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Compound eluting agent for repair of arsenic contaminated soil and use method and application thereof

A compound eluent and contaminated soil technology, applied in the field of heavy metal contaminated soil remediation, can solve the problems of few demonstration projects, achieve the effect of improving the remediation effect, reducing the risk of soil arsenic pollution, and avoiding waste

Active Publication Date: 2017-06-13
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In New Jersey and Massachusetts of the United States, there have also been examples of soil restoration using soil leaching technology, but in my country, most of them are concentrated in the laboratory research stage, and there are few demonstration projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Collected from the yellow soil of a farmland in Fujian, the soil pH is 4.68, and the arsenic content is 116.68mg / kg.

[0050] The collected soil was removed and ground to pass through a 2mm sieve to make 10-mesh contaminated soil. Weigh 10 g of the sieved soil, put it into a conical flask, add 100 mL of prepared compound eluent (0.01 mol / L trisodium ethylenediamine disuccinate 50% by volume, 0.5 mol / L oxalic acid 50% Parts by volume), that is, the liquid-solid ratio is 10mL: 1g, put it into a constant temperature shaking box, and shake and rinse for 8 hours at 25°C and 150r / min.

[0051] Stand still, separate the liquid and solid from the soil after shaking and leaching, remove the leaching waste liquid, add 100mL of clear water, that is, the liquid-solid ratio is 10mL: 1g, and then put it in a constant temperature oscillation box, at 25°C, 200r / min Continue to shake for 2h under the same conditions.

[0052] The soil washed with clean water is subjected to liquid-sol...

Embodiment 2

[0056] Collected from purple soil in a farmland in Sichuan, the soil pH is 7.36, and the arsenic content is 126.92mg / kg.

[0057] The collected soil was removed and ground to pass through a 2mm sieve to make 10-mesh contaminated soil. Weigh 10g of the sieved soil, put it into a conical flask, add 150mL of prepared composite eluent (0.01mol / L trisodium ethylenediamine disuccinate 50% by volume, 0.5mol / L oxalic acid 50% Parts by volume), that is, the liquid-solid ratio is 15mL: 1g, put it into a constant temperature oscillation box, and shake and rinse for 10h at 25°C and 200r / min.

[0058] Stand still, separate the liquid and solid from the soil after shaking and leaching, remove the leaching waste liquid, add 100mL of clean water, that is, the liquid-solid ratio is 10mL: 1g, and then put it into a constant temperature oscillation box, at 25°C, 200r / min Continue to shake for 2h.

[0059] The soil washed with clean water is subjected to liquid-solid separation, and the clean w...

Embodiment 3

[0063] Collected from black soil in a farmland in Liaoning, the soil pH is 5.93, and the arsenic content is 127.54mg / kg.

[0064] The collected soil was removed and ground to pass through a 2mm sieve to make 10-mesh contaminated soil. Weigh 10 g of the sieved soil, put it into a conical flask, add 200 mL of prepared compound eluent (0.01 mol / L trisodium ethylenediamine disuccinate 50% by volume, 0.5 mol / L oxalic acid 50% Parts by volume), that is, the liquid-solid ratio is 20mL: 1g, put it into a constant temperature shaking box, and shake and rinse for 12 hours at 25°C and 250r / min.

[0065] Stand still, separate the liquid and solid from the soil after shaking and leaching, remove the leaching waste liquid, add 100mL of clean water, that is, the liquid-solid ratio is 10mL: 1g, and then put it into a constant temperature oscillation box, at 25°C, 200r / min Continue to shake for 2h.

[0066] The soil washed with clean water is subjected to liquid-solid separation, and the cle...

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Abstract

The invention belongs to the field of repair of heavy metal contaminated soil, and in particular, relates to a compound eluting agent for repair of arsenic contaminated soil and a use method and an application thereof. Ethylenediaminedisuccinic acid trisodium salt (EDDS) and oxalic acid are effectively proportioned and combined to form the compound eluting agent, eluting process parameters are optimized, arsenic in the contaminated soil can be efficiently removed, the eluting technological process is simple and easy to operate, the harm of the arsenic contaminated soil after repair is greatly reduced, and secondary pollution cannot be caused.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and in particular relates to a compound eluent for remediating arsenic-contaminated soil and its use method and application. Background technique [0002] Soil is the core of land resources and one of the basic environmental elements for human survival. In recent years, with the development of my country's industry and agriculture and the acceleration of urbanization, the accompanying problem of heavy metal pollution in soil has intensified. According to the National Soil Pollution Survey Bulletin, the total excess rate of the national soil is 16.1%, the pollution type is mainly inorganic, and the excess rate of arsenic is 2.7%, the overall situation is not optimistic. Arsenic is a highly toxic variable price element with carcinogenic, teratogenic and mutagenic effects. Arsenic in polluted soil can cause great harm to human body, animals and plants through the spread ...

Claims

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Application Information

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IPC IPC(8): C09K17/14B09C1/02B09C1/08C09K101/00
CPCB09C1/02B09C1/08C09K17/14C09K2101/00
Inventor 李莲芳朱昌雄李峰叶婧李红娜吴翠霞
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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