部分亚硝化-厌氧氨氧化处理磁混凝生活污水

Partial nitritation-Anammox process treating magnetic coagulation domestic sewage.

以磁混凝预处理后的生活污水为处理对象,构建了部分亚硝化-厌氧氨氧化分体式反应器,通过曝气调控与生物强化促进部分亚硝化反应的稳定进行,并耦合厌氧氨氧化反应进行深度脱氮.近100d的运行结果表明,在生物强化和间歇曝气的控制条件下,亚硝酸盐积累率达到了89.93%;提高亚硝化反应器中曝气阶段溶解氧浓度(从0.6~0.8mg/L升高至1.0~1.2mg/L)有利于氨氮与总氮去除.该系统最高能够去除95.45%的氨氮和86.28%的总氮,实现了稳定、高效脱氮;磁混凝预处理后的生活污水在亚硝化反应器中,间歇曝气条件促进了残留的溶解性有机物为反硝化提供碳源,COD总去除率达到64.65%~74.42%,并且亚硝化反应器出水与系统最终出水的有机物组分相似,主要为难降解有机物.

Two-stage partial nitrification and anammox process was used to treat magnetic coagulation domestic sewage.Through regulating aeration and bioaugmentation,partial nitritation of magnetic coagulation sewage was achieved,and advanced nitrogen removal was proceeded by coupling anammox reaction.The 100days’operational results showed that controlling intermittent aeration and bioaugmentation,nitrite accumulation rate reached 89.93%.Further increasing in DO from 0.6~0.8 to 1.0~1.2mg/L was beneficial to enhance ammonia and TN removal efficiencies.The system removed up to 95.45%of ammonia nitrogen and 86.28%of total nitrogen,and achieved stable and efficient nitrogen removal.During the treatment of magnetic coagulation pretreated sewage in the partial-nitritation reactor,the residual dissolved organic matter was used to provide carbon source for denitrification under intermittent aeration.COD removal efficiencies of the combined process achieved 64.65%~74.42%.The organic components in the effluent of partial-nitritation reactor and the final effluent of the system were similar,mainly refractory organics.