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    Assessment of silt density index (SDI) as fouling propensity parameter in reverse osmosis (RO) desalination systems

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    Type
    Article
    Authors
    Rachman, Rinaldi
    Ghaffour, NorEddine cc
    Wali, F.
    Amy, Gary L.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2013-01
    Permanent link to this record
    http://hdl.handle.net/10754/562584
    
    Metadata
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    Abstract
    Due to its simplicity, silt density index (SDI) is extensively used in reverse osmosis systems despite its limitations in predicting membrane fouling. Employing a reliable fouling index with good reproducibility and precision is necessary. The aim of this investigation is to assess the reliability of SDI in order to understand the reasons for the low level of precision and accuracy. Different commercial SDI membranes and feed water quality were used in this study. Results showed the existence of membrane properties' variation within manufacturers, which then causes a lack of accuracy in fouling risk estimation. The nature of particles during SDI filtration provides information that particle concentration and size play a significant role in SDI quantification with substantial representation given by particles with size close to membrane nominal pore size. Moreover, turbidity-assisted SDI measurements along with determination of ultrafiltration permeate and clean water fouling potential, establish the indication of nonfouling-related phenomena involved on SDI measurement such as natural organic matter adsorption and hydrodynamic conditions that alters during filtration. Additionally, it was found that the latter affects the sensitivity of SDI by being represented by some portions of SDI values. © 2013 Desalination Publications.
    Publisher
    Informa UK Limited
    Journal
    Desalination and Water Treatment
    DOI
    10.1080/19443994.2012.699448
    ae974a485f413a2113503eed53cd6c53
    10.1080/19443994.2012.699448
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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