Two kinds of membranes, polyvinylidene fluoride (PVDF) and polyethersulfone (PES), were used in submerged flat membrane bioreactors (MBRs) to treat domestic wastewater in this study. The MBRs ran under the same reactor structure, the same membrane pore size of 0.45 μm and the same anoxic/ oxic (A/O) process. The experimental results showed that: (1) With the influent of BOD5 200–500 mg/L and CODCr 400–1,000 mg/L, PVDF MBR achieved the removal efficiencies of BOD5 96–98% and CODCr 89–98%, and those were 97–99% and 93–97% in PES MBR. The interceptive efficiency of PES membrane to BOD5 and CODCr was superior to PVDF membrane. (2) The removal efficiencies of TN and NH3‐N in two MBRs exhibited good results which were greater than 85%. The removal efficiencies of TP were greater than 80% in both MBRs. (3) MLSS concentration changed from 2,000 mg/L to 7,000 mg/L during the experiment. PES membrane was not washed and the membrane flux was steady. However, the flux of PVDF one decreased quickly and was washed for twice. It meant that PES membrane had fine capability than PVDF one.
Comparative study of polyvinylidene fluoride and PES flat membranes in submerged MBRs to treat domestic wastewater
T. Zhu, Y. H. Xie, J. Jiang, Y. T. Wang, H. J. Zhang, T. Nozaki; Comparative study of polyvinylidene fluoride and PES flat membranes in submerged MBRs to treat domestic wastewater. Water Sci Technol 1 February 2009; 59 (3): 399–405. doi: https://doi.org/10.2166/wst.2009.849
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