Recovery and its mechanism of nitrogen removal efficiency of nitrification-denitrification under low temperature by artificially synthesized zeolite.
Water shortage and water pollution are serious challenges facing our country. Municipal sewage can become an important reclaimed water resource after treatment, but the efficiency of traditional biological nitrogen removal process is significantly reduced under low temperature conditions, which has become the core bottleneck restricting the stable operation of sewage treatment plants (WWTPs) in northern China. At present, it is often alleviated by process adjustment or the addition of low-temperature strains, but the long-term effectiveness and practical application of these methods are still relatively limited. In order to solve the above problems, this study constructed a new low-temperature nitrification denitrification system based on synthetic zeolite, systematically evaluated the nitrogen removal efficiency of the system under low temperature conditions, clarified the mechanism of synthetic zeolite on nitrogen removal performance and microbial activity recovery, and further analyzed its engineering application potential, aiming to provide theoretical basis and technical support for the development of high-efficiency and low-consumption low-temperature sewage denitrification technology.