Secondary sludge thermal hydrolysis treatment method and device

Abstract

The invention provides a secondary sludge thermal hydrolysis treatment method and device. The secondary sludge thermal hydrolysis treatment method includes the steps that first step, steam is injected into a primary sludge pyrolysis kettle, stirring is performed to change sludge into pyrolysis slurry, and the pyrolysis slurry is discharged into a secondary slurry pyrolysis tank; second step, a lime agent is added into the secondary slurry pyrolysis tank in advance, and organic matter which is not easily hydrolyzed is further subjected to pyrolysis by the pyrolysis slurry under the effect of calcium hydroxide; third step, the pyrolysis slurry is cooled to ordinary pressure and the temperature of 100 DEG C. The secondary sludge thermal hydrolysis treatment method and the device have the advantages that the steam using amount is decreased by 40%, more soluble sugars and proteins are produced, the biodegradability of the thermal hydrolysis slurry can be improved from 0.25 to 0.54, the method does not adopt steam discharge and pressure relief, no bad smell is produced, the big and difficult problem of bad smell production in the sludge treatment process is solved, and the method saves the steam discharge time of a reaction kettle and is high in production efficiency compared with a traditional thermal hydrolysis process.

Description

technical field [0001] The invention relates to the technical field of municipal sludge treatment, in particular to a sludge secondary thermal hydrolysis treatment method and device. Background technique [0002] With the development of urbanization and the continuous improvement of people's living standards in my country, a large amount of municipal sludge is produced every day in cities and towns, which puts great pressure on the urban environment and sustainable development, and realizes the reduction and harmlessness of sludge. , Stabilization, and resource recovery must change the traditional method and adopt new technology and new technology to solve this urgent problem. The current sewage treatment plant uses activated sludge biochemical process to treat sewage. The activated sludge metabolized becomes sludge after sewage treatment. Therefore, municipal sludge is composed of a large number of cellular organic matter. These cells are composed of cellulose and Protected...

AI Technical Summary

Problems solved by technology

The current sewage treatment plant uses activated sludge biochemical process to treat sewage. The activated sludge metabolized becomes sludge after sewage treatment. Therefore, municipal sludge is composed of a large number of cellular organic matter. These cells are composed of cellulose and Protected by the cell wall of sugar components such as peptidoglycan, the organic matter and bound water in the cells are not easily separated and hydrolyzed, which makes the sludge disposal much more difficult.

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