Excess sludge pretreatment device and pretreatment method

Abstract

The invention discloses an excess sludge pretreatment device and a pretreatment method. The pretreatment device comprises a variable-frequency power source, surface sterilization alloy corrugated plates assembly and an insulating box body; adjacent two surface sterilization alloy corrugated plates are respectively connected with positive and negative output ends of the variable-frequency power source; all surface sterilization alloy corrugated plates are arranged at equal intervals in parallel in the insulating box body; and two ends of the insulating box body are provided with pipe joints, and excess sludge enters the insulating box body from one end of the insulating box body and flows out from the other end of the insulating box body. According to the invention, through selective sterilization, the biodegradability of the excess sludge is significantly improved, and also useful facultative microorganisms in the excess sludge are reserved, and promote hydrolysis and acidification andanaerobic digestion in a subsequent hydrolysis acidification and anaerobic digestion process.

Description

technical field [0001] The invention relates to the technical field of excess sludge treatment, in particular to an excess sludge pretreatment device and a pretreatment method. Background technique [0002] At present, excess sludge is an inevitable subsidiary product of sewage biochemical treatment process. Due to its high perishability, high organic matter content, large amount of pathogenic microorganisms and heavy metals harmful to human body, if it is not properly treated and directly enters the natural environment, it will seriously damage The natural environment, pollute groundwater, and cause great harm to human health. Every time 10,000 tons of sewage is treated, 5-8 tons of excess sludge with a water content of 80% will be produced. According to statistics, tens of millions of tons of excess sludge will be produced in my country every year. [0003] At present, the country's overall requirements for excess sludge treatment are reduction, stabilization, harmlessnes...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide an excess sludge pretreatment device and pretreatment method, which solves the problem that the existing excess sludge pretreatment cannot be selectively sterilized. During the pretreatment of the excess sludge, the plate is selectively sterilized to kill the microorganisms on the surface of the excess sludge bacteria micelles, while the microorganisms inside the bacteria micelles are not affected

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