利用好氧颗粒污泥实现同时除磷脱氮

Simultaneous Removal of Nitrogen and Phosphorus by Using Aerobic Granular Sludge

为实现同时除磷脱氮,以单级SBR中的好氧颗粒污泥为研究对象,在温度为25℃、pH值为7～8、厌氧反应80～90 min、好氧反应240min、曝气阶段的DO为1～2 mg/L、SRT为20 d的运行条件下进行了研究.结果表明,大量反硝化聚磷菌能够与硝化菌在颗粒污泥中共存并富集,反硝化聚磷菌占全部聚磷菌的73.1%;系统处于稳态时对氮、磷和有机碳具有非常稳定的去除效果.当进水氨氮、磷和乙酸碳浓度分别为25～50、8～15、100～180 mg/L,MLSS为7.0g/L,MLVSS为6.4g/L时,对氨氮、总无机氮、磷、乙酸碳的平均去除率分别为97.8%、89.7%、96.8%和98.8%.

Simultaneous nitrogen and phosphorus removal was achieved by aerobic granular sludge in single sequencing batch reactor (SBR) under the conditions of temperature 25 ℃, pH 7-8, anaerobic reaction time 80-90 min, aerobic reaction 240 min, DO 1-2 mg/L at aeration period, and SRT 20 d. The result shows that a great number of denitrifying phosphorus-accumulation organisms (PAOs) can be enriched in granular sludge in coexistence with nitrifiers, and the denitrifying PAOs accounts for (73.1)% of total PAOs. At steady operation, the system shows stable removal efficiency for nitrogen, phosphorus, and organic carbon. The average removal rate of ammonia nitrogen, total inorganic nitrogen, phosphorus, and acetate-C reaches 97.8%, 89.7%, 96.8%, and 98.8% respectively at the influent concentration of ammonia nitrogen 25-50 mg/L, phosphorus 8-15 mg/L, and acetate-C 100-180 mg/L, as well as MLSS 7.0 g/L and MLVSS 6.4 g/L in the system.