Sequencing batch anaerobic digestion device based on thermal hydrolysis and membrane separation and its application method

Abstract

The invention relates to a sequencing batch anaerobic digestion device based on thermal hydrolysis and membrane separation and a method for using the same, comprising a buffer tank, a slurry tank, a thermal hydrolysis reaction tank, a flash tank, a dilution heat exchange unit, an anaerobic Sequencing batch reactors, cross-flow filtration membrane modules, dehydration devices, and steam boilers make full use of the good solid-liquid separation characteristics of thermally hydrolyzed sludge to design suitable anaerobic digestion reactors for sequencing batch operation. A suitable membrane material was constructed, and an independent cross-flow filtration membrane module external to the digestion reactor was constructed, which enhanced the solid-liquid separation performance of the digested and discharged materials, made the digestion and discharged materials change from a solid-liquid mixture to a clear filtrate, and realized thermal hydrolysis. The effective separation of hydraulic retention time and solid retention time of sludge anaerobic digestion greatly improves the digestion retention time and conversion degree of solid organic matter, thereby reducing the amount of deep dewatering treatment of digested sludge, thereby avoiding the alkalinity of dehydration chemicals on the digestion filtrate. consumption.

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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