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

Abstract

The invention discloses a system and a method for treating sewage through biological phosphorus removal combined with bypath chemical phosphorus removal. The system comprises a biological nitrogen-phosphorus removal subsystem 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 system also comprises a bypath chemical phosphorus removal subsystem formed by connecting a phosphorus release sludge sedimentation tank, a mixing reaction tank, a second sedimentation tank and a reflow well in turn; the water outlet of the anaerobic tank of the biological nitrogen-phosphorus removal subsystem is communicated with the phosphorus release sludge sedimentation tank of the bypath chemical phosphorus removal subsystem through the pipelines; and the reflow well of the bypath chemical phosphorus removal subsystem is connected to the anoxic tank through the pipelines. The system has the advantages that the system is simple in structure, organically combines the biological phosphorus removal with the chemical phosphorus removal, and effectively solves the disadvantages of low efficiency on the biological phosphorus removal and high operating cost in 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 three main methods for removing phosphorus nutrients in the existing technology, namely chemical method, biological metho...

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Problems solved by technology

[0004] The embodiment of the present invention provides a sewage treatment system and treatment method that relies heavily on the combination of biological phosphorus removal and side channel chemical phosphorus removal. By organically combining biological phosphorus removal and chemical phosphorus Phosphorus operating cost is high according to the shortcomings, so as to achieve better phosphorus removal effect with lower cost

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