FA pretreatment-based enhanced synchronous short-cut denitrification anaerobic ammonia oxidation coupled in-situ fermentation deep denitrification device and method thereof

Abstract

The invention discloses an FA pretreatment-based enhanced synchronous short-cut denitrification anaerobic ammonia oxidation coupled in-situ fermentation deep denitrification device and a method thereof, and belongs to the field of biological sewage treatment. Part of sludge in the short-cut denitrification / anaerobic ammonia oxidation / in-situ fermentation reactor is centrifugally concentrated and then enters a sludge pretreatment reactor, the hydrolysis rate of the sludge is increased after the sludge is treated by free ammonia (FA), and the sludge flows back to the short-cut denitrification / anaerobic ammonia oxidation / in-situ fermentation reactor, so that the in-situ fermentation acid production effect of the sludge is enhanced. The domestic sewage and nitrate wastewater enter a short-cutdenitrification / anaerobic ammonia oxidation / in-situ fermentation reactor in proportion, and nitrate nitrogen is reduced into nitrite nitrogen through a short-cut denitrification reaction by means of easily-degradable organic matter generated in inflow water or under the fermentation action; and ammonia nitrogen and nitrite nitrogen are removed through an anaerobic ammonia oxidation reaction. The sludge discharge is not needed on the whole, and the sludge treatment cost is saved. Economic and efficient denitrification of low-C / N domestic sewage and nitrate wastewater is realized under the condition of not additionally adding a carbon source.

Description

technical field [0001] The invention relates to a device and method for strengthening synchronous short-range denitrification anaerobic ammonium oxidation coupled in-situ fermentation deep denitrification based on FA pretreatment, and belongs to the technical field of sewage biological treatment. Background technique [0002] With the rapid development of today's society and the global attention to environmental issues, the amount of sewage treatment is increasing, and the pollutant discharge standards are becoming increasingly stringent. However, traditional sewage treatment methods are difficult to meet the technical requirements for discharge standards. In addition, the high energy consumption brought about by the sewage treatment process is also one of the issues of concern. [0003] Anaerobic ammonium oxidation, as a new type of high-efficiency and energy-saving biological denitrification technology, can directly convert NH 4 + -N and NO 2 － –N to N 2 , without ext...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that it is difficult for short-range denitrifying microorganisms to directly use complex organic matter in domestic sewage, and high-quality electron donors in domestic sewage are insufficient; and the acid production rate of in-situ fermentation is low, and the hydraulic retention time is long

Images