间歇曝气MBR处理低碳高氮磷城市生活污水研究

采用间歇曝气膜生物反应器对低碳高氮磷型城市生活污水进行了处理研究.结果表明,在水力停留时间12h、曝气/停曝周期30min/60min和不排泥的运行条件下,可去除90%以上的COD、接近100%的氨氮和80%以上的总氮,但系统对磷基本无去除能力.系统内硝化作用完成得快速且充分,而反硝化作用则是总氮去除的限制性步骤.试验还发现,膜污染速率与反应器内污泥浓度呈正线性关系,污泥浓度越高,膜污染速率越大.

Treatment of Municipal Wastewater with Low C/N Ratio Using an Intermittently Aerated Membrane Bioreactor

A laboratory-scale intermittently aerated membrane bioreactor was applied to treat synthetic household wastewater characterized with low organic matter and high nitrogen concentration. Experimental results showed that at the condition of HRT at 12 h, aeration/non-aeration cycle at 30min/60min and a very long SRT, more than 90% of COD and close 100% ammonia nitrogen could be removed, and the average removal efficiency of TN was more than 80%, but this treatment process seemed to be not available in phosphorus removal. Nitrification was accomplished quickly and completely in the system. The denitrification appeared to be the rate-limiting step for TN removal in the system. Furthermore, a positive linear correlation between the fouling rate and the MLSS concentration was founded, and the higher the MLSS concentration was, the higher fouling rate was.