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Cho, Jaeweon
OWIELAB(Organic-Water Interface Engineering Laboratory)
Research Interests
  • Convergence of Science and Arts, Feces Standard Money (FSM), Water & Energy

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Recovery of sludge produced from Ti-salt flocculation as pretreatment to seawater reverse osmosis

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Title
Recovery of sludge produced from Ti-salt flocculation as pretreatment to seawater reverse osmosis
Author
Okour, Y.El Saliby, I.Shon, H. K.Vigneswaran, S.Kim, J. -H.Cho, JaeweonKim, In S.
Keywords
Filtration; Flocculation; Organic matter; Photocatalytic activity; Pretreatment; Sludge recovery; Titanium dioxide (TiO2)
Issue Date
2009-10
Publisher
ELSEVIER SCIENCE BV
Citation
DESALINATION, v.247, no.1-3, pp.53 - 63
Abstract
In this study, titanium tetrachloride (TiCl(4)), titanium sulfate (Ti(SO(4))(2)) and ferric chloride (FeCl(3)) flocculation as a pretreatment to seawater reverse osmosis (SWRO) were investigated. Their ability to remove turbidity, seawater organic matter (SWOM) and controlling the feed water quality of SWRO was evaluated. Flux decline of SWRO and membrane autopsy were studied. Titanium dioxide (TiO(2)) produced from sludge after Ti-salt flocculation was characterized in terms of particle structure and photocatalytic activity. A hybrid system of flocculation followed by granular activated carbon (GAC) filtration was employed to remove the suspended micro-flocs after different flocculations. The optimum dose of 10 mg/L TiCl(4) and FeCl(3) were used. The turbidity removal for the three coagulants was marginal at different doses at pH 6 and 8. Flocculation followed by GAC filtration significantly reduced the turbidity values from 1.5 NTU to about 0.35 NTU using TiCl(4) and 0.40 using FeCl(3). Silt density index (SDI(15)) was also decreased from 5.0 to 4.2 and 4.7, respectively. Removal of dissolved organic carbon (DOC), colour and UV absorbance after TiCl(4) and flocculation followed by GAC filtration was found to be effective and similar. TiO(2) produced from sludge showed very high photocatalytic activity under UV-irradiation. Acetaldehyde was completely removed after 45 min photocatalytic reaction
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DOI
10.1016/j.desal.2008.12.012
ISSN
0011-9164
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UEE_Journal Papers
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