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Eluting agent for repairing stibium and arsenic composite contaminated soil

A technology for compound pollution and contaminated soil, applied in the field of contaminated soil remediation, can solve problems such as poor elution effect, and achieve the effects of simple components, short elution time, and good economic efficiency

Inactive Publication Date: 2019-03-12
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few leaching materials for antimony-arsenic compound pollution in China. Many leaching agents have better effects on cationic heavy metals, but they are not effective against excessive metal leaching, such as arsenic and antimony, which mostly exist in nature in the form of oxyanions. The removal effect is poor

Method used

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  • Eluting agent for repairing stibium and arsenic composite contaminated soil
  • Eluting agent for repairing stibium and arsenic composite contaminated soil
  • Eluting agent for repairing stibium and arsenic composite contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A leaching agent for repairing antimony-arsenic composite polluted soil, comprising the following components in parts by weight:

[0023] 6 parts of 0.2mol / L sodium dihydrogen phosphate, 3 parts of 0.04mol / L tartaric acid, 1 part of 1mol / L ammonium oxalate.

Embodiment 2

[0025] The five-point sampling method was used to collect low-polluted rice field soil, moderately polluted upland soil, and highly polluted waste mine contaminated soil as experimental groups K1, K2, and K3. First, about 1 cm of surface soil was taken out, and then 0-20 cm The surface soil, then fully mix the 5 parts of the soil of each experimental group, then air-dry the 3 experimental groups K1, K2, K3 naturally, remove the stone debris, grind it, grind it finely, and pass it through 20 mesh and 100 mesh respectively. Mesh nylon sieve, in which 20 mesh soil samples are used as soil for leaching experiments, and 100 mesh samples are used for soil heavy metal physical and chemical properties analysis.

[0026] Take the contaminated soil in the rinse bottle, place the rinse agent in Example 1 in a water-to-soil ratio of 10:1 at 25°C in an overturning shaker for 2 hours, centrifuge at 4000rpm for 15 minutes, and discard The supernatant was air-dried and ground to measure the h...

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PUM

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Abstract

The invention provides an eluting agent for repairing stibium and arsenic composite contaminated soil. The eluting agent comprises, by weight, 4-8 parts of sodium dihydrogen phosphate, 2-5 parts of tartaric acid and 1-4 parts of ammonium oxalate. The eluting agent is used for repairing the composite contaminated soil containing Sb and As, can rapidly remove stibium and arsenic in the composite contaminated soil and is high in removal rate and shorter in eluting time. The eluting agent with simple components is remarkable in effect, low in cost and excellent in economical efficiency. The eluting agent can effectively separate stibium and arsenic in the soil, soil fertility can still be kept after use, crops are planted after the soil is repaired, the content of stibium and arsenic in the crops is remarkably reduced, and the growth status and quality of the crops cannot be affected.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a leaching agent for remediating antimony-arsenic composite polluted soil. Background technique [0002] With the development of modern industrialization and urbanization, human activities have led to increasingly serious heavy metal pollution in the soil environment. Heavy metal pollution in the soil environment will reduce the quality of agricultural products, and these products will also bring potential harm to human health after being eaten. [0003] my country is the most important antimony reserve and antimony production country, and the antimony output accounts for about 84% of the world's total. With the rapid development of industrialization, a large amount of antimony and arsenic smelting residues are discharged into the surrounding environment, resulting in serious antimony and arsenic compound pollution in the soil. Antimony and arsenic have ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 雷鸣谭迪
Owner HUNAN AGRICULTURAL UNIV
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