Biological sewage reaction system and upgrading and expanding method

Abstract

The invention discloses a biological sewage reaction system and an upgrading and expanding method. The biological sewage reaction system comprises a biological sewage reaction tank; an anoxic activated sludge region, an anoxic / anaerobic activated sludge region and an anoxic / aerobic transition region are sequentially communicated, an MBBR (Moving Bed Biofilm Reactor) treatment region is communicated with an aerobic activated sludge region through a perforation in the bottom of a partition wall, and the MBBR treatment region is communicated with a pure aerobic activated sludge region through an effluent screen mesh; the anoxic / aerobic transition region is communicated with the aerobic activated sludge region, and the pure aerobic activated sludge region is communicated with the anoxic activated sludge region through an internal reflux submersible sewage pump; the pure aerobic activated sludge region is communicated with a secondary sedimentation tank through a pipeline, and the secondary sedimentation tank is communicated with the anoxic activated sludge region through a return pipeline. The traditional CAST (Cyclic Activated Sludge Technology) / CASS (Cyclic Activated Sludge System) biological tank is modified, and therefore, on the premise that the modifying cost is reduced, the capacity for removing total nitrogen (TN) and total phosphorus (TP) organisms in the tank is effectively improved, the pollution load (expanding) treatment capacity is improved, and the sewage treatment efficiency is increased.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage biological reaction system and a method for upgrading and expanding the capacity of a CAST / CASS biological pool using MBBR technology and a newly built secondary settling tank for upgrading and expanding the capacity. Background technique [0002] The CAST / CASS process is an improved process of the traditional SBR process. Generally, the CAST / CASS reaction pool is divided into a biological selection area and a main reaction area. When applying the modified process, a sewage treatment plant has at least two sets of CAST / CASS biological reaction pools. ,Such as figure 1 As shown, but most of the plants are built four sets of pools running in parallel. [0003] The biological selection zone of the CAST / CASS biological reaction tank is a small area located in the front of the reaction tank, generally equipped with a mechanical stirring device, and usually operates under anox...

AI Technical Summary

Problems solved by technology

The main methods of actually expanding and upgrading the enhanced biological treatment are as follows: ① Increase the number and activity of effective microorganisms in the system, and increase the number of working microorganisms in the system mainly by adding biofilm carriers in the biochemical section to increase the sludge concentration; The activity of microorganisms mainly refers to the effective removal of ammonia nitrogen and TN by increasing the activity of nitrifying bacteria and denitrifying bacteria by adding an anoxic stirring zone. processing cost

②Increase the effective working time of microorganisms in the system, which mainly refers to adjusting the operation cycle, that is, improving the utilization rate of the pool capacity, but it takes a lot of time and reduces the efficiency of sewage treatment

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