Nitrogen and phosphorus removal device and method for simultaneously treating domestic sewage and nitrate wastewater by fully utilizing an internal carbon source

Abstract

The invention discloses a nitrogen and phosphorus removal device and method for simultaneously treating domestic sewage and nitrate wastewater by fully utilizing an internal carbon source, and belongs to the field of wastewater treatment. Sewage enters an AOA-SBR, anaerobic stirring is carried out, glycogen accumulating bacteria (GAOs) take in organic matter and store the organic matter as an internal carbon source (PHAs), and phosphorus accumulating bacteria (PAOs) store the PHAs and release phosphorus at the same time; the sewage enters a low-oxygen aeration stage (180 minutes), synchronous nitrification and denitrification is carried out, meanwhile, phosphorus uptake by PAOs is carried out, and denitrifying phosphorus removal is carried out by using nitrification products by denitrifying phosphorus-accumulating bacteria (DPAOs); nitrate wastewater with the same volume as discharged sludge is pumpedafter aeration, then an anoxic stage is enabled, denitrifying glycogen-accumulating bacteria (DGAOs) perform denitrification by using the internal carbon source, and perform endogenous denitrification by using the PHAs and NO3 <-> as an electron donor and an electron acceptor respectively, so as to achieve the purpose of deep nitrogen and phosphorus removal. The device is simple and easy to start, simple and convenient to operate, low in energy consumption, capable of treating domestic sewage and nitrate wastewater at the same time, good in nitrogen and phosphorus removal effect and low in sludge yield.

Description

technical field [0001] The invention relates to a device and a method for simultaneously treating domestic sewage and nitrate wastewater for denitrification and phosphorus removal by making full use of internal carbon sources, and belongs to the technical field of sewage biological treatment. Specifically, urban domestic sewage enters the AOA-SBR reactor for carbon storage and anaerobic phosphorus release reaction, then micro-aerobic aeration for simultaneous nitrification and denitrification and aerobic phosphorus uptake reaction, nitrogen and phosphorus removal at the same time, and then part of the phosphorus-rich sewage is discharged The mud is pumped into the nitrate wastewater, and the carbon source stored in the anaerobic section is used to denitrify the nitrate wastewater and denitrify the phosphorus to remove the aerobic incomplete phosphate, so as to make full use of the carbon source in the domestic sewage. By fully consuming carbon sources and reducing the growth r...

AI Technical Summary

Problems solved by technology

The invention proposes a method of pumping nitrate wastewater into nitrate wastewater after synchronous nitrification and denitrification phosphorus removal and before post anoxic and fully utilizing the internal carbon source stored by microorganisms to carry out endogenous denitrification denitrification and phosphorus removal, and reducing microbial The stored internal carbon source is lost, and the internal carbon source is used to treat nitrate wastewater, which solves the problems of insufficient carbon source utilization in the traditional biological nitrogen and phosphorus removal process, and the remaining carbon source releases phosphorus in the anoxic section, while reducing the sludge yield. It is more meaningful to achieve higher nitrogen and phosphorus removal efficiency of the system

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