Method and System for Phosphorus and Nitrogen Removal in Sewage

Abstract

The invention discloses a method and system for removing phosphorus and nitrogen from sewage, belonging to the field of sewage treatment. The method includes: pretreatment: making the sewage enter the pretreatment unit for pretreatment, removing large suspended solids in the sewage, and adjusting the sewage from which the suspended solids have been removed; biological phosphorus removal treatment: making the effluent after the above pretreatment enter the Biological phosphorus removal and organic matter removal are carried out in the biological phosphorus removal unit; biological autotrophic denitrification treatment: the effluent after the above biological phosphorus removal treatment enters the biological autotrophic denitrification unit, and passes through the The autotrophic metabolism of anammox bacteria in the bioautotrophic denitrification unit removes nitrogen in sewage, and the effluent from the bioautotrophic denitrification unit is used as regenerated water for phosphorus and nitrogen removal. The method has short technological process, good phosphorus and nitrogen removal effects, and low cost.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method and system for removing phosphorus and nitrogen from sewage. Background technique [0002] The more economical wastewater phosphorus removal process generally recognized internationally is the anaerobic phosphorus release / aerobic phosphorus uptake biological phosphorus removal process. This process can achieve the purpose of deep phosphorus removal and organic matter removal without increasing the investment and operating costs of traditional activated sludge sewage treatment facilities. It has the advantages of small reactor volume and good phosphorus removal effect. However, like the traditional activated sludge method, problems such as sludge bulking are still prone to occur, which will cause the sludge settling effect of the secondary settling tank to deteriorate, the concentration of SS in the effluent will increase, and even phosphorus removal due to serious sludge ...

AI Technical Summary

Problems solved by technology

[0004] Based on the problems existing in the above-mentioned prior art, the embodiment of the present invention provides a method and system for removing phosphorus and nitrogen from sewage, which solves the problems of long process flow, unreasonable unit collocation, high investment and operating costs in the existing sewage regeneration treatment technology. The problem is that when avoiding the use of biological phosphorus removal and nitrogen removal, phosphorus removal bacteria and nitrogen removal bacteria contradict and compete with each other, so as to achieve energy saving and consumption reduction under the premise of ensuring that the effluent water quality is stable and meets the reuse standard of reclaimed water

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