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Method for restoring hexavalent chromium-polluted soil by utilizing microbial fermentation

A technology for microbial fermentation and chromium-contaminated soil, applied in the field of remediation of chromium-contaminated soil, can solve the problems of high separation difficulty, high processing cost, difficulty in achieving high efficiency, low energy consumption and low investment, etc., and achieves a simple remediation process and good effect. , beneficial to growth and reproduction

Active Publication Date: 2014-01-08
HENAN JINGU IND DEV
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Problems solved by technology

However, because the soil polluted by chromium slag contains a large amount of toxic substance hexavalent chromium, hexavalent chromium is easily soluble in water and has strong permeability, and the soil contains a large amount of weeds, dead wood, sandstone and domestic garbage, etc., making it difficult to separate , the processing cost is high, and it is difficult to achieve high efficiency, low energy consumption, and low investment repair effect by using traditional restoration methods

Method used

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  • Method for restoring hexavalent chromium-polluted soil by utilizing microbial fermentation

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Embodiment 1

[0031] Such as figure 1 As shown, the method for microorganism-plant joint restoration of chromium-contaminated soil provided by the present invention includes three steps: material mixing, microbial fermentation to reduce hexavalent chromium to trivalent chromium, plant enrichment and removal of trivalent chromium, etc., specifically explained as follows .

[0032] (1) Material mixing

[0033] Excavate 1000kg of soil contaminated with hexavalent chromium from the soil polluted by hexavalent chromium, and the soil excavation depth is 0.3m. After the excavation was completed, the stones and other sundries in the soil were sorted out. After testing, the content of hexavalent chromium in the soil was about 300mg / kg.

[0034] 1000kg of soil, 500kg of sludge, and 50kg of straw are fully mixed through a mixer, and 5kg of composite bacteria BYM expansion bacteria are added during the mixing process. The sludge used in this example is from the sludge of urban domestic sewage trea...

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Abstract

The invention belongs to the technical field of heavy-metal pollution restoration of soil and particularly relates to a method for restoring soil chromium-polluted soil. According to the main principle of the method, sludge, straws, the chromium-polluted soil and composite strains BYM (Bacterial Enzyme) are mixed and fermented and biological enzyme, organic sugar, and other substances which are generated in a microbial fermentation process are used for reducing hexavalent chrome contained in soil into trivalent chromium; and then chromium pollutants contained in the soil are thoroughly removed by planting a chromium hyperaccumulator. Compared with the prior art, the method disclosed by the invention belongs to an in-situ restoration technology, has the advantages of small investment, low operation cost and minimal environmental disturbance, can improve the hardening degree of the soil, enhance the loose degree of the soil and increase the content of organic matters contained in the soil and is favorable to the plant growth of the restored soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal pollution in soil, and in particular relates to a method for remediation of chromium-contaminated soil. Background technique [0002] With the advancement of industrialization, the environmental problems generated in the process of economic development have gradually attracted people's attention. In recent years, the heavy metal pollution of the atmosphere, water and soil environment and its treatment and restoration have gradually become the focus of people's attention. Among them, due to the complex composition of pollutants in the soil, the difficulty of treatment, and the high cost, the treatment and restoration of heavy metal pollution in soil is currently a hot and difficult point in the research of heavy metal pollution restoration. [0003] Soil heavy metal pollution refers to the phenomenon that the accumulation of heavy metals in the soil due to natural activities or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
Inventor 李顺灵潘志恒黄立志袁明涛李万灵燕战军齐水莲施龙王静
Owner HENAN JINGU IND DEV
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