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首页> 外文期刊>International Journal of Environmental Research and Public Health >Comparative Evaluation of Aluminum Sulfate and Ferric Sulfate-Induced Coagulations as Pretreatment of Microfiltration for Treatment of Surface Water
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Comparative Evaluation of Aluminum Sulfate and Ferric Sulfate-Induced Coagulations as Pretreatment of Microfiltration for Treatment of Surface Water

机译：硫酸铝和硫酸铁诱导混凝作为微滤预处理地表水的比较评价

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摘要

Two coagulants, aluminum sulfate and ferric chloride, were tested to reduce natural organic matter (NOM) as a pretreatment prior to polyvinylidene fluoride (PVDF) microfiltration (MF) membranes for potable water treatment. The results showed that the two coagulants exhibited different treatment performance in NOM removal. Molecular weight (MW) distributions of NOM in the tested surface raw water were concentrated at 3–5 kDa and approximately 0.2 kDa. Regardless of the coagulant species and dosages, the removal of 0.2 kDa NOM molecules was limited. In contrast, NOM at 3–5 kDa were readily removed with increasing coagulant dosages. In particular, aluminum sulfate favorably removed NOM near 5 kDa, whereas ferric chloride tended to reduce 3 kDa organic substances. Although aluminum sulfate and ferric chloride could improve the flux of the ensuing MF treatment, the optimal coagulant dosages to achieve effective pretreatment were different: 2–30 mg/L for aluminum sulfate and >15 mg/L for ferric chloride. The scanning electron microscope (SEM) image of the membrane-filtered coagulated raw water showed that coagulation efficiency dramatically affected membrane flux and that good coagulation properties can reduce membrane fouling.
机译：在聚偏二氟乙烯（PVDF）微滤（MF）膜用于饮用水处理之前，对两种凝结剂硫酸铝和氯化铁进行了测试，以减少天然有机物（NOM）的预处理。结果表明，两种凝结剂在去除NOM方面表现出不同的处理性能。被测表面原水中NOM的分子量（MW）分布集中在3-5 kDa和约0.2 kDa。无论凝结剂种类和剂量如何，0.2 kDa NOM分子的去除都受到限制。相反，随着凝结剂剂量的增加，可以轻松去除3–5 kDa的NOM。特别地，硫酸铝有利地去除了5kDa附近的NOM，而氯化铁倾向于减少3kDa的有机物质。尽管硫酸铝和氯化铁可以提高随后的MF处理的通量，但实现有效预处理的最佳混凝剂剂量却有所不同：硫酸铝为2–30 mg / L，氯化铁为> 15 mg / L。膜过滤后的凝结原水的扫描电子显微镜（SEM）图像显示，凝结效率极大地影响了膜通量，良好的凝结特性可以减少膜结垢。

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