一体式MFC-好氧MBR运行效果及膜污染特性

膜生物反应器(MBR)是一种高效的污水处理工艺,而微生物燃料电池(MFC)能利用NO-3作为电子受体进行脱氮。为解决膜生物反应器(MBR)脱氮效率低和膜污染问题,建立了一套能够进行脱氮、有效抑制膜污染的一体式MFC-好氧MBR新工艺。以开路MFC-MBR反应器为对照,对耦合系统中污水处理效果、膜污染情况进行研究。研究表明,2套系统的COD去除率均超过88%,对NH4-N的去除均达到99%。闭路MFC-MBR系统TN去除率达到69.4%,高于开路系统的55.3%。混合液的MLVSS/MLSS稳定在88%左右,同时耦合系统能够改善污泥混合液的性质,zeta电位的绝对值和粘度较开路系统有所减少,污泥颗粒平均体积粒径(233.482μm)较开路系统(94.877μm)有明显增加,膜清洗周期延长了41.17%。

Performance and membrane fouling characteristics in a membrane bioreactor coupled with microbial fuel cell system

Membrane bioreactor (MBR) is an effective process for wastewater treatment,and the microbial fuel cell (MFC) can use nitrate as electron acceptor to remove nitrogen.In this study,a MBR coupled with MFC(MFC-MBR) was established to simultaneously remove nitrogen and mitigate membrane fouling.The performances of wastewater treatment systems,the membrane fouling and the characteristics of mixedliquor were investigated in both the control-MBR,and MFC-MBR.The results showed that the two systems had the similar removal efficiencies of COD (88%) and NH₄-N (99%).The total nitrogen removal efficiency in the MFC-MBR(69.4%) was higher in comparison with that in the control-MBR (55.3%).The ratios of mixed liquor volatile suspended solids (MLVSS) to mixed liquor suspended solids (MLSS) for the two systems were almost identical,and both maintained at 88%.The MFC-MBR system could modify thecharacteristic of mixed liquor,leading to a lower viscosity,higher zeta potential and larger size of microbial flocs.Moreover,the chemical cleaning cycle period was prolonged by 41.17%.