Sewage Simultaneous Nitrification and Denitrification Aeration Control System and Aeration Method

Abstract

The invention proposes a simultaneous nitrification and denitrification aeration control system, using the average value of the COD concentration of the sewage in the pretreatment tank, the average value of the ammonia nitrogen concentration of the sewage, the average value of the nitrate nitrogen concentration of the sewage, and the simultaneous nitrification and denitrification reaction The average value of nitrate nitrogen concentration and ammonia nitrogen concentration of the mixed liquid in the reactor is used to calculate the oxygen demand in the simultaneous nitrification and denitrification reactor, and calculate the air supply and aeration efficiency based on the oxygen demand, and control the fan in combination with the DO concentration Intermittent operation, so as to meet the condition of balanced oxygen supply and oxygen consumption in the simultaneous nitrification and denitrification reactor, and enable the microorganisms in the simultaneous nitrification and denitrification reactor to complete biological denitrification, organic carbon removal and biological phosphorus removal through biochemical processes , to remove the content of target substances in sewage, including COD, NH 4 + ‑N, TN, TP, BOD 5 Wait.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a sewage simultaneous nitrification and denitrification aeration control system and an aeration method. Background technique [0002] Biological treatment process is a widely used sewage treatment technology. Its process is a complex biochemical process. Through the metabolism of microorganisms, pollutants are adsorbed, absorbed, decomposed or converted to achieve sewage purification. The market has introduced and re-developed A / O (anaerobic-aerobic process), A 2 / O (anaerobic-anoxic-aerobic method), oxidation ditch, SBR (sequenced batch activated sludge method), AB (adsorption-biodegradation process), biological contact oxidation, BAF (biological aerated filter) method etc. and various variants of biological treatment processes and reactors. In these different types of processes and reactors, anoxic and aerobic treatment (stage) stages are generally included to realize...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional relatively simple cascade feedback control is widely used for precise control of dissolved oxygen (DO). This control mode lacks feed-forward compensation, and it is difficult to cope with the water load. The large fluctuation of water volume not only has a large hysteresis effect , and the control process is easy to cause system oscillation

Effectiveness of dissolved oxygen and aeration control cannot be guaranteed

However, the AVS precise aeration system, which has been researched and practiced more, is difficult to obtain in real time due to the large amount of data collected by the ASM mathematical model and is too complicated. The actual application is quite difficult, and it is very difficult to implement.

The establishment of an accurate model is also empirical, conditional, and simplified, so the AVS control method based on the theoretical model cannot well meet the needs of DO regulation.

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