Sludge hydrolysis acidification system using membrane bioreactor

Abstract

The invention discloses a sludge hydrolysis acidification system using a membrane bioreactor and relates to the technical field of sludge hydrolysis acidification and hydrolysate separation in sewage treatment plants. A sludge discharge outlet of a sludge hydrolysis acidification tank is connected with a feed inlet of a membrane inlet screw pump, a concentrated solution discharge port of a membrane module is connected to the inside of the sludge hydrolysis acidification tank, a diffusate discharge port of the membrane module is connected with a hydrolysis acidizing fluid discharge pipe, and a discharge port of a line cleaning system is connected to the inside of a stainless steel membrane casing of the membrane module through a dosing pump. According to the sludge hydrolysis acidification system using the membrane bioreactor, the reacted sludge enters the membrane module through the membrane inlet screw pump, a hydrolysis acidizing fluid is obtained at a port of the hydrolysis acidizing fluid discharge pipe and then enters a next treating procedure, a concentrated solution of the membrane module flows back into the sludge hydrolysis acidification tank, and higher microorganism concentration in the tank is continuously maintained. By means of the line cleaning system, service life of the membrane module can be prolonged, and membrane flux of the membrane module can be improved.

Description

technical field [0001] The invention relates to the hydrolysis acidification of sewage treatment plant sludge and the separation of hydrolyzate, in particular to the application of a membrane bioreactor in sludge hydrolysis acidification and its system device. Background technique [0002] Sludge is a by-product produced in the process of sewage treatment in urban sewage treatment plants. There is a phenomenon of "heavy water and light mud" in the construction of urban sewage treatment plants in my country. Most of the sludge has not been treated safely and reasonably. [0003] The hydrolysis and acidification treatment of sludge is to treat sludge in a biochemical way, which utilizes the hydrolysis and acidification stage in anaerobic digestion of sludge. acid, which improves the dehydration and stability of the sludge, destroys and controls the pathogenic microorganisms in the sludge, reduces the volume of the sludge, and lays the foundation for the subsequent further use ...

AI Technical Summary

Problems solved by technology

[0005] The centrifugal separation method is to pump the mud-water mixture after hydrolysis and acidification into the centrifuge, and realize the separation of mud and water under the action of centrifugal force, but the centrifuge cannot realize continuous separation, and there are certain requirements on the concentration of the incoming mud, which is difficult when sludge compaction occurs. Cleaning, and in order to improve the separation efficiency, its power consumption will increase

[0006] The filter cloth filtration method is to pass the sludge through the filter cloth bag filter, the sludge remains in the cloth bag, and the hydrolysis and acidification liquid is separated through the gaps of the filter cloth. When the filter cannot be filtered for a period of time, the sludge accumulated on the filter cloth needs to be Manual cleaning, poor operating conditions, and low separation efficiency, not suitable for mud-water separation

[0007] The plate-and-frame filter press method is to pump the mud-water mixture into the plate-and-frame filter press for mud-water separation. The sanitation conditions of this method are poor, because the sludge is a mud liquid after a biochemical reaction and has a high viscosity, resulting in low separation efficiency. In addition, the separated hydrolysis and acidification solution is easily polluted, and the subsequent mud cake is difficult to clean up

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