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Title: Impact of isolated dissolved organic fractions from seawater on biofouling in reverse osmosis (RO) desalination process
Authors: Yin, Wenqiang
Ho, Jia Shin
Cornelissen, Emile R.
Chong, Tzyy Haur
Keywords: Engineering::Environmental engineering
Issue Date: 2020
Source: Yin, W., Ho, J. S., Cornelissen, E. R. & Chong, T. H. (2020). Impact of isolated dissolved organic fractions from seawater on biofouling in reverse osmosis (RO) desalination process. Water Research, 168, 115198-.
Journal: Water Research
Abstract: The biofouling potential of three isolated dissolved organic fractions from seawater according to their molecular weights (MWs), namely, fractions of biopolymers (F.BP, MW > 1000 Da), humic substances and building blocks (F.HS&BB, MW 350-1000 Da), and low molecular weight compounds (F.LMW, MW < 350 Da) were characterized by assimilable organic carbon (AOC) content. The AOC/DOC ratio was in the order of F.LMW (∼35%) > F.BP (∼19%) > F.HS&BB (∼8%); AOC/DOC of seawater was ∼20%; organic compositions of seawater were BP ∼6%, HS&BB ∼52% and LMW ∼42%; LMW accounted for >70% of AOC in seawater. Their impact on SWRO biofouling in term of flux decline rate was in the order of F. LMW (∼30%) > F.BP (∼20%) > F.HS&BB (<10%). Despite being the major organic compound in seawater, HS&BB showed marginal effect on biofouling. The role of indigenous BP was less critical owing to its relatively low concentration. LMW, which was the major AOC contributor, played a significant role in biofouling by promoting microbial growth that contributed to the build-up of soluble microbial products and exopolymeric substances (i.e., in particular BP). Therefore, seawater pretreatment shall focus on the removal of AOC (i.e., LMW) rather than the removal of biopolymer.
ISSN: 0043-1354
DOI: 10.1016/j.watres.2019.115198
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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