Reinforced simultaneous nitrogen and phosphorus removal sewage treatment equipment and method for municipal sewage with low carbon source at low oxygen concentration

Abstract

The invention provides reinforced simultaneous nitrogen and phosphorus removal sewage treatment equipment and a method for municipal sewage with a low carbon source at low oxygen concentration. The equipment is composed of an SBR main reaction tank and two dephosphorizing tanks, wherein, the water inlet pipe of the SBR main reaction tank is led in from the upper part of the reaction tank, the water outlet pipe thereof is led out from the lower part of the reaction tank, and an external circulation sludge pipe is led out from the bottom of the SBR main reaction tank; the SBR main reaction tank is equipped with an aerating apparatus; and the SBR main reaction tank adopts an operation mode of water inflow in batches, and anaerobic-aerobic/anoxic alternation and sedimentation and drainage. The two dephosphorizing tanks have identical structure size and are respectively taken as an anaerobic phosphorus release tank and a chemical dephosphorizing tank in the same cycle for sewage treatment, and functions of the two tanks are exchanged in the next cycle. The invention can well realize reinforced simultaneous nitrogen and phosphorus removal treatment for the municipal sewage with a low carbon source under a low dissolved oxygen environment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and particularly relates to a step-by-step SBR sewage treatment device and method for strengthening the denitrification and dephosphorization of low-carbon source sewage under low-oxygen conditions, which is suitable for synchronous dephosphorization and denitrification of urban low-carbon source sewage. Background technique [0002] With the aggravation of water eutrophication, how to ensure the removal effect of phosphorus and nitrogen in urban sewage treatment has become an unavoidable problem. However, the competition of carbon sources and the contradiction of sludge age in the simultaneous biological nitrogen and phosphorus removal sewage treatment system make it difficult for urban sewage treatment plants to obtain excellent phosphorus and nitrogen removal effects at the same time. Especially in some southern cities, the average COD concentration of domestic sewage is lower than 20...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many researches on the development and research of effective denitrification technology for low-carbon source sewage, but there are few research reports on the enhanced simultaneous phosphorus and nitrogen removal for low-carbon source urban sewage

When dealing with low-carbon source urban sewage, the traditional treatment methods mainly face the following problems: (1) The large amount of aeration required for the nitrification process and the lack of organic carbon sources for denitrification

In the traditional SBR process, the sewage enters the reactor at one time, and the organic matter and ammonia nitrogen need to go through the aerobic and anoxic reaction stages of the entire cycle. When the aeration starts, the heterotrophic bacteria will preferentially use the dissolved oxygen to oxidize and decompose the organic matter. There is no advantage in the competition, so it is necessary to increase the aeration rate to ensure the nitrification effect; and in this high dissolved oxygen environment, the organic matter in the system will be over-oxidized, resulting in the lack o

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