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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Effect of seasonal succession of algal communities on fouling of MF membrane
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Effect of seasonal succession of algal communities on fouling of MF membrane

机译：藻类群落季节连续对MF膜污染的影响

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摘要

An emerging threat to membrane application is the seasonal proliferation of algae in water sources such as rivers, reservoirs and lakes. This study investigated the link between feed parameters and the membrane performance of a pilot-scale microfiltration (MF) plant for 7 months. The seasonal succession of algae in relation to temperature dynamics was monitored. Temperature-dependent seasonal patterns for algae species were observed. The water temperatures during the dominance of cyanobacteria, especially Microcystis, were relatively higher (over 25 degrees C) than those during the dominance of diatoms. Diatoms did not much affect membrane performance (less than 0.2 kgf/cm(2)), however, under the cyanobacterial dominance condition, especially Microcystis sp., transmembrane pressure (TMP) reached up to the limited level (0.4 kgf/cm(2)) within one month. Concurrently UV absorbance at 254 nm wavelength and dissolved organic carbon values increased significantly during the Microcystis bloom and the build-up rate of TMP increased up to 0.005 kgf/cm(2)/day. Membrane autopsy also showed that during the dominance of diatom, application of cleaning agents can fully remove foulants on the membrane surface. However, during the dominance of cyanobacteria, there is a lot of Al, Si and organic complex on the fouled membrane, indicating the formation of Al-organic complexes that contributed to the residual membrane fouling. It is suggested that the irrecoverable fouling layer still contained some Al, mostly in complex with organics. Thus, organic matter originated from cyanobacteria may cause a serious impact on membrane fouling by forming the complex with metal ions originated from coagulant.
机译：对膜应用的新兴威胁是水源中藻类的季节性增殖，如河流，水库和湖泊。本研究研究了饲料参数与试验尺度微滤（MF）植物的膜性能之间的链接7个月。监测了与温度动态相关的藻类季节性连续。观察到藻类物种的温度依赖季节性模式。在硅藻的统治性，尤其是微囊杆菌的优势期间的水温比硅藻的优势相对较高（超过25℃）。硅藻没有影响膜性能（小于0.2kgf / cm（2）），然而，在蓝细菌优势条件下，尤其是微阴压Sp。，跨膜压力（TMP）达到限量（0.4kgf / cm（2 ））在一个月内。在微囊囊叶片中同时在254nm波长和溶解的有机碳值下的紫外光吸光度显着增加，TMP的累积率增加至0.005kgf / cm（2）/天。膜尸检还表明，在硅藻的优势期间，清洁剂的应用可以完全去除膜表面上的污垢。然而，在枯枝杆菌的优势期间，污垢膜上有很多Al，Si和有机络合物，表明形成了对残留膜污垢有贡献的al-有机络合物。建议，不可恢复的污垢层仍然含有一些Al，主要是与有机体复杂的。因此，来自青霉菌的有机物可能通过形成源自凝结剂的金属离子来引起膜污染的严重影响。

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