Control method realizing CANON process high-efficiency stable operation

Abstract

The invention relates to a control method realizing CANON process high-efficiency stable operation. The invention belongs to the field of sewage processing. The invention aims at providing a control method realizing CANON process high-efficiency stable operation. The method comprises the steps that: CANON sludge is inoculated into an autotrophic denitration MBR reactor; sewage to be processed is delivered into the autotrophic denitration MBR reactor; and a ratio of aeration amount to influent ammonia load is controlled at 0.25-0.30 (L/min)/(kg/m3/d) through regulating the aeration amount, the influent flow rate and/or hydraulic retention time, such that CANON process high-efficiency stable operation is realized. An ammonia nitrogen removal rate is higher than 90%, a total nitrogen removal rate is higher than 80%, no nitrous accumulates in the reactor, and no excessive nitrate is produced. Under the condition, ammonia oxidation bacteria and anaerobic ammonia oxidation bacteria cooperates. If the aeration amount is too high, anaerobic ammonia oxidation bacteria activity is inhibited, or nitrifying bacteria activity is recovered. If the aeration amount is too low, the aeration amount is too activity is inhibited.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and regeneration, and in particular relates to a control method for efficient and stable operation of a CANON process. Background technique [0002] The whole autotrophic denitrification process (CANON) is a new type of biological denitrification process, which can complete the denitrification in a single reactor. The denitrification process does not need to consume organic carbon sources, which can save 63% compared with the traditional nitrification-denitrification process. Aeration is one of the most economical and effective ways of denitrification. In the CANON process, aerobic ammonium oxidizing bacteria (AOB) first oxidizes a part of ammonia nitrogen to nitrous, and then anaerobic ammonium oxidizing bacteria (anammox) converts nitrous and the remaining ammonia nitrogen into nitrogen emission. Therefore, the efficient and stable operation of the CANON process is based on the synergistic...

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Problems solved by technology

[0003] The main factors affecting the stable operation of the CANON reactor are ammonia nitrogen concentration and dissolved oxygen content (DO). For high-temperature and high-ammonia-nitrogen wastewater, the inhibition of NOB can generally be achieved through a higher concentration of free ammonia, while for low-ammonia nitrogen wastewater. Said, can not achieve higher free ammonia, while lower DO will further limit the nitrogen removal efficiency

Therefore, how to strike a balance between stable operation and high denitrification efficiency, that is, to ensure that there is neither nitrous accumulation nor full-scale nitrification reaction in the CANON reactor under different influent ammonia nitrogen concentrations, and at the same time achieve a higher total nitrogen Removal efficiency is of great significance to the development of this process, and there is no report on this aspect at present

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