Device and method for remedying site contaminants through microbiological electrochemical method

Abstract

The invention discloses a device and method for remedying site heavy metal contamination through a microbiological electrochemical method. The device comprises a porous inner tube, a porous sleeve tube, a wire, an electrode and an external power supply, the porous inner tube is connected to the interior of the porous sleeve tube in a sleeved mode, the electrode inoculated with electrochemical active microorganisms is installed between the porous inner tube and the porous sleeve tube, the electrode can be a plant-carbonized electrode, and the electrode and the external power supply are connected through the wire. According to the device and method, the biological reduction efficiency of soil heavy metal ions is significantly improved, the soil heavy metal ions are reduced into non-poisonousand harmless substances, and the site remediation purpose is achieved.

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 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 the economy, heavy metal pollutants produced by various man-made pollution sources such as residential garbage, agricultural chemical fertilizer and pesticide application, industrial "three wastes" discharge, and traffic pollution enter the soil through various channels to cause soil heavy metal pollution. [0003] Heavy metal pollution has become a major ecological and environmental issue 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 still a la...

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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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