两级序批式膜生物反应器处理生活污水的研究

Two-stage Sequencing Batch Membrane Bioreactor for Treatment of Domestic Sewage

提出两级序批式膜生物反应器(SBMBR)工艺,并将其用于处理生活污水,通过运行条件的控制,将聚磷菌与硝化菌分别控制在两级反应器中优势生长,形成先除磷、后脱氮的运行模式,解决目前生物脱氮除磷工艺中出现的脱氮与除磷矛盾的问题,同时进一步去除难降解有机物;通过序批式曝气、空曝、间歇抽滤出水相结合的运行方式,有效控制了膜污染,提高了系统运行的稳定性。在稳定运行阶段,平均出水COD、TN、TP、NH4+-N分别为24.75、12.33、0.45、2.71mg/L,满足《城市污水再生利用景观环境用水水质》(GB/T18921—2002)的要求;与传统MBR相比,SBM-BR可以在更高的膜通量下运行,有效减缓浓差极化现象,保持更低的膜污染速率。

Two-stage sequencing batch membrane bioreaetor （TSBMBR） process was put forward and used to treat domestic sewage. Operation parameters are controlled to keep the predominance of phosphorus accumulating organisms （PAOs） and nitrification bacteria in the two-stage reactor. In this operation process, phosphorus first and then nitrogen are removed, aiming to resolve the conflict between phosphorus and nitrogen removal in the biological treatment process. Meanwhile, refractory organics can be further removed. Through sequencing aeration, idle period and intermittent filtration operation mode, membrane fouling can be effectively mitigated, and system operation stability can also be improved. During the stable operation period, the average concentrations of COD, TN, TP and NH4^＋ - N in the effluent are 24.75, 12.33, 0.45 and 2.71 mg/L respectively, meeting the requirement in Reuse of Urban Recycling Water- Water Quality Standard for Scenic Environment Use （GB/T 18921 -2002 ）. Compared with traditional MBR, TSBMBR can provide higher trans-membrane flux, effectively mitigate polarization and keep lower membrane fouling rate.