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Impact of isolated dissolved organic fractions from seawater on biofouling in reverse osmosis (RO) desalination process
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. Wat. Res. 168: 115198. https://dx.doi.org/10.1016/j.watres.2019.115198
In: Water Research. Elsevier: Oxford; New York. ISSN 0043-1354; e-ISSN 1879-2448, more
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    Biofouling potential; Seawater desalination; Reverse osmosis; Naturalorganic matter; Assimilable organic carbon; Organic transformation
Authors  Top 
  • Yin, W.
  • Ho, J.S.
  • Cornelissen, E.R., more
  • Chong, T.H.
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 (similar to 35%) > F.BP (similar to 19%) > F.HS&BB (similar to 8%); AOC/DOC of seawater was similar to 20%; organic compositions of seawater were BP similar to 6%, HS&BB similar to 52% and LMW similar to 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 (similar to 30%) > F.BP (similar to 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.
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