Device and method for treating municipal wastewater with low C/N ratio through silicon source adsorption/nitrification/partial denitrification/anaerobic ammonia oxidation coupling process

Abstract

The invention provide a device and method for treating municipal wastewater with a low C / N ratio through a silicon source adsorption / nitrification / partial denitrification / anaerobic ammonia oxidation coupling process, and belongs to the field of wastewater treatment. According to the method, municipal domestic wastewater enters an adsorption tank at first, and most organic substances in the wastewater are adsorbed by activated sludge through mixed aeration; after precipitation, a supernatant enters a nitrification / partial denitrification / anaerobic ammonia oxidation reactor, and part of the sludge enters a fermentation tank; low-oxygen aeration is carried out after the supernatant enters a nitrification / partial denitrification / anaerobic ammonia oxidation reactor, and then short-cut nitrification and anaerobic ammonia oxidation are carried out synchronously; short-cut nitrification is not strictly controlled, so that part of ammonia nitrogen is subjected to complete nitrification; after the reaction is finished, the content of nitrate nitrogen in the nitrification / partial denitrification / anaerobic ammonia oxidation reactor is very high, and meanwhile the fermented supernatant is pumped for anoxic stirring; by use of a silicon source in a fermentation solution, nitrate nitrogen is reduced to nitrite nitrogen for an anaerobic ammonia oxidation reaction with ammonia nitrogen in the fermentation solution, so that total nitrogen in the municipal domestic wastewater can be efficiently removed.

Description

technical field [0001] The invention relates to a carbon source adsorption / nitrification / partial denitrification / ANAMMOX coupling process device and method for treating low C / N urban sewage, which belongs to the technical field of sewage biological treatment. Specifically, urban domestic sewage first enters an adsorption pool, Through aeration and mixing, most of the organic matter in the sewage is absorbed by the activated sludge. After precipitation, the supernatant enters the nitrification / partial denitrification / anammox reactor, and part of the sludge enters the fermentation tank; nitrification / partial denitrification / anaerobic The ammonia oxidation reactor is aerated after entering water to convert ammonia nitrogen into nitrate nitrogen, then pump it into the supernatant of the fermentation tank, stir in the absence of oxygen, use the carbon source in the fermentation liquid to reduce nitrate nitrogen to nitrite nitrogen and mix with the fermentation liquid Anaerobic ammo...

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Problems solved by technology

[0004] In the process of biological denitrification and phosphorus removal, a large amount of residual sludge will be produced, which contains a large amount of organic matter. Direct incineration or landfill treatment will not only have other impacts on the environment but also waste this part of organic resources.

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