Method for coupling denitrifying dephosphatation and partial nitrification

Abstract

The invention discloses a method fpr coupling denitrifying dephosphatation and partial nitrification, and belongs to the field of municipal wastewater treatment. Firstly, raw water enters an (A / A / O)-SBR reactor; carbon pick-up synthesis polyhydroxyalkanoate (PHA) and phosphorus release reaction at an anaerobic phase are carried out; oxidation-reduction potential (ORP) is controlled at -30mv to -240mv; dissolved oxygen (DO) is smaller than or equal to 0.2mg / L, and then nitrifying reflux liquid containing NO2<-> from N-SBR is injected to carry out anaerobic denitrifying dephosphorization reaction; the ORP is controlled at -90mv to -210mv; the DO is smaller than or equal to 0.2mg / L. The flow of the nitrifying reflux liquid is adjusted at the stage according to the anaerobic phosphorus-release condition. The transient aeration, nitrogen stripping and aerobic phosphorus absorption are carried out after complete reaction; the DO is controlled to 2-3mg / L; sediments are stilled; discharged water enters the N-SBR reactor to carry out aerobic aeration. Nitration is controlled at a short-range stage through an 'ammonia valley' on a pH curve and an 'ammonia-nitrogen jump point' on a DO curve in the process; still deposition is carried out after the reaction is ended; a part of supernate is returned and the other part is discharged; the discharged water quantity is equal to the initial water inflow of the system. The denitrifying dephosphatation principle and the partial nitrification principle are applied, energy conservation and consumption reduction are achieved, and the method is applicable to a domestic wastewater with low C / N ratio, so as to achieve a synchronous and deep nitrogen and phosphorus removal effect.

Description

technical field [0001] The invention relates to a method for coupling denitrification phosphorus removal and short-range nitrification, belonging to the technical field of sewage treatment Background technique [0002] In terms of global water pollution control and treatment, organic pollution has been effectively controlled, and the problem of eutrophication caused by nutrients such as nitrogen and phosphorus has become increasingly serious, which has become the focus and difficulty of water pollution control. Biological treatment of sewage is widely used in various sewage treatment facilities due to economical and efficient reasons. Sewage treatment processes and technologies are difficult to achieve simultaneous deep nitrogen and phosphorus removal. [0003] The introduction and in-depth study of the denitrification and phosphorus removal theory have opened up new methods and ideas for the biological nitrogen and phosphorus removal of sewage, so that nitrogen and phospho...

AI Technical Summary

Problems solved by technology

[0005] A control method that couples denitrification phosphorus removal and short-range nitrification, uses real-time process control technology to optimize and regulate the reaction, and can reduce aeration energy consumption and solve problems such as insufficient carbon sources, while realizing simultaneous deep removal of nitrogen and phosphorus

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