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Microbial fuel cell wastewater treatment system for improving nitrogen removal effect

A sewage treatment system and fuel cell technology, applied in biochemical fuel cells, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as limited application and increased cost

Active Publication Date: 2013-05-08
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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Problems solved by technology

However, the establishment of an additional aerobic nitrification bioreactor not only greatly limits its application in practical engineering, but also increases the cost

Method used

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  • Microbial fuel cell wastewater treatment system for improving nitrogen removal effect

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Embodiment 1

[0008] Example 1: Artificial wastewater mainly contains 550 mg / L of chemical oxygen demand (COD), 30 mg / L of ammonia nitrogen, 6 mg / L of total phosphorus and trace elements. The microbial fuel cell wastewater treatment system was operated with a hydraulic retention time of 3.0 days and a long sludge retention time (sludge was not discarded). The data acquisition system is Labjack U12, the anode and cathode are connected by a circuit with a resistance of 1000 Ω, and the reference electrode is an Ag / AgCl electrode. The anode chamber of microbial fuel cells (MFCs) was inoculated with anaerobic sludge cultured for 2 weeks, and the cathode chamber was inoculated with activated sludge from municipal sewage treatment plants that had been enriched by nitrification. The dissolved oxygen in the anode chamber is controlled below 0.1 mg / L, and the dissolved oxygen in the cathode chamber is maintained at 2.0~3.0 mg / L. The reactor has been running for nearly three months. After the operati...

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Abstract

The invention relates to a waste water treatment system, especially to a microbial fuel cell wastewater treatment system for improving a nitrogen removal effect. The invention aims to develop the waste water treatment system which is low in energy consumption, high-efficient and stable, and thus further improve the nitrogen removal effect of the microbial fuel cell wastewater treatment system. The invention is characterized in that the dual-chamber microbial fuel cell wastewater treatment system is composed of an anode and a cathode, wherein the anode is without any modification, a cathode camber of the microbial fuel cell is inoculated with nitrated sludge and added and embedded with aerobic denitrifying bacteria particles, so as to play effects of nitrification and denitrification in one reaction zone synergistically, fully utilize DO and residual carbon sources of the cathode, and realize purposes of denitrification and further COD removal. The microbial fuel cell wastewater treatment system provided by the invention shows good COD removal effects, high ammonia nitrogen and total nitrogen removal rate, and continuous and stable voltage output, and is free of waste sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to an emerging method for waste water treatment and microbial power generation. Combining microbial fuel cells, non-precious metals as catalysts and embedding aerobic denitrification bacteria technology, the method can effectively remove organic carbon, total nitrogen and generate electricity. Background technique [0002] At present, the nutrients in urban sewage and industrial wastewater are mostly ammonia nitrogen (NH 4 + ) and nitrate nitrogen (NO 3 - ) in the form of (Wastewater Engineering, Treatment and Reuse. 2003). The methods of nitrogen removal include ion exchange method, adsorption method, chemical method and biological method. Biological denitrification has been widely used for its low cost, low energy consumption, and secondary pollution (Applied Microbiology and Biotechnology. 2009, 82:415–429). Traditional denitrification mostly adopts two-stage...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34H01M8/16
CPCY02E60/527Y02E60/50
Inventor 于昌平冯翠杰
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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