Effect of membrane property and feed water organic matter quality on long-term performance of the gravity-driven membrane filtration process
Effect of membrane property and feed water organic matter quality on long-term performance of the gravity-driven membrane filtration process
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DOI：
10.1007/s11356-017-9627-8
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发表时间：
2019-01-01
影响因子：
5.8
通讯作者：
Lee, Yunho
中科院分区：
文献类型：
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作者：
Lee, Dongwhi;Lee, Yuri;Lee, Yunho
研究了重力驱动膜（GDM）过滤过程中膜性能和进水有机物质量对渗透通量和水质的影响。GDM过滤在65 mbar的静水压下以死端模式连续进行超过500天，没有任何反冲洗或膜清洁。采用3种超滤膜（PES-100 kDa、PVDF-120 kDa和PVDF-100 kDa）和1种微滤膜（PTFE-0.3m）对不同有机质含量的湖水进行了处理试验。在GDM过滤后一周内，4种膜的通量迅速下降到8L/（m2 × h）。在整个GDM过滤过程中，四种膜的通量变化非常相似，表明膜性能对通量的影响很小。通量强烈地依赖于给水有机物的质量。处理低有机物含量的水（7- 60天），平均通量为5L/（m（2）× h），处理高有机物含量的水（60- 300天），平均通量下降到2L/（m（2）× h）。藻源性生物聚合物的积累是主要负责通过形成高渗透阻力的生物膜通量下降。当进水中含有较低水平的生物聚合物和较高水平的易生物降解有机物时，300- 500天的平均通量增加到3.5L/（m（2）xh），这产生了具有较低渗透阻力的开放和非均质生物膜。对于四种膜，大肠杆菌的去除效率大于5 log，而总细菌细胞的去除效率为1 log-2 log，表明过滤后一些细菌再生长。MS 2噬菌体的去除效率为2.4 log，污染的PES-UF和PTFE-MF膜的去除效率为1.5 log。
This study investigated the influence of membrane property and feed water organic matter quality on the permeate flux and water quality during gravity-driven membrane (GDM) filtration. GDM filtration was continuously carried out over 500days at hydrostatic pressure of 65mbar in dead-end mode without any back-flushing or membrane cleaning. Three ultrafiltration (UF) membranes (PES-100kDa, PVDF-120kDa, and PVDF-100kDa) and one microfiltration (MF) membrane (PTFE-0.3m) were tested for treating lake water with varied organic matter qualities due to algal growth. The fluxes of the four membranes rapidly decreased to 8L/(m(2)xh) within a week of GDM filtration. The flux variations were quite similar for the four membranes during the entire GDM filtration, indicating that membrane property has a little effect on the flux. The flux strongly depends on the feed water organic matter quality. The average flux in treating low organics containing water (7-60days) was 5L/(m(2)xh) and decreased to 2L/(m(2)xh) in treating high organics containing water (60-300days). The accumulation of algal-derived biopolymers was mainly responsible for the flux decline by forming biofilms with high permeation resistance. The average flux in 300-500days increased to 3.5L/(m(2)xh) when the feed water contained lower levels of biopolymers and higher levels of easily biodegradable organics, which created open and heterogeneous biofilms with lower permeation resistance. Removal efficiency for Escherichia coli was more than 5 log, while the removal efficiency for total bacterial cells was 1 log-2 log for the four membranes, indicating some bacterial regrowth after the filtration. Removal efficiency for the MS2 phage was 2.4 log and 1.5 log for the fouled PES-UF and PTFE-MF membranes.