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Method for repairing soil polluted by heavy metal by combining chemical leaching and bioremediation

A bioremediation and chemical leaching technology, applied in the restoration of polluted soil, etc., can solve the problems of difficult dilution of refractory pollutants and self-purification elimination, and achieve the effect of avoiding secondary pollution and obvious repair effect

Active Publication Date: 2013-02-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0008] The pollution of heavy metals to soil is basically an irreversible process. The pollution of many organic chemicals also takes a long time to degrade. The soil polluted by some heavy metals may even take 100-200 years to recover. Refractory pollutants in polluted soil are difficult to eliminate by dilution and self-purification

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  • Method for repairing soil polluted by heavy metal by combining chemical leaching and bioremediation
  • Method for repairing soil polluted by heavy metal by combining chemical leaching and bioremediation

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with accompanying drawing and specific examples:

[0037]For heavily polluted heavy metal soil: use ethylenediamine disuccinic acid (EEDS) with a concentration of 20mmol / L as the eluent, and perform chemical leaching first, and first use the spray device 1 to pass the eluent through the spray pipe 2 The shower nozzle 3 is sprayed onto the polluted soil, relying on gravity, the spray agent infiltrates into the soil, and reacts with the heavy metal ions in the soil, and the heavy metal in the water-extracted state in the soil reaches the maximum after about 20 days of spraying Concentration; Then use the suction well 6 to pump the eluent containing heavy metals to the ground surface through the suction pipeline 5 for treatment, and dispose of it with the external treatment facility 4, such as figure 1 shown.

[0038] Bioremediation of soils containing low concentrations of heavy metals after chemical le...

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Abstract

The invention belongs to the technical field of environment protection, and discloses a method for repairing soil polluted by heavy metal by combining chemical leaching and bioremediation. To repair soil with a high heavy metal content and high toxicity, the invention provides the method adopting a strategy of carrying out chemical leaching and bioremediation in sequence. The method comprises the following steps: firstly, classifying different types of polluted soil into seriously polluted soil and mildly polluted soil; then leaching seriously polluted soil by adding acidic chelating agent and extracting high-concentration heavy metal in soil; and conducting bioremediation on part of residual low-concentration polluted soil which is not leached completely. The method is used for in-situ repairing of heavy metal, has an obvious effect in repairing soil polluted by heavy metal, and successfully avoids secondary pollution to soil.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for repairing heavy metal-contaminated soil by combining chemical leaching and biological restoration. Background technique [0002] Soil pollution refers to the phenomenon that harmful substances produced by human activities enter the soil. When the content exceeds the self-purification ability of the soil itself, the composition and properties of the soil will change, reduce the yield and quality of crops, and endanger human health. Heavy metals Pollution has become one of the most important environmental problems and one of the most important soil pollutants. After heavy metals enter the soil, they have certain toxic effects on soil microorganisms. According to reports, the area of ​​cultivated land polluted by heavy metals such as cadmium, mercury, and lead in my country is nearly 20 million hectares, accounting for about 1 / 5 of the tota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
Inventor 卢宏玮史斌何理张一梅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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