Device and method for treating urban domestic waste water based on short-distance denitrifyingdephosphorization coupling anaerobic ammonia oxidation

Abstract

The invention discloses a device and method for treating urban domestic waste water based on short-distance denitrifying dephosphorization coupling anaerobic ammonia oxidation, and belongs to the field of municipal domestic waste water treatment. The device comprises a raw waste water tank, No.1 SBR, a middle water tank, No.2 SBR and the like. The method comprises the following steps of firstly, introducing the domestic waste water into the No.1 SBR, releasing phosphorus in an anaerobic stage by denitrifying phosphorusaccumulating bacteria, and simultaneously absorbing an external carbon source in the waste waterand converting the external carbon source into an internal carbon source; secondly discharging effluents of the No.1 SBR into the No.2 SBR and carrying out a short-distance nitrification reaction; and after the reaction is finished, enabling effluents of the No.2 SBR to return to the No.1 SBR and carrying out short-distance denitrifying dephosphorization, anaerobic ammonia oxidation and an endogenous short-distance denitrificationreaction so as to realize the denitrifying dephosphorization of urban domestic waste water. A two-sludge system takes full advantage of an organiccarbon source in raw water, an extra carbon source is not needed, energy consumption of the aeration is saved, the operating cost is reduced, and the method is a new, economic and efficient method for treating the urban domestic waste water.

Description

technical field [0001] The invention relates to a device and method for treating urban domestic sewage based on short-range denitrification and phosphorus removal coupled with anaerobic ammonium oxidation, which belongs to the field of municipal domestic sewage treatment. Domestic sewage and industrial wastewater treatment and other sewage treatment fields, specifically, urban domestic sewage first enters the No. 1 SBR, and the denitrifying phosphorus-accumulating bacteria in the No. 1 SBR release phosphorus under anaerobic conditions while absorbing external carbon sources in the sewage for transformation It is the internal carbon source PHA, and then the supernatant is discharged into the first intermediate water tank after static precipitation, and the water in the first intermediate water tank enters the No. 2 SBR. In the No. 2 SBR, a short-range nitrification reaction is carried out. When DO is 0.5-1.5mg / L, ammonia nitrogen (NH 4 + ) into nitrite nitrogen (NO 2 - ), a...

AI Technical Summary

Problems solved by technology

[0008] At the same time, it must be noted that although the anaerobic ammonium oxidation process is a new type of biological denitrification process, compared with the traditional process, it has many advantages such as no support, organic carbon source, and less residual sludge. It is currently recognized as the most Economical and efficient sewage biological denitrification technology, but anaerobic ammonium oxidation also has some difficulties in engineering application, such as difficulty in stable retention in urban sewage treatment plants, slow growth rate, and difficulty in obtaining substrate nitrite substrates, etc. Generally, in the process of anammox reaction, the acquisition of nitrite substrate is usually obtained through short-range nitrification, and the realization of short-range nitrification is mainly suppressed or elutriated by strategies such as limiting dissolved oxygen, suppressing free ammonia, and high-temperature operation. NOB, so that the nitrification reaction only proceeds to nitrite nitrogen (NO 2 - ) This step does not continue to oxidize to nitrate nitrogen (NO 3 - )

Images