Device and method for remediating site pollutants by microbial electrochemical method

Abstract

The invention discloses a device and method for remediating heavy metal pollution in a site by a microbial electrochemical method, comprising a porous inner tube, a porous sleeve, a wire, an electrode and an external power source. An electrode inoculated with electrochemically active microorganisms is installed between the casings, the electrode can be a carbonized plant electrode, and a wire is connected to the electrode and an external power source. The invention greatly improves the biological reduction efficiency of soil heavy metal ions, reduces soil heavy metal ions into non-toxic and harmless substances, and achieves the purpose of site restoration.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a device and method for remediating site pollutants by a microbial electrochemical method. Background technique [0002] Soil is the main component of the ecological environment and the material basis for human survival. However, with the rapid development of economy, heavy metal pollutants generated by various man-made pollution sources such as household garbage, agricultural fertilizer and pesticide application, industrial "three wastes" discharge, and traffic pollution enter the soil through various channels, causing soil heavy metal pollution. [0003] Heavy metal pollution has become a major ecological and environmental problem of widespread concern in China, posing a serious threat to the sustainable development of modern agriculture and social economy, the agricultural ecological environment and the quality and safety of agricultural products. There is currently no success...

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Problems solved by technology

[0004] In recent years, soil heavy metal remediation technology has developed rapidly. The patent application number is CN 107586067 A, and the title of the invention is "a solidification agent for chromium-contaminated soil and its preparation method." Reduce the dissolution of hexavalent chromium and total chromium in polluted soil by preparing a solidification agent , the repair cost of this method is high, and it only treats the symptoms but not the root cause

The patent application number is CN 107574162 A, and the title of the invention is "a preparation method based on a biochar-based slow-release nutrient-based immobilized bacterial agent." By preparing a biochar-based slow-release nutrient-based immobilized bacterial agent, the oil-contaminated soil can be restored. The decomposition of microorganisms, the degradation efficiency of pollutants is slow

The patent application number is the authorized announcement number CN 102386431 B, and the invention name is "a soil microbial fuel cell and repairing petroleum hydrocarbon pollution" to treat petroleum hydrocarbon polluted soil, relying on microorganisms to decompose organic matter to generate electricity, with low electricity production and low pollutant removal rate

Thereby need to develop effective, simple and efficient soil heavy metal remediation method, yet adopt electrochemically active microorganism and provide electron by external power supply at present, accelerate the bioreduction of heavy metal ion and reach the device and method of soil heavy metal pollution remediation and have not been reported yet

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