Alternative biochemical pond, sewage treatment method and sewage treatment system

Abstract

The invention discloses an alternative biochemical pond which comprises a middle pond, a side pond I, a side pond II and an anaerobic pond, wherein, the side pond I, the middle pond and the side pond II are symmetrically provided with two sets of water collecting and distributing device which comprises a central water collecting and distributing drum, a stabilizing feed well and a water collecting and distributing pipe. A sewage treatment method comprises the following steps that: S1, the side pond I carries out anoxic or aerobic treatment, the middle pond carries out aerobic treatment, and the side pond II carries out vertical flow sedimentation; and S2, the side pond II carries out anoxic or aerobic treatment, the middle pond carries out aerobic treatment, and the side pond I carries out vertical flow sedimentation. A sewage treatment system comprises the alternative biochemical pond and further comprises a grating drain, a sand basin, a sludge dehydration device and a contact disinfection pool. According to the invention, the phenomena of appearance of a dead zone and instable discharging of water in a biochemical pond are avoided, water conditions are improved, energy consumption in sewage treatment and maintenance cost for a sewage treatment plant are reduced, a utilization rate of capacity of the biochemical pond is improved, and cost for sewage treatment is reduced.

Description

technical field [0001] The invention relates to an alternate biochemical pool, a sewage treatment method and a sewage treatment system, in particular to an alternate biochemical pool provided with a water collecting and distributing device, a treatment method for the alternate biochemical pool, and sewage including the alternate biochemical pool A treatment system belongs to the technical field of sewage treatment. Background technique [0002] With the acceleration of urbanization and industrialization in our country, the demand gap of water resources is also increasing day by day; at the same time, in order to improve the quality of water body and the environment of people's living and living, the development of sewage treatment technology has been paid more and more attention by people. In the sewage treatment system, the alternating biochemical tank for sewage treatment is an alternating biological treatment tank. The sewage treatment process of the alternating biochemic...

AI Technical Summary

Problems solved by technology

[0006] In the sewage treatment process of the above-mentioned alternating biochemical pool, since side pool one distributes water to the middle pool and side pool two collects water from the middle pool, it is realized through the bottom channel 10 or the hole provided on the pool wall and the plug-flow submersible mixer 12 , the water intake point and the water outlet point are relatively concentrated, so the dead zone and unstable water outlet are prone to appear in the biochemical pool, thus affecting the sedimentation effect

In the prior art, in order to improve water conservancy conditions and prevent dead zones, a large number of submersible plug flow mixers 12 are installed at the bottom of the existing alternating biochemical pools, which increases the operating energy consumption of the sewage treatment system and makes maintenance more difficult. The cost is also greatly increased, which is not conducive to saving energy and reducing sewage treatment costs

In addition, when sewage treatment does not require denitrification treatment, the existing alternating biochemical tank must have a static period before the side tank settles, that is, before the side tank enters the sedimentation stage, the water must be stopped for a period of time, so that the alternating The utilization rate of the pool capacity of the type biochemical pool is greatly reduced, which affects the efficiency of sewage treatment

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