聚偏氟乙烯和聚醚砜平板膜在浸没式膜生物反应器中处理生活污水的对比研究。

Comparative study of polyvinylidene fluoride and PES flat membranes in submerged MBRs to treat domestic wastewater.

作者信息

Zhu T, Xie Y H, Jiang J, Wang Y T, Zhang H J, Nozaki T

机构信息

School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China.

出版信息

Water Sci Technol. 2009;59(3):399-405. doi: 10.2166/wst.2009.849.

DOI:10.2166/wst.2009.849

PMID:19213993

Abstract

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 mICROm and the same anoxic/ oxic (A/O) process. The experimental results showed that: (1) With the influent of BOD(5) 200-500 mg/L and COD(Cr) 400-1,000 mg/L, PVDF MBR achieved the removal efficiencies of BOD(5) 96-98% and COD(Cr) 89-98%, and those were 97-99% and 93-97% in PES MBR. The interceptive efficiency of PES membrane to BOD(5) and COD(Cr) was superior to PVDF membrane. (2) The removal efficiencies of TN and NH(3)-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.

摘要

本研究采用聚偏氟乙烯（PVDF）和聚醚砜（PES）两种膜，应用于浸没式平板膜生物反应器（MBR）中处理生活污水。MBR在相同的反应器结构、相同的0.45μm膜孔径以及相同的缺氧/好氧（A/O）工艺条件下运行。实验结果表明：（1）在进水生化需氧量（BOD₅）为200 - 500mg/L、化学需氧量（COD₍Cr₎）为400 - 1000mg/L时，PVDF膜生物反应器对BOD₅的去除效率为96 - 98%，对COD₍Cr₎的去除效率为89 - 98%；而PES膜生物反应器对BOD₅和COD₍Cr₎的去除效率分别为97 - 99%和93 - 97%。PES膜对BOD₅和COD₍Cr₎的截留效率优于PVDF膜。（2）两个MBR中总氮（TN）和氨氮（NH₃ - N）的去除效率均表现良好，均大于85%。两个MBR中总磷（TP）的去除效率均大于80%。（3）实验期间混合液悬浮固体（MLSS）浓度从2000mg/L变化到7000mg/L。PES膜未进行清洗且膜通量稳定。然而，PVDF膜的通量迅速下降并进行了两次清洗。这意味着PES膜比PVDF膜具有更好的性能。