Deep denitrification system device and denitrification process for high-ammonia-nitrogen wastewater

Abstract

The invention discloses a deep denitrification system device for high-ammonia-nitrogen wastewater. The system device comprises a nitration reactor, a denitrification anaerobic reactor and a denitrification biofilter, a water inlet of the nitration reactor is connected with a water inlet pump, a water outlet of the nitration reactor is connected with a water outlet pump, the water outlet pump is communicated with the denitrification anaerobic reactor, a square anaerobic ammonium oxidation bacterium embedding body suspended filler is added into the denitrification anaerobic reactor, a circulating water inlet area, a biological reaction area and a water outlet area are arranged in the denitrification biological filter, the circulating water inlet area is communicated with the biological reaction area, and a pipeline with a circulating pump is arranged at the bottom of the circulating water inlet area and is communicated with a water inlet of the denitrification anaerobic reactor. The system device and a process thereof have the effects of high adaptability, no need of precise aeration, resistance to organic load impact, low dissolved oxygen influence, high denitrification efficiency and the like when being used for treating high-ammonia-nitrogen wastewater, and the total nitrogen of effluent meets the emission standard.

Description

technical field [0001] The invention relates to the technical field of denitrification by sewage biological treatment, in particular to a deep denitrification system device and a denitrification process for high-ammonia-nitrogen wastewater. Background technique [0002] High-concentration ammonia nitrogen wastewater mainly comes from landfill leachate, sludge fermentation liquid, monosodium glutamate production, chemical fertilizer production, livestock and poultry breeding and other industries. Excessive discharge of nitrogen in this type of wastewater is one of the main causes of water eutrophication and environmental pollution. The current denitrification technologies for sewage mainly include physical methods, chemical methods and biological methods. Relatively speaking, the biological denitrification technology is the most economical and efficient and has been widely used. However, for high-concentration ammonia-nitrogen wastewater, it is restricted because of its high...

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Problems solved by technology

However, these combined processes often have the following problems: (1) The short-cut nitrification process section requires strict DO control and precise aeration, and is affected by the organic carbon source in the incoming water. Excessive aeration or insufficient carbon source will directly lead to short-cut nitrification. (2) Anammox bacteria are greatly affected by the inhibition of dissolved oxygen and organic carbon sources in incoming water, and their adaptability is weak. At the same time, the unbalanced ratio of nitrite nitrogen and ammonia nitrogen in incoming water will also lead to poor denitrification. Ideal; (3) The pure anaerobic ammonium oxidation denitrification of influent water that meets the ratio of nitrate nitrogen and ammonia nitrogen is not complete, and the effluent still contains about 11% nitrate nitrogen, which is also one of the reasons for the total nitrogen in the effluent not reaching the standard

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