A sewage treatment tank and treatment process

Abstract

The invention relates to a sewage treatment tank and a treatment process. The treatment tank comprises a sedimentation tank and a degradation tank, the degradation tank is a tank body wrapped by tank walls and compartment walls arranged in the tank body in parallel, the tank body is divided into a fluid passage distributed in an S shape by the compartment walls, then, a partition wall vertical to the compartment walls is arranged in the fluid passage, and the fluid passage is sequentially divided into a regulation zone, an anoxic zone, an anaerobic zone and an aerobic zone; the regulation zone and the aerobic zone are separately communicated with the sedimentation tank, the regulation zone is provided with a sewage inlet pipe, and the middle of the aerobic zone is communicated with the regulation zone through a return pipe. Compared with the prior art, the sewage treatment tank and the treatment process add a regulation zone before the anoxic zone, the oxygen concentration in sewage flowing into the anoxic zone is ensured to be 0.3-0.4mg / L, and the effect of denitrification is enhanced; a controller is added, the quantity demanded by sludge and changes in oxygen concentration in the regulation zone can be automatically sensed, then, a sludge pump and an air blower are controlled to open and close and the flow quantity is controlled, and therefore the functions of sludge rate and oxygen concentration automatic regulation are achieved, and the treatment process is more automated.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment pool and a treatment process. Background technique [0002] With the rapid development of the economy, the phenomenon of water pollution is becoming more and more serious, especially the large discharge of nitrogen and phosphorus, which causes the eutrophication of water bodies. In the sewage treatment process, the one with better nitrogen and phosphorus removal effect is A 2 O (anaerobic-anoxic-aerobic) process, used for secondary sewage treatment or tertiary sewage treatment and reuse of reclaimed water. A 2 The flora of the O biological nitrogen and phosphorus removal system is mainly composed of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria. In the aerobic section, nitrifying bacteria convert the ammonia nitrogen and organic nitrogen in the inflow into nitrate through biological nitrification; in the anoxic sect...

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Problems solved by technology

[0003] However, no matter in the anoxic zone, anaerobic zone or aerobic zone, the bacteria inside need to attach to the sludge, and each zone has a high requirement for oxygen concentration, and the oxygen concentration in the anoxic zone is between 0.2 and 0.5 mg / L, even between 0.3 and 0.4mg / L, the oxygen concentration in the anaerobic zone is below 0.2mg / L, and the oxygen concentration in the aerobic zone is 2mg / L or above. It can be seen that the oxygen concentration in the anoxic zone The concentration range is relatively narrow, once adjusted improperly, the denitrification effect will be greatly reduced

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