Dual sludge reflux AOA advanced nitrogen removal method for enhancing endogenous denitrification through sludge fermentation

Abstract

The invention provides a dual sludge reflux AOA advanced nitrogen removal method for enhancing endogenous denitrification through sludge fermentation and belongs to the field of sewage treatment and recycling. An internal carbon source is accumulated in an anaerobic stage in an AOA reactor, then nitration reaction is executed in an aerobic zone, the internal carbon source accumulated in the anaerobic stage and a carbon source produced through sludge fermentation in an anoxic zone and a secondary sedimentation tank are utilized in an anoxic stage to achieve denitrified advanced nitrogen removal. A nitrification starting stage is an active nitrification enhancing stage, and the higher ammonium-nitrogen removal rate is finally achieved by increasing inflow water ammonium and nitrogen and increasing the volume of the aerobic zone. At the nitrification starting stage, part of aerobic zone is converted into the anoxic zone, the aerobiotic and anoxic proportion of the reactor is increased, the endogenous denitrification and sludge fermentation effects are improved, and the total nitrogen removal rate is improved. At a stable operation stage, inflow water ammonium and nitrogen are increased, the inflow water ammonium-nitrogen ratio is reduced, and the reactor still maintains higher total nitrogen removal rate. An additional carbon source is not needed, and the aerobic zone is small involume during stable operation.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and regeneration, and in particular relates to a method and a device for double sludge reflux AOA deep denitrification through sludge fermentation and enhanced endogenous denitrification. Background technique [0002] With the rapid development of human economy, environmental pollution is becoming more and more serious. Among them, water pollution is becoming more and more serious, especially the eutrophication of water caused by nitrogen and phosphorus, which has seriously affected people's lives. At present, the treatment technology of nitrogen and phosphorus in sewage treatment plants in my country mostly adopts continuous nitrification and denitrification denitrification process. [0003] The continuous flow AOA process is currently the most widely used process in my country. Most of them are pre-denitrification processes, which need to be equipped with a digestive liquid reflux device,...

AI Technical Summary

Problems solved by technology

Most of them are pre-denitrification processes, which require a digestive liquid reflux device, and the denitrification effect is limited by the reflux ratio, making it difficult to denitrify deeply

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