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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. | URI: | https://hdl.handle.net/10356/86556 http://hdl.handle.net/10220/44070 |
ISSN: | 0011-9164 | DOI: | 10.1016/j.desal.2017.05.024 | Schools: | School of Civil and Environmental Engineering | Research Centres: | Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre |
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: [http://dx.doi.org/10.1016/j.desal.2017.05.024]. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | CEE Journal Articles NEWRI Journal Articles |
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