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Moringa oleifera coagulation as pretreatment prior to microfiltration for membrane fouling mitigation

Abstract

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 pre-filtered MO coagulation pretreatment on the fouling mitigation in microfiltration (MF) process. MF treatment of a 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 6 h filtration period), the fouling mitigation level with MO coagulation was comparable to that with aluminium sulphate (alum) coagulation. In addition, major water quality (turbidity and colour) after MF treatment was 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 MF process in drinking water treatment.

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Publication details

The article was received on 25 Mar 2018, accepted on 03 Aug 2018 and first published on 06 Aug 2018


Article type: Paper
DOI: 10.1039/C8EW00186C
Citation: Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript
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    Moringa oleifera coagulation as pretreatment prior to microfiltration for membrane fouling mitigation

    R. Katalo, T. Okuda, L. Nghiem and T. Fujioka, Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8EW00186C

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