A<2>/O-BAF nitrosation type denitrification phosphorus removal device and process control measure method

Abstract

Belonging to the technical field of sewage nitrogen and phosphorus removal, the invention provides an A<2> / O-BAF nitrosation type denitrification phosphorus removal device and a process control method. The method combines the advantages of short-cut nitrification and denitrification phosphorus removal processes, realizes low matrix whole-course nitrosation by controlling the HRT, aeration quantityand intermittent aeration ratio of BAF under a low C / N condition, provides electron acceptors for the denitrification phosphorus removal process of an A<2> / O anoxic zone, and realizes efficient nitrogen and phosphorus removal of municipal domestic sewage. After a digital signal is transmitted to a real-time control system, the degree of nitrosation is judged according to the set procedure so as to control the aeration quantity and the aerobic / anoxic ratio, thus ensuring the whole-course nitrosation of a BAF reactor; an anaerobic zone 1 is equipped with a TP on-line sensor, an effluent water tank is equipped with a nitrite sensor, the real-time control system adjusts the nitrification liquid reflux ratio (R) according to the monitored TP and nitrite concentration to keep the mass concentration ratio of the anoxic zone nitrite and TP at 1.6-1.8, thus guaranteeing high efficiency denitrification phosphorus and nitrogen removal.

Description

technical field [0001] A 2 The O-BAF nitrosation type denitrification dephosphorization device and process control method belong to the technical field of denitrification and dephosphorization of sewage by activated sludge method combined with biofilm method. Background technique [0002] With the increasingly stringent national drainage requirements and the increasing annual discharge of urban domestic sewage, my country's sewage treatment is facing the dual pressure of improving treatment efficiency and increasing operating costs. The traditional biological nitrogen and phosphorus removal theory believes that C:N:P=200:5:1 is required for the growth of anaerobic microorganisms, and C:N:P=100:5:1 is necessary for the proliferation of aerobic microorganisms. The C / N / P of domestic sewage in the area is about 100:25:3, which is difficult to meet the carbon source required by microorganisms to utilize nitrogen and phosphorus, that is, the characteristics of low C / N and low C / P...

AI Technical Summary

Problems solved by technology

[0003] The traditional activated sludge method is to put nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria in the same reactor. The generation cycle of autotrophic nitrifying bacteria is longer, so a long sludge age and suitable dissolved oxygen are required to ensure good Nitrification effect to achieve NH 4 + -N to NO 2 - -N or NO 3 - -N conversion, but heterotrophic denitrifying bacteria and phosphorus accumulating bacteria use organic substrates to proliferate faster, and require a shorter sludge age to remove phosphorus from sewage, so it is difficult to ensure activity by controlling working conditions Various functional microorganisms in the sludge are in the best growth environment, making it difficult to remove nitrogen and phosphorus simultaneously and efficiently

At the same time, both denitrification and anoxic / aerobic phosphorus uptake processes require sufficient organic matter as electron acceptors to complete biochemical reactions, but the current carbon source in urban domestic sewage is very limited and cannot meet the needs of denitrification and phosphorus uptake at the same time, resulting in The competition of carbon sources makes the efficiency of denitrification and phosphorus removal lower

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