Hydroxylamine/ferrous ion-enhanced PNA integrated SBBR deep denitrification method for domestic sewage

Abstract

The invention discloses a hydroxylamine / ferrous ion-enhanced PNA integrated SBBR deep denitrification method for domestic sewage, belonging to the field of sewage treatment. A system used in the method comprises a water inlet tank, an SBBR reactor and a water outlet tank. The SBBR adopts polypropylene plastic ring filler, and has a filling rate of about 20%. A microporous aeration disc is arrangedat the bottom of the SBBR, and an aeration pump is connected with a gas rotor flow meter to control the gas inflow of the system. Domestic sewage enters the SBBR through a peristaltic pump; hydroxylamine is added in an aerobic aeration stage, so NOB can be effectively inhibited, and the short-cut nitrification phenomenon of the urban domestic sewage is rapidly achieved and stably maintained; andferrous ions are added in an anoxic stirring stage, so enrichment of Anammox bacteria in the system is promoted, and the activity of the Anammox bacteria is improved. In the system, the NOB which competes with the Anammox bacteria for a nitroso matrix in the system is further inhibited, and AOB and Anammox which play a main role in denitrification are in a high-activity state, so the stable operation of the PNA integrated SBBR system is ensured. The system is simple in structure, high in operability and capable of saving energy and reducing consumption, and does not need an external carbon source.

Description

technical field [0001] The method for deep denitrification of domestic sewage enhanced by hydroxylamine and ferrous ions through PNA integrated SBBR belongs to the technical field of sewage biological treatment and is suitable for denitrification treatment of urban domestic sewage with low carbon-to-nitrogen ratio. Background technique [0002] Excessive discharge of nitrogen in domestic sewage is one of the important reasons for water hypoxia, damage to water ecological environment and eutrophication. The traditional nitrification and denitrification denitrification process requires additional carbon sources and consumes a large amount of oxygen. For domestic sewage with a low carbon-to-nitrogen ratio, not only the treatment cost is high, but also the sludge production will increase. Using PNA integrated SBBR process to denitrify domestic sewage with low carbon nitrogen ratio is a more suitable solution. [0003] PNA integrated technology has become one of the research hot...

AI Technical Summary

Problems solved by technology

The traditional nitrification and denitrification denitrification process requires additional carbon sources and consumes a large amount of oxygen. For domestic sewage with a low carbon-to-nitrogen ratio, not only the treatment cost is high, but also the sludge production will increase.

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