EGSB (Expanded Granular Sludge Bed)-MFC (Microbial Fuel Cell) coupling system and degrading method for treating degradation-resistant coking wastewater

Abstract

The invention belongs to the technical field of energy and sewage treatment and aims at solving the problems of organic matters and ammonia nitrogen cannot be simultaneously treated or reach the standards and the like caused by an inhibiting effect of toxic substances on a denitrifier in the coking wastewater treatment of an EGSB reactor. The invention provides an EGSB (Expanded Granular Sludge Bed)-MFC (Microbial Fuel Cell) coupling system and a degradation method for treating degradation-resistant coking wastewater. A reaction zone of an EGSB anaerobic reactor is an anode chamber of the coupling system; a recirculation zone is a cathode chamber set as the coupling system; the cathode chamber is connected with the anode chamber by a connecting pipe provided with cation exchange membranes;conducting electrodes are separately arranged in the cathode chamber and the anode chamber; the conducting electrodes of a cathode and an anode are connected with an external resistor; the bottom ofthe anode chamber is connected with a water inlet tank by a porous water distribution board; a water outlet is formed in the top of the anode chamber and connected with the top of the cathode chamber;the bottom of the cathode chamber is connected with the bottom of the anode chamber by a connecting pipe. The coupling system and the degrading method, disclosed by the invention, have the advantagesthat the structure is simple and the performance is optimized; the organic matters and nitrogen-containing compounds in the coking wastewater can be synchronously removed, sufficient degradation of the coking wastewater is realized and electric recovery energy can be produced.

Description

technical field [0001] The invention belongs to the technical field of energy and sewage treatment, and in particular relates to an EGSB-MFC coupling system for treating refractory coking wastewater and a degradation method thereof. Background technique [0002] Coking wastewater is a typical refractory organic wastewater containing aromatic compounds such as polycyclic aromatic hydrocarbons. Its large-scale discharge causes serious water pollution and directly threatens human health. Therefore, the treatment of coking wastewater has become an important issue in the field of wastewater treatment. Important tasks and puzzles. In addition to pretreatment, coking wastewater treatment methods are still dominated by biological methods, such as traditional A / O, A 2 / O and its improved process, the main problems of these methods are: (1) The concentration of sludge is low, and the ability to resist impact load is weak; (2) The energy consumption of treatment is high. At present, ...

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Problems solved by technology

[0007] The present invention provides an EGSB-MFC for treating refractory coking wastewater in order to solve the problem that organic matter and ammonia nitrogen cannot be treated up to the standard due to the inhibitory effect of toxic substances on denitrification bacteria in the EGSB reactor. The coupling system and its degradation method effectively utilize the wastewater treatment advantages of EGSB and MFC. It has a simple structure and optimized performance, and can simultaneously remove organic matter and nitrogen-containing compounds in coking wastewater to achieve full degradation of coking wastewater.

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