Fouling indices for low pressure hollow fiber membrane performance assessment.
Fouling indices for low pressure hollow fiber membrane performance assessment.
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DOI：
10.1016/j.watres.2011.02.020
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发表时间：
2011-04
期刊：
影响因子：
12.8
通讯作者：
A. Nguyen;J. Tobiason;Kerry J. Howe
中科院分区：
文献类型：
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作者：
A. Nguyen;J. Tobiason;Kerry J. Howe
本研究评估了使用污染指数来描述低压膜污染的情况。这项研究的一个关键方面是使用模拟全规模运行的小型中空纤维膜系统（具有自动液压反冲洗和化学清洗的恒定通量）。结垢指数基于串联电阻模型。使用来自两个自来水公司（A 和 B）和三个其他天然来源（寡营养、受藻华影响和废水受损）的水对两种不同的中空纤维膜类型（膜 A 和 B）进行了测试。实验室规模测试包括使用与公用事业 B 所用相同的膜。大多数污垢可通过液压反冲洗和化学清洗来逆转。小试规模系统的比通量和结垢指数高于全尺寸数据确定的值，但结垢指数比率相当，表明结垢性质相似。在相似的有机负荷下，污垢是特定于水源和膜类型的，即不可能概括水源的影响。将全尺寸数据与实验室尺寸数据进行比较，以验证污垢指数的使用。基于串联电阻的污垢指数是描述原水和预处理水、不同水源和不同膜类型的膜性能数据的有用工具。
This study evaluated the use of fouling indices to describe low pressure membrane fouling. One critical aspect of this study was the use of a bench-scale hollow fiber membrane system that imitated full-scale operation (constant flux with automatic hydraulic backwash and chemical cleaning). Fouling indices were based on a resistance-in-series model. Two different hollow fiber membrane types (membrane A and B) were tested with water from two water utilities (A and B) and three other natural sources (oligotrophic, algal bloom impacted, and wastewater impaired). The bench-scale testing included use of the same membrane as utilized at Utility B. Most fouling was reversible by hydraulic backwash and chemical cleaning. Specific flux and fouling indices for the bench-scale system were higher than those determined from full-scale data but fouling index ratios were comparable, suggesting a similar fouling nature. At similar organic loading, fouling was specific to water source and membrane type, i.e., no generalization on the impact of water source was possible. Full-scale data were compared with bench-scale data to validate the use of fouling indices. Fouling indices based on a resistance-in-series are useful tools to describe membrane performance data for both raw and pretreated water, for different water sources, and different membrane types.