Moringa oleifera coagulation as pretreatment prior to microfiltration for membrane fouling mitigation
Moringa oleifera coagulation as pretreatment prior to microfiltration for membrane fouling mitigation
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辣木混凝作为微滤前的预处理，以减轻膜污染
DOI：
10.1039/c8ew00186c
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Fujioka Takahiro
中科院分区：
文献类型：
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作者：
Katalo Ronald;Okuda Tetsuji;Nghiem Long D.;Fujioka Takahiro
辣木（Moringa oleifera，MO）是一种天然混凝剂，在饮用水处理中打破了传统的铝盐或铁盐化学混凝，是一种有吸引力的方法。本研究旨在评估使用预过滤MO的混凝预处理对微滤（MF）过程中的污垢减轻的效果。MF处理河水未经预处理促进了相当大的减少膜渗透性（即膜污染），这是不充分的恢复，通过常规的反冲洗。相比之下，MF处理后MO混凝大大减少膜污染。在六个过滤周期（或6小时的过滤周期），污垢减轻水平与MO凝聚与硫酸铝（明矾）凝聚。此外，MF处理后的主要水质参数（浊度和色度）之间的MO和明矾混凝相当。通过MO混凝的预处理具有在MF处理之后保持水的pH的优点。这里得到的结果表明，MO混凝可以作为一种有效的和低成本的污染缓解技术的饮用水处理MF过程。
Coagulation using Moringa oleifera (MO), a natural coagulant, is an attractive approach in drinking water treatment to break away from conventional chemical coagulation using aluminium or iron salts. This study aimed to evaluate the effect of coagulation pretreatment using pre-filtered MO on the fouling mitigation in the microfiltration (MF) process. MF treatment of river water without pretreatment promoted a considerable reduction in membrane permeability (i.e. membrane fouling), which was not sufficiently recovered by conventional backwashing. In contrast, MF treatment after MO coagulation substantially reduced membrane fouling. Over six filtration cycles (or a 6 h filtration period), the fouling mitigation level with MO coagulation was comparable to that with aluminium sulphate (alum) coagulation. In addition, the major water quality parameters (turbidity and colour) after MF treatment were equivalent between MO and alum coagulation. Pretreatment by MO coagulation has an advantage of maintaining water pH after MF treatment. The results obtained here suggest that MO coagulation can be employed as an effective and low-cost fouling mitigation technique for the MF process in drinking water treatment.