Multiunit sewage treatment system and method

Abstract

The invention discloses a multiunit sewage treatment system and method. The system comprises a hydrolytic acidification device, an anaerobic reactor, a sludge treatment device, an activated sludge reactor and an aeration biofilter. The hydrolytic acidification device comprises a hydrolytic acidification tank, a first sedimentation tank, a first overflow weir and an overflow pipe. The anaerobic reactor comprises a cylinder, a three-phase separator and an internal circulation device. The sludge treatment device comprises a second sedimentation tank, a second overflow weir, a water inlet pipe and a dissolved oxygen meter. The second overflow weir is communicated with the hydrolytic acidification tank through a return pipe. The water inlet pipe is provided with a jet flow hole and a regulating valve. The jet flow hole is formed in the sludge treatment device to regulate the amount of dissolved oxygen at the reaction liquid level, it is guaranteed that nitrite is generated after a reaction, and the formed nitrite flows back into the hydrolytic acidification tank, so that excessively high acidity of acidized sewage is avoided, and the overall sewage treatment efficiency is improved; sludge and sewage formed after the reaction are treated through the activated sludge reactor and the aeration biofilter respectively, so that the sewage treatment efficiency and degrading efficiency are improved.

Description

technical field [0001] The invention relates to sewage treatment technology, in particular to a multi-unit sewage treatment system and method. Background technique [0002] Conventional anaerobic sludge reactors include UASB, EGSB, IC, etc. The principle of wastewater treatment is basically that the sewage to be treated is introduced into the reactor as evenly as possible, and the sewage entering the reactor is mixed with granular or flocculent sludge The contact reaction occurs, and part of the biogas (mainly methane and carbon dioxide) produced by the reaction adheres to the sludge, moves upward with the biogas, and hits the three-phase separator to realize the three-phase separation of solid, liquid and gas. The mixture of sewage and sludge treated in the anaerobic sludge reactor is generally treated with ammonia nitrogen through the SBR reactor. [0003] However, in the actual application process, the anaerobic sludge reactor needs to be treated by hydrolysis and acidif...

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Problems solved by technology

[0003] However, in the actual application process, the anaerobic sludge reactor needs to be treated by hydrolysis and acidification before, and the hydrolysis and acidification treatment will easily lead to high acidity of sewage, thereby inhibiting the growth of methane bacteria in the anaerobic sludge reactor, which is not conducive to anaerobic sewage treatment. Increased treatment efficiency of effluent in the sludge reactor, which in turn leads to lower overall treatment efficiency

Although it can be solved by adjusting the pH value in the process of hydrolysis and acidification to reduce the acidity, it will easily lead to an increase in production costs, which is not conducive to the reduction of sewage treatment costs.

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