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Membranes 2018, 8(1), 7; https://doi.org/10.3390/membranes8010007

Impact of the Interaction between Aquatic Humic Substances and Algal Organic Matter on the Fouling of a Ceramic Microfiltration Membrane

1
Chemical and Environmental Engineering Department, School of Engineering, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
2
Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, Korea
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 25 January 2018 / Accepted: 29 January 2018 / Published: 1 February 2018
(This article belongs to the Section Membrane Applications in Water Treatment)
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Abstract

The influence of the interaction between aquatic humic substances and the algal organic matter (AOM) derived from Microcystis aeruginosa on the fouling of a ceramic microfiltration (MF) membrane was studied. AOM alone resulted in a significantly greater flux decline compared with Suwannee River humic acid (HA), and fulvic acid (FA). The mixture of AOM with HA and FA exhibited a similar flux pattern as the AOM alone in the single-cycle filtration tests, indicating the flux decline may be predominantly controlled by the AOM in the early filtration cycles. The mixtures resulted in a marked increase in irreversible fouling resistance compared with all individual feed solutions. An increase in zeta potential was observed for the mixtures (becoming more negatively charged), which was in accordance with the increased reversible fouling resistance resulting from enhanced electrostatic repulsion between the organic compounds and the negatively-charged ceramic membrane. Dynamic light scattering (DLS) and size exclusion chromatography analyses showed an apparent increase in molecular size for the AOM-humics mixtures, and some UV-absorbing molecules in the humics appeared to participate in the formation of larger aggregates with the AOM, which led to greater extent of pore plugging and hence resulted in higher irreversible fouling resistance. View Full-Text
Keywords: humic acid; fulvic acid; algal organic matter; microfiltration; ceramic membrane; fouling humic acid; fulvic acid; algal organic matter; microfiltration; ceramic membrane; fouling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhang, X.; Fan, L.; Roddick, F.A. Impact of the Interaction between Aquatic Humic Substances and Algal Organic Matter on the Fouling of a Ceramic Microfiltration Membrane. Membranes 2018, 8, 7.

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