BAF-MBR用于污水深度处理与同步化学除磷

Advanced wastewater treatment with simultaneous removal of phosphorus in combined BAF-MBR processes

以南方城镇生活污水为研究对象,对BAF-MBR组合系统进行研究。BAF-MBR组合系统运行稳定,去污完全,出水COD、NH+4-N、TN、TP的浓度分别达到7.11、0.16、8.85和0.34 mg·L-1,均达到了污水回用的最高要求。在后置MBR池内进行同步化学除磷时,Fe SO4·7H2O的投加量为20 mg·L-1时,出水TP达到0.34 mg·L-1,一定程度上加剧了膜污染;Al2(SO4)3·18H2O的投加量为30 mg·L-1,出水TP达到0.33 mg·L-1,能有效减缓膜污染进程。

The performance of combined BAF-MBR processes in treating the municipal wastewater of a town in southern China was investigated. The experimental results demonstrated that the processes were able to remove most pollutants from the wastewater. The average concentrations of COD, NH4 -N, TN, and TP in the fi- nal effluent were 7. 11, 0. 16, 8.85, and 0.34 mg · L-1, respectively, meeting the requirements for effluent re- use. When simultaneous chemical removal of phosphorus for the BAF effluent was performed in the subsequent MBR, with a FeSO4 ~ 7H2O dosage of 20 mg ·L-1, the effluent TP concentration was 0.34 mg · L-1, while the membrane fouling was aggravated to some extent. However, when 30 mg · L-1 of A12 （SO4） 3 · 18H2O was used instead of FeSO4 · 7H2O4 the effluent TP concentration was 0.33 mg· L-1, and membrane fouling could be effectively alleviated.