Device and method for acid production by anaerobic and low dissolved oxygen hydrolysis and fermentation of excess sludge

Abstract

The invention discloses a device and a method for acid production by anaerobic and low dissolved oxygen hydrolysis and fermentation of excess sludge. The device comprises a nitrogen machine, an excess sludge hydrolysis and fermentation reactor, an air compressor, an excess sludge acid production reactor and a carbon source storage pool, wherein the excess sludge hydrolysis and fermentation reactor is a sealed pool, and is provided with a sludge feeding pipe, a stirrer and a fermentation liquor output pipe; the excess sludge acid production reactor is a sealed pool and is provided with a fermentation liquor input pipe, a stirrer and a carbon source output pipe; the carbon source storage pool is an open pool, and is provided with a water discharging pipe and a sludge discharging pipe. The method comprises the following steps that the excess sludge firstly is conveyed into the hydrolysis and fermentation reactor, cell walls are broken down and macromolecule organics are released, and the macromolecule organics are converted into micromolecule organics under the action of hydrolysis and ferment bacteria; then, micromolecule organics are conveyed into the acid production reactor, and under the action of acid-producing bacteria, the micromolecule organics are converted into short chain fatty acids (SCFAs); after that the short chain fatty acids are conveyed into the carbon source storage pool; all the steps are repeated, and finally, the SCFAs can be produced efficiently for a long time.

Description

technical field [0001] The invention relates to an anaerobic + low dissolved oxygen residual sludge hydrolysis fermentation acid production device and method, and belongs to the technical field of sludge sewage treatment. Background technique [0002] Activated sludge method is currently an effective way to treat urban domestic sewage. However, due to insufficient biologically available carbon sources in sewage, the effect of biological nitrogen and phosphorus removal is not good, and the effluent is difficult to meet the first-class A discharge standard. In order to improve the efficiency of biological nitrogen and phosphorus removal, it is necessary to add carbon sources. One of the ways is to add chemically synthesized carbon sources. However, this method will undoubtedly increase the operating cost of the water plant. On the other hand, a large amount of excess sludge will be produced due to the continuous proliferation of sludge in the process of activated sludge treatm...

AI Technical Summary

Problems solved by technology

At present, there are ultrasonic, microwave, pyrolysis, enzymatic, surfactant methods, etc. to promote the acid production of excess sludge by anaerobic hydrolysis acidification. However, these technologies have low acid production efficiency, long time required for acid production, and high operating costs. problem, it is difficult to apply to the actual sewage treatment plant

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