Device and method for strengthening sludge fermentation by FNA and realizing short-distance nitrogen and phosphorus removal of wastewater

Abstract

The invention discloses a device and a method for strengthening sludge fermentation by FNA and realizing short-distance nitrogen and phosphorus removal of wastewater, and belongs to the field of wastewater and sludge treatment. The device comprises a raw water tank, an SBR reactor, an intermediate water tank, a UASB reactor, a sludge treatment reactor, and a sludge fermentation tank. According tothe method, FNA is used for inhibiting nitrite oxidizing bacteria to achieve short-cut nitrification and taken as sludge fermentation pretreatment step to promote the combination of hydrolysis and acidification, a part of sludge discharged by a short-range nitrification reactor is returned after being treated by FNA, and the other part of the sludge enters into the sludge fermentation tank. The SBR reactor firstly performs anoxic denitrification to remove excessive nitrite in the upper cycle, then anaerobic phosphorus release, aerobic phosphorus absorption and partial short-range nitrification, effluent enters UASB together with sludge fermentation broth, a part of ammonia nitrogen and nitrite are subjected to autotrophic nitrogen removal through anaerobic ammonia oxidizing bacteria, and residual nitrite and produced nitrate nitrogen are removed by denitrification of organic matters in the sludge fermentation broth. According to the invention, FNA is used for promoting the developmentof an internal carbon sources and realizing nitrogen and phosphorus removal of municipal wastewater, and the amount of the sludge is reduced, and the energy consumption of wastewater treatment is reduced.

Description

technical field [0001] The invention relates to a device and method for intensifying sludge fermentation with FNA and realizing short-range denitrification and dephosphorization of sewage, belonging to the technical field of sewage biological treatment. This invention innovatively combines free nitrous acid (FNA) to inhibit nitrite oxidizing bacteria to realize short-cut nitrification and promote hydrolysis and acidification as a sludge fermentation pretreatment step, and strengthen sewage while realizing short-cut nitrification biological nitrogen and phosphorus removal. The development of carbon sources in mud provides a new idea for the treatment and disposal of urban domestic sewage sludge. Background technique [0002] At present, most urban sewage treatment plants in my country adopt the traditional nitrification and denitrification biological denitrification process to achieve the standard discharge of nitrogen in sewage. In the traditional biological denitrification...

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Problems solved by technology

However, the above-mentioned technologies have problems such as high energy consumption (high temperature or high pressure), the need for a large amount of chemical substances (chlorine, ozone and alkalinity, etc.) and environmental pollution.

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