Sewage disposal system with biological phosphorus removal and chemical phosphorus removal bypass and disposal method

Abstract

The invention discloses a system and a method for treating sewage with biological phosphorus removal and bypath chemical phosphorus removal. The system comprises a nitrogen-phosphorus removal subsystem and a bypath phosphorus removal subsystem, wherein the nitrogen-phosphorus removal subsystem is formed by connecting an anaerobic tank, an anoxic tank, an aeration tank, a sedimentation tank, a sludge return tank and a sludge return pump in turn, wherein the water outlet of the sludge return tank is connected to a sewage inlet of the anaerobic tank through a sludge return pump via pipelines; the bypath phosphorus removal subsystem is formed by connecting a mixing tank, an anaerobic phosphorus release sedimentation tank, a mixing reaction tank and a second sedimentation tank in turn; and the water outlet of the sludge return tank of the nitrogen-phosphorus removal subsystem is communicated with the water inlet of the mixing tank through the sludge return pump. The treatment system is simple in structure, organically combines the biological phosphorus removal with the chemical phosphorus removal, effectively solves the disadvantages that the biological phosphorus removal is low in efficiency and the pure chemical phosphorus removal remains high in operation cost, and has the advantages of good phosphorus removal effect and less medicament cost than the pure chemical phosphorus removal.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a 2 / O Sewage treatment system and treatment method combining biological phosphorus removal and nitrogen removal process with enhanced phosphorus removal or recovery process. Background technique [0002] Phosphorus is an important factor for eutrophication of water bodies, and it is also an element that has a nearly one-way cycle in nature. Due to the mining of phosphate rock and the almost one-way cycle of phosphorus in nature, phosphorus resources are increasingly depleted. Appropriate treatment technology and effective recovery methods can not only effectively control the eutrophication of water bodies, but also obtain available phosphorus resources, which is of great significance to prolong the service life of phosphorus rock resources. [0003] There are mainly three methods for removing phosphorus nutrients in the prior art, namely chemical methods, biological methods and ...

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Problems solved by technology

[0004] The embodiment of the present invention provides a sewage treatment system and treatment method with biological phosphorus removal and side channel chemical phosphorus removal. By organically combining biological phosphorus removal and chemical phosphorus According to the shortcomings of high phosphorus removal operation cost, it can achieve better phosphorus removal effect with lower cost

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