Preparation method for novel composite positive electrode based on sludge nitrogen-doped charcoal and porous volcanic, and microbial fuel cell

Abstract

The invention discloses a preparation method for a novel composite positive electrode based on sludge nitrogen-doped charcoal and porous volcanic, and a microbial fuel cell, and belongs to the technical field of resource utilization of new materials, new energy and waste water. Active sludge is subjected to a nitrogen high-temperature pyrolysis baking method to be made into porous nitrogen-doped charcoal; then an acidifying method is adopted to remove minerals from the surface to improve the electric conductivity of the charcoal; finally, by taking volcanic granules as a carrier, surface charcoal loading is performed to prepare and form the nitrogen-doped charcoal granules on the volcanic surface; the novel granules are high in porosity, high in electrical conductivity, large in specific surface area and capable of fully satisfying performance requirement of the positive electrode material of the microbial fuel cell; by virtue of the novel nitrogen-doped porous charcoal positive electrode, the positive electrode electrochemically active microorganisms and loading capacity of microorganisms of the microbial fuel cell can be improved; conversion rate of biomass energy in waste water can be improved; by virtue of low-resistance characteristic, the electron transfer efficiency is also improved; and finally, the power improvement of the microbial fuel cell, resource processing of the waste water, and efficient biological power generation are realized at the same time.

Description

technical field [0001] The invention belongs to the technical field of new materials, new energy sources and wastewater resource utilization. The specific research and development content is to make porous nitrogen-doped biochar from activated biological sludge through nitrogen high-temperature pyrolysis baking method, and then remove surface minerals through acidification method. Improve the conductivity of biochar, and finally use volcanic rock particles as the carrier for surface biochar loading to prepare and form nitrogen-doped biochar particles on the surface of volcanic rock. The new particle has high porosity, good electrical conductivity and large specific surface area, and fully meets the performance requirements of the anode material of the microbial fuel cell. The new nitrogen-doped porous biochar anode can increase the loading capacity of electrogenic bacteria and microorganisms on the anode of microbial fuel cells, improve the conversion rate of biomass energy in...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a novel composite anode and microbial fuel cell based on sludge-based nitrogen-doped biochar and porous volcanic rock, which solves the problem of low loading rate of microorganisms in the anode of microbial fuel cells and can effectively improve the microbial fuel efficiency. The electron transfer rate of the battery solves the problems of poor potential stability of traditional microbial fuel cells

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