g of curing agent; A large amount of deionized water was used to make the water content of the contaminated soil sample reach 35%. According to the HJ / T300-2007 standard, the concentration of Pb and arsenic ions in the leaching solution of the soil after curing for 7 days, 15 days, 23 days, 30 days and 40 days were respectively measu...

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Abstract

The invention relates to a method for in-situ repair of heavy metal Pb and As-polluted soil, and belongs to the technical field of heavy metal-polluted soil repair. The method uses monoammonium phosphate, diammonium phosphate, calcium superphosphate, polyaluminum ferric chloride, polyaluminium ferric sulfate, ferrous chloride and calcium oxide as raw materials; and the raw materials are fully smashed and mixed by a ball mill to obtain a soil heavy metal repair curing agent. The raw materials for synthesizing the curing agent are cheap and easy to obtain; and when the heavy metal Pb and As is cured in situ, such nutrient elements as phosphorus, nitrogen, sulfur and iron are supplied to soil, so that the polluted soil repair is integrated with the fertilization, the repair cost of the heavy metal-polluted soil can be effectively reduced, and the method is suitable for repairing large-range heavy metal-polluted soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and specifically relates to a method for in-situ remediation of soil contaminated by heavy metals Pb and As. Background technique [0002] Soil heavy metal pollution is one of the major environmental hazards in the world, and can enter the human food chain through crops, seriously affecting food safety and endangering human health. Heavy metals in polluted soil mainly refer to five elements with significant biological toxicity, namely mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As). According to preliminary statistics, the area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, chromium, and lead in China is nearly 20 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Therefore, the remediation of heavy metal-contaminated soil is urgent. [0003] At present, heavy metal soil remedi...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/08C05G3/04C05G3/80
CPCB09C1/08B09C2101/00C05B1/02C05G3/80C09K17/08C05B7/00C05D3/02C05D9/00C05D9/02
Inventor 张文辉张定兵万亚珍梅丹丹谷守玉
Owner ZHENGZHOU UNIV
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