Method for removing farmland heavy metal pollution in situ through environment-friendly eluting agent

A leaching agent and heavy metal technology, applied in the field of farmland management, can solve problems such as unacceptable prices and hazards, and achieve the effect of easy material acquisition and significant environmental protection benefits

Active Publication Date: 2019-04-26
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Application Information

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Problems solved by technology

But for already contaminated farmland, using these leaching agents will introduce new reage...

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  • Method for removing farmland heavy metal pollution in situ through environment-friendly eluting agent
  • Method for removing farmland heavy metal pollution in situ through environment-friendly eluting agent
  • Method for removing farmland heavy metal pollution in situ through environment-friendly eluting agent

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Embodiment Construction

[0061] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0062]After more than half a century of development, in-situ leaching mining has become a field of solution mining widely used in permeable uranium, copper, gold, rare earth, zinc, thorium and other minerals. The present invention utilizes the principle of in-situ leaching mining, adding CO 2 +O 2 Green eluent for in-situ remediation of heavy metal-contaminated farmland. Include the following steps:

[0063] ①The layout of the venue is as follows: figure 1 As shown, on the raw soil 4 of the farmland is the mellow soil 3, and the working cushion 2 and the plastic film 1 are successively set on the mellow soil 3;

[0064] The material of the working cushion 2 is composite soil with a thickness of 8-12cm, which prevents the eluent from entering the surface and overflowing; the material of the working cushion 2 is mi...

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Abstract

The invention belongs to the technical field of farmland management, and particularly relates to a method for removing farmland heavy metal pollution in situ through an environment-friendly eluting agent. The method comprises the following steps: (1) a work cushion layer and a plastic film are sequentially arranged on mellow soil of farmland; (2) a pumping and injecting system is formed; (3) smallholes are evenly formed in the outer surface of the part, inserted into the mellow soil, of an eluting filter pipe; (4) small holes are evenly formed in the outer surface of the part, inserted into the mellow soil, of a vacuum collection filter tube; (5) the environment-friendly eluting agent is determined; (6) the well distance is determined according to the migration speed and the repair periodT of the environment-friendly eluting agent in the mellow soil; and (7) the environment-friendly eluting agent enters the mellow soil through the eluting filter pipe, through oxidation and complexingreactions between the environment-friendly eluting agent and the mellow soil, heavy metal in the mellow soil is transferred into a liquid phase, the heavy metal polluted farmland is repaired in situ,and an eluting solution is formed. The technical scheme has the beneficial effects that the treatment process is carried out in situ, polluted soil does not need to be removed, and operation is easyand convenient.

Description

technical field [0001] The invention belongs to the technical field of farmland treatment, and in particular relates to a method for removing heavy metal pollution from farmland in situ with a green eluent. Background technique [0002] Heavy metals are a class of important pollutants in soil and agricultural products. Soil heavy metal pollution is mainly caused by the discharge of "three wastes" from mining, smelting, electroplating, and chemical industries, as well as the unreasonable application of sewage irrigation, sludge for agriculture, and pesticides and fertilizers. [0003] Existing heavy metal contaminated soil remediation techniques include leaching, solidification and stabilization, and phytoremediation. These heavy metal-contaminated soil remediation technologies are mainly based on two methods: one is to remove heavy metals from the soil to achieve the purpose of cleaning; the other is to fix heavy metals in the soil to reduce their migration ability and bioa...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08B09C2101/00
Inventor 江国平周根茂那平王立民陈乡张翀
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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