Autotrophic denitrification synchronous sludge fermentation coupled denitrification device and method for sewage with low nitrogen ratio

Abstract

The invention relates to an autotrophic denitrification synchronous sludge fermentation coupled denitrification device and method for sewage with low nitrogen ratio. A raw water tank, a sludge storage pool and a sedimentation pool are connected with an autotrophic denitrification synchronous sludge fermentation coupled denitrification reactor; the autotrophic denitrification synchronous sludge fermentation coupled denitrification reactor is provided with a self-circulation pipeline. The method comprises the following steps: enabling raw material, shortcut nitrification reflux liquid and fresh remaining sludge to enter the autotrophic denitrification synchronous sludge fermentation coupled denitrification reactor together, enabling part of ammonia nitrogen and nitrite to perform autotrophic denitrification through anaerobic ammonium oxidation bacteria, enabling the remaining nitrite and nitrate nitrogen to utilize organic matters in the raw water and a carbon source produced by fermentation of the remaining sludge to perform denitrification, nitrifying outlet water in a shortcut nitrification reactor, performing sludge-water separation by the sedimentation pool, and then enabling part of nitrification liquid to reflux into the autotrophic denitrification synchronous sludge fermentation coupled denitrification reactor. According to the device and the method, provided by the invention, the high ammonia nitrogen load impact can be effectively resisted, the raw water and the carbon source produced by fermentation are fully utilized, the denitrification efficiency of waste water is improved, and the production of sludge can be simultaneously reduced.

Description

technical field [0001] The invention relates to the technical field of biochemical treatment of high ammonia nitrogen wastewater and excess sludge. The ammonia nitrogen released by sludge fermentation and the nitrous oxide produced by short-range nitrification are removed through anaerobic ammonium oxidation, and the denitrifying bacteria use the volatile organic acid produced by hydrolysis and acidification as electrons. The donor denitrifies the generated nitrate nitrogen to achieve the deep removal of total nitrogen and the effective utilization of sludge. Background technique [0002] Sewage with low carbon-to-nitrogen ratio, such as sewage treatment plant sludge nitrification liquid, landfill leachate, etc., this kind of wastewater has a serious shortage of carbon sources, and its own carbon source cannot meet the needs of denitrification at all, so it becomes the total nitrogen of sewage biological treatment. Key reasons for non-compliance. To solve this problem, impr...

AI Technical Summary

Problems solved by technology

However, due to the anammox reaction relationship, there is still a lack of effective control on how to ensure a stable and continuous ratio of ammonia nitrogen to nitrite nitrogen, and part of the nitrate nitrogen will be produced during the reaction

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