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Anionic polymer compound bioflocculant as a coagulant aid with aluminum sulfate and titanium tetrachloride
- Zhao, Y.X., Gao, B.Y., Shon, H.K., Wang, Y., Kim, J.-H., Yue, Q.Y., Bo, X.W.
- Bioresource technology 2012 v.108 pp. 45-54
- aluminum sulfate, coagulants, coagulation, dissolved organic carbon, equipment, fractal dimensions, lasers, polymers, regrowth, titanium
- The objectives of this study are to investigate the impacts of anionic polymer compound bioflocculant (CBF) as a coagulant aid on coagulation performance and floc characteristics with titanium tetrachloride (TiCl₄) and aluminum sulfate (Al₂(SO₄)₃). The effect of dosing sequence was also investigated. Floc size, breakage, regrowth and floc fractal dimension were examined using a laser diffraction instrument. The results showed that CBF with TiCl₄ or Al₂(SO₄)₃ coagulants exhibited synergistic effects by promoting dissolved organic carbon (DOC) removal. For both TiCl₄ and Al₂(SO₄)₃, the floc recoverability was improved by CBF addition, and the flocs formed by TiCl₄ and the corresponding dual-coagulants showed weaker recovery ability than those by Al₂(SO₄)₃ and the corresponding dual-coagulants. Fractal dimension analysis demonstrated that the floc fractal dimension values increased with the increasing coagulant dose. The effect of CBF on fractal dimension of the flocs generated by TiCl₄ was different from that of Al₂(SO₄)₃.