Treatment process for realizing urban sewage denitrification and phosphorous removal coupled sludge fermentation by two-stage sequencing batch reactor

Abstract

The invention discloses a treatment process for realizing urban sewage denitrification and phosphorous removal coupled sludge fermentation by a two-stage sequencing batch reactor, and belongs to the field of sewage sludge biological treatment. The process comprises: a water inlet water tank, a bio-reinforced phosphorus removal coupled partial short-range nitrification reactor (EBPR-PN-SBR), an intermediate water tank, an anaerobic ammonium oxidation coupled sludge fermentation and denitrification reactor (ASFD-SBR), and a water outlet water tank. Biological phosphorous removal and short-rangenitrification are carried out in the EBPR-PN-SBR, an internal carbon source stored in the raw water COD is used for phosphorus removal, and phosphorus removal and the conversion of a part of ammonia nitrogen to nitrite nitrogen is carried out in an aerobic section. The anaerobic ammonium oxidation bacteria in ASFD-SBR convert the influent ammonia nitrogen and nitrite nitrogen into nitrogen and a small amount of nitrate nitrogen, the produced nitrate nitrogen is reduced to nitrogen by a carbon source produced by sludge fermentation, the fixed bed filler is used for holding anaerobic ammonium oxidation bacteria, and the denitrification and sludge fermentation process occurs in floc sludge. According to the process, the energy consumption is saved, and denitrification, phosphorus removal andsludge reuse of low-carbon-to-nitrogen ratio (C / N) urban domestic sewage are realized.

Description

technical field [0001] The invention discloses a two-stage sequencing batch reactor to realize the treatment process of urban sewage denitrification and phosphorus removal coupled with sludge fermentation, which is suitable for the current situation of relatively low C / N ratio of urban sewage in my country, and reduces excess sludge while denitrification and phosphorus removal Emissions, with the characteristics of energy saving and consumption reduction. Background technique [0002] Eutrophication of water body is a global environmental problem, which is caused by overgrowth of algae caused by excessive nitrogen and phosphorus content in water body. In order to further reduce the harm caused by nitrogen and phosphorus to the water environment, many countries and regions have enacted new discharge standards for nitrogen, phosphorus and other indicators in sewage. For example, the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) promulgated by...

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.

[0004] 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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