Sequencing batch anaerobic digestion equipment based on thermal hydrolysis and membrane separation and using method of equipment

Abstract

The invention relates to sequencing batch anaerobic digestion equipment based on thermal hydrolysis and membrane separation and a using method of the equipment. The equipment comprises a buffer tank,a slurrying tank, a thermal hydrolysis reaction tank, a flash evaporation tank, a dilution heat exchange unit, an anaerobic sequencing batch reaction tank, a cross-flow filtration membrane module, a dehydration device and a steam boiler. According to the equipment provided by the invention, the good solid-liquid separation characteristic of thermally-hydrolyzed sludge is fully utilized to design the anaerobic digestion reactor suitable for sequencing batch operation, a suitable membrane material is selected to construct the independent cross-flow filtration membrane module outside the digestion reactor, so that the solid-liquid separation performance of a material discharged by digestion is enhanced, the material discharged by digestion is changed from a solid-liquid mixture to a clarifiedfiltrate, effective separation of hydraulic retention time and solid residence time of anaerobic digestion of the thermally-hydrolyzed sludge is realized, the digestion residence time and the conversion degree of solid organic matter are greatly improved, a deep dehydration treatment amount of the digested sludge is reduced, and alkalinity consumption of the digestion filtrate by a dehydration agent is avoided.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sequencing batch anaerobic digestion device based on thermal hydrolysis and membrane separation and a use method thereof. Background technique [0002] Advanced anaerobic digestion technology is based on traditional anaerobic digestion technology combined with thermal hydrolysis technology. After the sludge is treated with high temperature and high pressure thermal hydrolysis, the flocs of the sludge are disintegrated one after another, the cells are broken, the particle size is reduced, and the viscosity is reduced, so that the fluidity of the sludge is significantly improved, and the solid-liquid separation effect is significantly improved. The sludge after thermal hydrolysis treatment is anaerobically fermented, the gas production rate is greatly increased, the sludge reduction rate reaches 70%, and the quality of sludge as a resource utilization product is also gre...

AI Technical Summary

Problems solved by technology

However, the current advanced anaerobic digestion system is still using the traditional digestion process, and its shortcomings are mainly manifested in: (1) the organic load is still relatively low; (2) the residence time is still relatively long; (3) the reaction The volume of the tank is still large, and the traditional digestion process does not make full use of the good solid-liquid separation performance of thermal hydrolysis sludge

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