Improved A2O biochemical reaction system and sewage treatment method

Abstract

The invention relates to the technical field of sewage biochemical treatment, and provides an improved A2O biochemical reaction system and a sewage treatment method.The improved A2O biochemical reaction system comprises at least one anaerobic zone, at least one anoxic zone, at least one aerobic zone and at least one three-phase separator; the three-phase separator is arranged in the aerobic zone and is in sealed connection with the bottom of the aerobic zone, and the three-phase separator is suitable for dividing the aerobic zone into a first aerobic zone and a second aerobic zone. By adopting an integrated pool type structure, the occupied area is saved, the use of a high-efficiency reflux device is facilitated, the reflux energy consumption is reduced, and the nitrogen and phosphorus removal effect of the whole process can be obviously improved. The three-phase separator can automatically fall separated nitrified sludge back to the tail end of the second aerobic zone, the nitrified sludge flows back to the anoxic zone along with nitrified sludge mixed liquor, sludge backflow and internal backflow of the nitrified sludge mixed liquor can be combined into a whole, a set of backflow system is saved, a control point is reduced, operation is simpler, and operation, maintenance and management are convenient.

Description

technical field [0001] The invention relates to the technical field of sewage biochemical treatment, in particular to an improved A2O biochemical reaction system and a sewage treatment method. Background technique [0002] Since the 1970s, the traditional A2O biochemical process has gradually become the mainstream process for biological nitrogen and phosphorus removal, and has made great contributions to environmental protection. The composition of the traditional A2O biochemical process is complex, affected by factors such as sludge age, carbon source, nitrate, etc., resulting in mutual constraints between the denitrification and phosphorus removal functions, the treatment effect is limited to a certain extent, and cannot play the most effective role. Therefore, the optimization and transformation of the traditional A2O biochemical process has been the focus and focus of environmental protection workers' research and discussion for many years. In view of the self-contradic...

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Problems solved by technology

Compared with traditional A2O biochemical processes, these processes are designed to reduce the impact of internal and external reflux carrying nitrate on the anaerobic phosphorus release reaction in the anaerobic zone. Some of these processes also require secondary distribution of influent water, such as A3O process, inverted A2O process, JHB process, etc., which increase the difficulty of process control and management, and will also reduce the utilization ratio of high-quality carbon sources (VFAs) in sewage

In contrast, the traditional UCT process and MUCT process can improve the utilization efficiency of high-quality carbon sources (VFAs) in sewage. However, the traditional UCT process and MUCT process add an internal backflow from the anoxic zone to the anaerobic zone, increasing A control node is installed, which increases the difficulty of operation and management

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