Understanding the size and character of fouling-causing substances from effluent organic matter (EfOM) in low-pressure membrane filtration
Understanding the size and character of fouling-causing substances from effluent organic matter (EfOM) in low-pressure membrane filtration
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DOI：
10.1021/es060070r
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发表时间：
2006-07-15
影响因子：
11.4
通讯作者：
Jekel, Martin
中科院分区：
文献类型：
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作者：
Laabs, Claudia N.;Amy, Gary L.;Jekel, Martin
微滤(MF)和超滤(UF)膜的搅拌槽试验表明，污水处理厂出水的通量下降很大。例如，对于中孔膜，通量在15min内下降到初始通量的70%-80%(J(0)在1000 L/m(2)h到1500 L/m(2)h的范围内)。这一时间相当于累计滤量为110 L/米(2)。搅拌槽试验的进料和渗透样品用体积排阻色谱(SEC)在线检测有机碳和UVA(254)进行分析。由此得到的色谱图在所谓的多糖(PS)峰上显示出进料样品和渗透样品之间的明显差异。PS峰中的洗脱物质(有机胶体、多糖和蛋白质)完全被超滤膜保留，部分被微滤膜保留，并对观察到的污染负责。通过连续过滤实验，确定了这些大分子的尺寸在10-100 nm之间。
Stirred cell tests with microfiltration (MF) and ultrafiltration (UF) membranes show high flux decline for WWTP effluents. For the MF membrane, for example, the flux declines within 15 min to 70-80% of the initial flux (J(0) is in the range of 1000 L/m(2)h to 1500 L/m(2)h). This time corresponds to the filtration of a cumulative volume of 110 L/m(2). Feed and permeate samples of the stirred cell tests are analyzed by size-exclusion chromatography (SEC) with on-line organic carbon and UVA(254) detection. The resulting chromatograms exhibit a clear difference between the feed and permeate samples in the so-called polysaccharide (PS) peak. The substances eluting in the PS peak (organic colloids, polysaccharides, and proteins) are retained completely by UF membranes and partly by MF membranes, and are responsible for the observed fouling. By sequential filtration experiments the sizes of these macromolecules are determined to be in the range of 10 to 100 nm.