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Title: Gravity-driven microfiltration pretreatment for reverse osmosis (RO) seawater desalination: Microbial community characterization and RO performance
Authors: Wu, Bing
Suwarno, Stanislaus Raditya
Tan, Hwee Sin
Kim, Lan Hee
Hochstrasser, Florian
Chong, Tzyy Haur
Burkhardt, Michael
Pronk, Wouter
Fane, Anthony Gordon
Keywords: Biofouling
Assimilable organic carbon
Issue Date: 2017
Source: Wu, B., Suwarno, S. R., Tan, H. S., Kim, L. H., Hochstrasser, F., Chong, T. H., et al. (2017). Gravity-driven microfiltration pretreatment for reverse osmosis (RO) seawater desalination: Microbial community characterization and RO performance. Desalination, 418, 1-8.
Series/Report no.: Desalination
Abstract: A pilot gravity-driven microfiltration (GDM) reactor was operated on-site for over 250 days to pretreat seawater for reverse osmosis (RO) desalination. The microbial community analysis indicated that the dominant species in the pilot GDM system (~ 18.6 L/m2 h) were completely different from those in the other tested GDM systems (~ 2.7–17.2 L/m2 h), operating on the same feed. This was possibly due to the differences in available space for eukaryotic movement, hydraulic retention time (i.e., different organic loadings) or operation time (250 days vs. 25–45 days). Stichotrichia, Copepoda, and Pterygota were predominant eukaryotes at genus level in the pilot GDM. Furthermore, the GDM pretreatment led to a significantly lower RO fouling potential in comparison to the ultrafiltration (UF) system. This was attributed to the fact that GDM filtration produced a permeate with less amount of assimilable organic carbon (AOC) and biopolymers. Accordingly, lower amount of organic foulants (biopolymers and low molecular weight neutrals) and less biofilm formation on the GDM-RO membrane were observed. Although α-proteobacteria were dominant in both RO fouling layers, their bacterial community compositions at genus level were significantly different. Thalassobius had higher abundance in the GDM-RO fouling layers, while Erythrobacter and Hyphomonas were more predominant in the UF-RO fouling layers.
ISSN: 0011-9164
DOI: 10.1016/j.desal.2017.05.024
Rights: © 2017 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Desalination, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles

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