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    Coagulation performance and floc characteristics of polytitanium tetrachloride (PTC) compared with titanium tetrachloride (TiCl4) and ferric chloride (FeCl3) in algal turbid water

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    Type
    Article
    Authors
    Chekli, L.
    Eripret, C.
    Park, S.H.
    Tabatabai, S. Assiyeh Alizadeh cc
    Vronska, O.
    Tamburic, B.
    Kim, J.H.
    Shon, H.K. cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-11-11
    Online Publication Date
    2016-11-11
    Print Publication Date
    2017-03
    Permanent link to this record
    http://hdl.handle.net/10754/622281
    
    Metadata
    Show full item record
    Abstract
    Seasonal green algae blooms in freshwaters have raised attention on the need to develop novel effective treatment processes for the removal of algae in water. In the present study, the performance of newly developed polytitanium tetrachloride (PTC) coagulant for the removal of freshwater microalga Chlorella vulgaris has been investigated and compared with titanium tetrachloride (TiCl4) coagulant and the conventional ferric chloride (FeCl3) coagulant. The main benefit of using titanium-based coagulants is that the sludge produced after flocculation may be recycled into a valuable product: titanium dioxide photocatalyst. Both titanium-based coagulants achieved good flocculation over a broader pH range and coagulant dose compared to conventional FeCl3 coagulant. All three coagulants achieved comparable performance in terms of turbidity removal (i.e. turbidity removal efficiency >97%); although TiCl4 performed slightly better at the lower tested dose (i.e. <9 mg/L). Zeta potential measurements indicated that charge neutralisation may not be the sole mechanism involved in the coagulation of algae for all three coagulants. Analysis of the dynamic floc size variation during floc breakage showed no regrowth after floc breakage for the three coagulants. The flocs formed by both Ti-based coagulants were larger than those formed by FeCl3 and also grew at a faster rate. This study indicates that Ti-based coagulants are effective and promising coagulants for algae removal in water.
    Citation
    Chekli L, Eripret C, Park SH, Tabatabai SAA, Vronska O, et al. (2017) Coagulation performance and floc characteristics of polytitanium tetrachloride (PTC) compared with titanium tetrachloride (TiCl4) and ferric chloride (FeCl3) in algal turbid water. Separation and Purification Technology 175: 99–106. Available: http://dx.doi.org/10.1016/j.seppur.2016.11.019.
    Sponsors
    This work was supported by the SMEs Partnership Project for strengthening tech-competitiveness funded by Korea Small and Medium Business Administration in 2016 (Grant n° S2317919).
    Publisher
    Elsevier BV
    Journal
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2016.11.019
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S1383586616307304
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.seppur.2016.11.019
    Scopus Count
    Collections
    Articles; Water Desalination and Reuse Research Center (WDRC)

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