Technology for treating domestic sewage by realizing partial short-cut nitrification, sludge fermentation coupling denitrification and anaerobic ammonia oxidation in sequencing batch reactor

Abstract

The invention discloses a technology for treating domestic sewage by realizing partial short-cut nitrification, sludge fermentation coupling denitrification and anaerobic ammonia oxidation in a sequencing batch reactor, and belongs to the field of the sewage sludge biological treatment. The technology comprises an inlet water tank, a partial short-cut nitrification reactor (PN-SBR), an intermediate water tank, an anaerobic ammonia oxidation coupling sludge fermentation and denitrification reactor (ASFD-SBR), and an outlet water tank. The partial short-cut nitrification is performed in the partial short-cut nitrification reactor (PN-SBR), and a part of ammonia nitrogen in raw water is converted to nitrite nitrogen. The influent ammonia nitrogen and the nitrite nitrogen are converted to a nitrogen gas and a little of nitrate nitrogen by anaerobic ammonium oxidation bacteria in the anaerobic ammonia oxidation coupling sludge fermentation and denitrification reactor (ASFD-SBR), and the generated nitrate nitrogen is reduced to the nitrogen gas by a carbon source generated by sludge fermentation, wherein static bed filler is used for retaining the anaerobic ammonium oxidation bacteria, and denitrification and sludge fermentation processes are performed in floc sludge. The technology is capable of saving energy consumption, and simultaneously realizing the deep denitrification of theurban domestic sewage in a low carbon nitrogen ratio (C / N) and the recycling of the sludge.

Description

technical field [0001] The invention discloses a technology for realizing partial short-range nitrification, sludge fermentation coupling denitrification and anaerobic ammonium oxidation in a sequencing batch reactor to treat urban sewage with a low carbon-to-nitrogen ratio. It reduces the discharge of excess sludge and has the characteristics of energy saving and consumption reduction. Background technique [0002] The general process of biological denitrification is to oxidize ammonia nitrogen to nitrate nitrogen or nitrite nitrogen. The produced nitrate nitrogen can be removed by denitrification, and the produced nitrite nitrogen can be removed by anammox and denitrification process. Whichever method is used requires the participation of heterotrophic denitrifying bacteria, which also highlights a major feature of my country's municipal sewage - a serious shortage of carbon sources. Therefore, in order to solve the above problems, my country's municipal sewage treatment p...

AI Technical Summary

Problems solved by technology

At present, studies have proved that in-situ fermentation of excess sludge in upflow reactors can generate carbon sources to provide electron donors required for denitrification, but the construction of upflow reactors in general sewage plants is costly and difficult, and It is difficult to transform sewage plants. The present invention provides a new solution, that is, to use sequencing batch reactors instead of upflow reactors to achieve high-efficiency, energy-saving denitrification of urban sewage with low carbon-to-nitrogen ratios.

[0003] In addition, the disposal of sludge in my country's sewage treatment is also a big problem. The traditional sludge treatment process includes digestion, dehydration, drying and incineration, etc., and its cost accounts for 40%-50% of the construction and operation costs of the entire sewage plant.

The remaining sludge itself is rich in organic matter and ammonia nitrogen, but at present, domestic sewage plants mostly use separate treatment for sludge and sewage, resulting in a great waste of energy, and improper treatment is likely to pollute the environment

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