A forward osmosis membrane system for the post-treatment of MBR-treated landfill leachate
A forward osmosis membrane system for the post-treatment of MBR-treated landfill leachate
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用于MBR处理的垃圾渗滤液后处理的正向渗透膜系统
DOI：
10.1016/j.memsci.2014.08.023
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发表时间：
2014-12-01
影响因子：
9.5
通讯作者：
Wu, Zhichao
中科院分区：
文献类型：
--
作者：
Dong, Ying;Wang, Zhiwei;Wu, Zhichao
以垃圾渗滤液（[FL]）为进水，采用正渗透（F0）膜系统对膜生物反应器（MBR）出水进行后处理，研究了膜的过滤特性、膜污染及清洗。在短期测试中，观察到对于[FL]处理，膜活性层面向汲取溶液（AL-DS模式）的水通量低于膜活性层面向进料溶液（AL-FS模式）的水通量。数学模型能较好地模拟AL-FS模式下的通量变化，而AL-DS模式下的通量变化偏离模型曲线，说明AL-DS模式下的膜污染在1 h内迅速发展。在长期的过滤过程中，约98.6%的COD，96.6%的TR和76.9%的铵被FO系统截留。随着操作时间的增加，也观察到水通量的降低。共聚焦激光扫描显微镜和傅里叶变换红外光谱证实了污染层中多糖和蛋白质的存在。无机污染物主要由Ca、Na、Mg、K、Si、Fe和Al组成，在长期运行过程中，滤饼的浓差极化效应也起着重要作用。水力清洗后膜通量恢复了88.9%，而化学清洗后膜通量恢复到初始通量的98.9%，表明在长期运行中，需要进行化学清洗以消除不可逆污染，恢复膜的渗透性。(C)2014 Elsevier BY. All rights reserved.
Filtration behaviors, membrane fouling and cleaning were investigated in a forward osmosis (F0) membrane system used to post-treat the effluent of a membrane bioreactor (MBR) fed with landfill leachate ([FL). In short-term tests, it was observed that the water flux with the membrane active layer facing the draw solution (AL-DS mode) was lower than that with the membrane active layer facing the feed solution (AL-FS mode) for [FL treatment. Mathematical models could well simulate the flux evolution of AL-FS mode while the flux of AL-DS deviated from the modeling curve, suggesting that fouling could be rapidly developed within 1 h filtration for AL-DS mode. During long-term filtration, about 98.6% of COD, 96.6% of TR and 76.9% of ammonium were rejected by the FO system. A decrease of water flux was also observed with an increase in operation time. Confocal laser scanning microscopy and Fourier transform infrared spectroscopy confirmed the existence of polysaccharides and proteins in the fouling layer. Inorganic fouling was mainly caused by Ca, Na, Mg, K, Si, Fe and Al. It was also found that the effect of cake enhanced concentration polarization played an important role during long-term operation. About 88.9% of the permeate flux was recovered after hydraulic cleaning while it reached 98.9% of the initial flux after chemical cleaning, indicating that chemical cleaning was needed to eliminate irreversible fouling and to recover membrane permeability during long-term operation. (C) 2014 Elsevier BY. All rights reserved.