Sewage biological reaction tank and updated volume expansion method thereof

Abstract

The invention discloses a sewage biological reaction tank and an updated volume expansion method thereof. The sewage biological reaction tank comprises an activated sludge aerobic zone and a pretreatment zone, wherein a first anoxic / anaerobic tank and a second anoxic / anaerobic tank are arranged in the pretreatment zone, and the first anoxic / anaerobic tank is communicated with the second anoxic / anaerobic tank through a through hole in the bottom of a first partitioning wall to form an anoxic / anaerobic treatment zone; an MBBR (Moving Bed Biofilm Reactor) treatment tank is respectively arranged at each of two sides of the anoxic / anaerobic treatment zone, the second anoxic / anaerobic tank is communicated with the activated sludge aerobic zone through a through hole in the bottom of a corresponding second partitioning wall, and internal reflowing pipes are arranged on the second partitioning wall corresponding to the two MBBR treatment tanks. The invention further provides an updated volume expansion method. On the premise of keeping the volume of the original biological reaction tank unchangeable, a mud-water mixed solution in a CAST / CASS (Cyclic Activated Sludge System) main reaction region which does not reach a sufficient nitration rate originally needs to be lifted by an internal reflowing flow submersible sewage pump to enter the two added MBBR treatment tanks, thus the sewage treatment efficiency is increased.

Description

Technical field [0001] The invention relates to the field of sewage treatment, and in particular to a sewage biological reaction tank for upgrading and expansion using MBBR technology and a method for upgrading and expansion. Background technique [0002] The CAST process is an improvement of the SBR process, which continuously repeats the sewage treatment process in the order of water intake-drainage and aeration-non-aeration. CAST biological pool is divided into biological selection area, pre-reaction area and main reaction area, such as figure 1 Shown. [0003] The biological selection zone is a small area located in the front of the reaction tank. It is generally equipped with a mechanical stirring system and usually runs under anoxic / anaerobic conditions. The sewage entering the reaction tank is first fully mixed and contacted with the return sludge from the main reaction zone, and the soluble and easily degradable organic matter is quickly removed through the biological reac...

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Problems solved by technology

[0008] However, the volume of the biological pool in the prior art is insufficient or the load of influent pollutants increases, so that part of the influent ammonia nitrogen or organic pollutants cannot be fully oxidized in the aerobic zone of the activated sludge in the original pool, and the purpose of removing ammonia nitrogen and TN cannot be achieved. Repeated treatment is required many times, which greatly reduces the treatment efficiency of sewage

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