Process of treating low cn ratio domestic sewage by anaerobic/aerobic sndpr system enriched with phosphorus accumulating bacteria

Abstract

The invention provides a process for treating domestic sewage with low CN (Carbon-Nitrogen) ratio by use of an anaerobic / aerobic SNDPR (Simultaneous Nitrification and Denitrification Phosphorus Removal) system capable of enriching phosphorus-accumulating bacteria and belongs to the field of biological sewage treatment. After the domestic sewage enters into an SNDPR SBR (Sequencing Batch Reactor), delayed anoxic / anaerobic stirring is carried out firstly, nitrogen removal by denitrification is performed on NO3<-1>-N and NO2<-1>-N left in last cycle by use of denitrifying bacteria and by utilizing organic carbon sources in the sewage, the anaerobic phosphorus release is realized by use of the phosphorus-accumulating bacteria and by utilizing the organic carbon sources in the sewage, and stored substances are synthesized in the cells of the phosphorus-accumulating bacteria. Due to delayed anaerobic treatment, after PAOs phosphorus release is finished, the denitrifying flora in the system is still capable of taking full advantage of organic matters in the sewage and storing the organic matters as an internal carbon source. Hereafter, aerobic aeration stirring is performed; as the concentration of dissolved oxygen is controlled, endogenous SNDPR of the denitrifying flora can be realized while phosphorus absorption of the phosphorus-accumulating bacteria is guaranteed. The method process for treating the domestic sewage with low CN ratio by use of the anaerobic / aerobic SNDPR system capable of enriching phosphorus-accumulating bacteria has the advantages that deep nitrogen and phosphorus removal of the sewage with low CN ratio is realized in one reactor, the process is simple, no external carbon source needs to be added, and the oxygen consumption and the energy consumption are reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a process and method for treating low CN ratio domestic sewage by an anaerobic / aerobic SNDPR system enriched with phosphorus accumulating bacteria Background technique [0002] With the improvement of human living standards, the rapid growth of population, and the rapid development of industry, the discharge of sewage is increasing day by day, and the pollution of water environment is becoming more and more serious. The denitrification and phosphorus removal of sewage has become a hot spot for experts and scholars at home and abroad. At the same time, as land and energy issues become increasingly prominent, the demand for low-energy and high-efficiency sewage treatment technologies is becoming more and more urgent. Simultaneous nitrification and denitrification (SDN) process can greatly reduce oxygen consumption and energy consumption, so SDN process is gradually attracting attent...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process and method for treating low-CN ratio domestic sewage by an anaerobic / aerobic SNDPR system enriched in phosphorus-accumulating bacteria, so as to realize the deep denitrification and phosphorus removal of domestic sewage with low carbon-to-nitrogen ratio, and solve the problem of traditional denitrification and denitrification. In the phosphorus process, there are problems such as insufficient carbon source, poor phosphorus removal effect, and the inability to achieve good coexistence of nitrogen and phosphorus removal under the same conditions at the same time. The process is simple, saves aeration, and reduces operating costs

Images