Device and method for treatment of urban domestic sewage based on short-range denitrification and phosphorus removal coupled with anaerobic ammonia oxidation

Abstract

A device and method for treating urban domestic sewage based on short-range denitrification and phosphorus removal coupled with anaerobic ammonium oxidation belongs to the field of municipal domestic sewage treatment. The device includes a raw sewage tank, No. 1 SBR, an intermediate water tank, and No. 2 SBR. The method is: the domestic sewage first enters the No. 1 SBR, and the denitrifying phosphorus accumulating bacteria anaerobically releases phosphorus while absorbing the external carbon source in the sewage and converting it into an internal carbon source, and then discharges the effluent of the No. 1 SBR into the No. 2 SBR for short-range nitrification After the reaction, the effluent of No. 2 SBR is returned to No. 1 SBR to carry out short-range denitrification and phosphorus removal, anaerobic ammonium oxidation and endogenous short-range denitrification reaction, so as to realize the denitrification and phosphorus removal of urban domestic sewage. The dual-sludge system makes full use of the organic carbon source in the raw water without the need for an additional carbon source, saves aeration energy consumption, and reduces operating costs. It is a new cost-effective way to treat urban domestic sewage.

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. In the field of sewage treatment such as domestic sewage and industrial wastewater treatment, specifically, the urban domestic sewage is first entered into 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 nit...

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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 - )

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