A2O2-MBR sewage treatment process and device

Abstract

The invention provides an A2O2-MBR sewage treatment process. The A2O2-MBR sewage treatment process includes the following steps that firstly, sewage is input to an anaerobic tank, and phosphorous release and rapid ammoniation are finished in the anaerobic tank; secondly, water in the anaerobic tank is input to an anoxic tank, and nitrogen removal by denitrification is finished in the anoxic tank; thirdly, water in the anoxic tank is input to an aerobiotic tank, and degradation, denitrification and phosphorous absorption of BOD are finished in the aerobiotic tank; fourthly, water in the aerobiotic tank is input to a settling tank, and mud-water separation is finished in the settling tank; fifthly, supernatant liquor generated in the settling tank is input to an ozone preoxidation zone in an MBR reaction tank; sixthly, water in the ozone preoxidation zone in the MBR reaction tank is input to an MBR reaction zone in the MBR reaction tank. The invention further discloses an A2O2-MBR sewage treatment device. The A2O2-MBR sewage treatment process and device have the advantages that the flow is simplified, the occupied area is small, and the treatment effect is efficient and stable.

Description

technical field [0001] The invention relates to sewage treatment, in particular to an A2O2-MBR sewage treatment process and its device in sewage treatment. Background technique [0002] Anaerobic-anoxic-aerobic (AAO) combined process system is a sewage treatment process system that has been widely used. It is composed of three-stage biological treatment devices. The difference from the single-stage AO process is that an anaerobic reactor is installed in the front stage, which aims to degrade and remove some refractory organic substances in wastewater through anaerobic process, thereby improving wastewater. biodegradability, and provide a carbon source suitable for the denitrification process for the subsequent anoxic stage, and finally achieve the purpose of efficiently removing COD, BOD, N, and P. This process can be called the simplest simultaneous denitrification and dephosphorization process systematically, and has a series of advantages. Firstly, its total hydraulic r...

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Problems solved by technology

[0003] However, due to the improvement of urban sewage treatment and discharge standards, the efficiency of nitrogen and phosphorus removal cannot be further improved due to the bottleneck of the traditional activated sludge process. The traditional AAO process cannot meet the discharge standards. It is urgent to carry out research on new processes with high efficiency and low consumption.

In addition, steady state is a necessary condition to ensure that the effluent quality is stable and below a certain standard. Most of the existing sewage treatment plants are facing the pressure of increasing treatment capacity and upgrading.

At the same time, the traditional mud-water separation process is completed in the secondary settling tank, and the content of suspended solids in the effluent is significantly affected by the mud-water separation effect, and the secondary settling tank occupies a large area, which makes it difficult to adapt to the increasingly scarce urban land resources.

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