Method and device for restoring petroleum-polluted soil through composting by enhancing microbial fuel cells

Abstract

The invention relates to a method and device for restoring petroleum-polluted soil through composting by enhancing microbial fuel cells, belonging to the field of environment friendliness. The method comprises the steps of smashing kitchen wastes, then, mixing the kitchen wastes with smashed rice hull, hypsizigus marmoreus composts and rice bran according to a certain proportion, and naturally fermenting to obtain a composting product; mixing the composting product and the petroleum-polluted soil, placing the mixture into a composting tank, arranging the microbial fuel cells, and carrying out composting treatment in a natural environment. Anodes of the microbial fuel cells are distributed in the center of the composting tank, and cathodes are distributed on two side walls of the composting tank; an external resistor is connected between the anodes and the cathodes to form a closed circuit. Through enhancing the microbial fuel cells, the degradation of petroleum pollutants can be accelerated, the time for treating polluted soil can be shortened, and the degradation of microorganisms to low-concentration petroleum hydrocarbon at the later period of composting treatment can be promoted; the composting product is inoculated to the soil, so that not only can alkanes and polyaromatic hydrocarbons in the petroleum pollutants be degraded, but also the odor generated in a compacting process can be eliminated.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method and a device for microbial fuel cell reinforced compost repairing petroleum-contaminated soil. Background technique [0002] Petroleum is the main energy source in the world today. With the prosperity and development of human society and economy, the demand for petroleum in countries around the world is also increasing. However, due to technical and management deficiencies, the leakage or overflow of petroleum and its petroleum products during the process of petroleum exploration and exploitation, storage, transportation, refining, processing and use will cause serious environmental pollution. After oil enters the soil, it will cause changes in soil physical and chemical properties, block soil pores, change the composition and organization of soil organic matter, cause changes in the carbon-nitrogen ratio and carbon-phosphorus ratio of soil organic mat...

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Problems solved by technology

However, due to the severe nutritional imbalance in oil-contaminated soil and the lack of local microorganisms, there are disadvantages in the process of microbial oil-contaminated soil remediation, such as low pollutant degradation rate, long soil remediation period, and difficulty in degrading polycyclic aromatic hydrocarbon pollutants.

[0005] Composting is a controlled biodegradation and transformation process. It is a process in which microorganisms such as bacteria, yeasts, fungi, and actinomycetes existing in soil or waste are used to convert organic matter in soil or waste into fertilizer. In the composting system It contains a wide variety of microorganisms, which can not only degrade various organic pollutants, but also recycle waste resources. It is an energy-saving and environmentally friendly microbial treatment technology, but the effect of composting on low-concentration pollutants is poor, and Odor is often produced during composting

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