Device and method capable of controlling redox reduction potential to promote sludge dry method anaerobic fermentation

Abstract

The invention relates to a device capable of controlling redox reduction potential to promote sludge dry method anaerobic fermentation, the device can control the redox reduction potential to promote sludge dry method anaerobic fermentation, mainly comprises a fermentation tank, a stirrer, a motor, an anode, a cathode, a low-voltage direct current power supply, a wires and a carbon fiber conductive material, and is characterized in that: the stirrer is located horizontally in the axis of the fermentation tank, an axial stirring rod is sleeved and connected with the anode, the cathode is located on the wall of the fermentation tank, the carbon fiber conductive material is paved on the inner wall of the fermentation tank body, the low-voltage direct current power supply is arranged outside the fermentation tank body, and the anode and the cathode are connected through two wires. In order to improve the methane yield of sludge dry anaerobic fermentation, the redox reduction potential of the inner wall of the fermentation tank body can be controlled at -400mV by passing the additional direct current power supply through the carbon fiber conductive material so as to provide optimum growth redox environment for methane producing bacteria to achieve the object of methane producing bacteria enrichment and methane yield improvement. The solid content of the dry method fermented sludge is 10 ~ 20%.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a device and method capable of controlling oxidation-reduction potential to promote methane production by sludge dry anaerobic fermentation. Background technique [0002] At present, environmental and energy issues have become a major issue affecting the sustainable development of human society, and anaerobic digestion technology has outstanding advantages in energy production and environmental protection. Using sludge anaerobic fermentation to recover biomass energy is in line with the route of sustainable development , which fully embodies the goals of reduction, harmlessness and recycling of solid waste. Anaerobic digestion is divided into wet / low solid content digestion (<10%) and dry / high solid content digestion (>10%) according to the solid content of the processed materials. Compared with traditional wet digestion processes, dry digestion The process...

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Problems solved by technology

At present, there are no reports at home and abroad that use DC voltage to directly control the oxidation-reduction potential of high-solids anaerobic digestion to increase methane yield.

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