Process for treating high-concentration nitrate and ammonia-nitrogen wastewater by using sludge fermentation liquor as carbon source through series connection of short-cut denitrification and anaerobic ammonia oxidation

Abstract

The invention discloses a process for treating high-concentration nitrate and ammonia-nitrogen wastewater by using sludge fermentation liquor as a carbon source through series connection of short-cut denitrification and anaerobic ammonia oxidation, and belongs to the field of sewage treatment. The device comprises a sludge fermentation tank, a PD-SBR reactor, an AMX-SBR reactor and the like. The method comprises the following steps: the residual sludge is fermented under a medium-temperature alkaline anaerobic condition, and converting refractory organic matters into easily degradable organic matters; denitrifying bacteria perform short-cut denitrification by utilizing volatile fatty acid in the fermentation liquor, and nitrate is converted into nitrite; and effluent and high-ammonia-nitrogen wastewater enter an anaerobic ammonium oxidation film reactor together for autotrophic nitrogen removal, and the polyurethane sponge filler is used for holding anaerobic ammonium oxidation bacteria. According to the method, the aeration energy consumption is reduced, the sludge fermentation liquid is used as the external carbon source, a high-quality carbon source is provided for denitrification, sludge reduction is realized, the sludge treatment cost and the external carbon source addition cost are reduced, stable nitrite accumulation is realized by short-cut denitrification, and synchronous treatment of high-nitrate wastewater and high-ammonia-nitrogen wastewater is realized by combining anaerobic ammonia oxidation.

Description

technical field [0001] The invention relates to a process for treating high-concentration nitrate and ammonia nitrogen wastewater by using sludge fermentation liquid as a carbon source to realize short-range denitrification in series with anaerobic ammonium oxidation, and belongs to the field of sewage treatment and sludge biochemical treatment. Background technique [0002] The amount of urban sewage treatment in my country continues to increase, and a large amount of excess sludge will inevitably be produced. Its treatment and disposal is also a major problem. If it is not handled properly, it will cause secondary pollution. Anaerobic fermentation of sludge can produce a large amount of volatile fatty acids, including acetic acid and propionic acid, which are high-quality carbon sources that are easily utilized by denitrifying bacteria. Using sludge fermentation liquid as an external carbon source can not only achieve sludge reduction, but also save the addition of externa...

AI Technical Summary

Problems solved by technology

The traditional biological denitrification method needs to add a large amount of organic carbon sources to treat nitrate wastewater, which not only consumes organic carbon sources, but also produces a large amount of excess sludge, which increases the cost and energy consumption of sludge treatment and disposal.

Many wastewaters with high ammonia nitrogen concentration (ammonia nitrogen concentration is 200-400mg / L) in China also have the problem of insufficient carbon sources, so they cannot meet the needs of denitrification

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