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

A fuel cell and oil-polluted technology, applied in the restoration of polluted soil, etc., can solve the problems of long soil remediation cycle, stench, nutritional imbalance, etc., and achieve the effect of shortening the processing time, reducing the processing burden, and reducing the production cost

Active Publication Date: 2014-03-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The size of the composting device used in this experiment is 2000 mm × 1000 mm × 500 mm. The outer wall is welded with 10 mm thick stainless steel plate. The two side walls are uniformly equipped with round holes with a diameter of 3 mm and the hole spacing is 5 mm. The anode of the microbial fuel cell is made of 5mm thick carbon felt with a size of 1500mm×500mm. Before use, soak it in isopropanol solution for 24 hours, dry it in the air, and then heat it in a programmable oven at 450°C for 30 minutes. Set up according to the attached drawing In the composting device, the lower side of the cathode is 100mm away from the bottom of the composting device, and the upper side of the anode is 200mm away from the soil surface. The cathode of the microbial fuel cell uses 5mm carbon felt with a size of 2000mm×1000m. Vulcan XC-72 conductive carbon black, 60% TPFE, and isopropanol are mixed and evenly spread on the cathode carbon felt according to the mass ratio of 70:42:31 as carb...

Embodiment 2

[0052] The moisture content of the soil not only affects the effect of composting, but also affects the enhanced performance of microbial fuel cells. In order to investigate the impact of different moisture content on the treatment effect of the present invention, design four groups of parallel experiments, three parallel experiments of every group design, test device is identical with example 1, and the soil moisture content after pretreatment is adjusted to 35%, 42%, 49% respectively %, 56%, regularly measure the voltage across the resistor. After 60 days of treatment, the analysis showed that the removal of total petroleum hydrocarbons first increased with the increase of soil water content, and when the water content was greater than 49%, the removal rate tended to be stable. The monitoring results of the voltage across the resistance of the microbial fuel cell show that the output power of the microbial fuel cell increases gradually with the increase of the soil moisture ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 卢宏玮杜鹏何理任丽霞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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