Comparison of coagulation behaviour and floc characteristics of polyaluminium chloride (PAX 18, PAX XL19H, ALCAT) with surface water treatment

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Coagulation behaviour of polyaluminium chloride (PACl) was comparatively investigated in terms of the removal of turbidity and colour with surface water. The growth of flocs was also compared. The results show that the decrease in saturation and values of dissolved oxygen was ca. 20% for ALCAT and PAX 18 at both dosages and 15% for PAX XL 19H, respectively. The floc formation growth indicated that PACl coagulation occurred not only by charge neutralization but also by a form of sweep flocculation. Besides, flocs formed by ALCAT had better sizes than the flocs formed by PAX 18 and PAX XL19H. The rate of sedimentation was stable during coagulation with higher doses, and it was dependent on the substance used.

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  • Aguilar M.I. Saez J. Llorens M. Soler A. Ortuno J.F. 2003 Microscopic observation of particle reduction in slaughterhouse wastewater by coagulation-flocculation using ferric sulphate as coagulant and different coagulant aids Water Res. 3799): 2233-2241.

  • Biggs C.A. Lant P.A. 2000 Activated sludge flocculation: on-line determination of floc size and the effect of shear Water Res. 34(9): 2542-2550.

  • Boller M. Blaser S. 1998 Particles under stress Water Sci. Technol. 37(10): 9-29.

  • Chaignon V. Lartiges B.S. El Samrani A. Mustin C. 2002 Evolution of size distribution and transfer of mineral particles between flocs in activated sludges: an insight into floc exchange dynamics Water Res. 36(3): 476-484.

  • Cleasby J.L. Logsdon G.S. 1999 Granular Bed and Precoat Filtration [in:] American Water Works Association (Letterman R.D. tech. ed.) Water Quality and Treatment: A Handbook of Community Suppliers McGraw -Hill New York: 8.1-99.

  • Conley D.J. Paerl H.W. Howarth R.W. Boesch D.F. Seitzinger S.P. Havens K.E. Lancelot C. Likens G.E. 2009 Ecology: controlling eutrophication: nitrogen and phosphorus Science 323 (5917): 1014-1015.

  • Cooke G.D. Welch E.B. Peterson S.A. Newroth P.R. 1993 Restoration and Management of Lakes and Reservoirs Lewis Publ. Boca Raton p. 548.

  • Ducoste J.J. Clark M.M. 1998 The influence of tank size and impeller geometry on turbulent flocculation: I. Experimental Environ. Eng. Sci. 15(3): 215-224.

  • Francois R.J. 1987 Strength of aluminium hydroxide flocs Water Res. 21(9): 1023-1030.

  • Haghseresht F. Wang S. Do D.D. 2009 A novel lanthanummodified bentonite Phoslock for phosphate removal from wastewaters Appl. Clay Sci. 46: 369-375

  • Hanson P.C. Carpenter S.R. Armstrong D.E. Emily H. Stanley E.H. Kratz T.K. 2006 Lake dissolved inorganic carbon and dissolved oxygen: changing drivers from days to decades Ecol. Monogr. 76(3): 343-363.

  • Harris G. P. 1997 Algal biomass and biogeochemistry in catchments and aquatic ecosystems: scaling of processes models and empirical tests Hydrobiologia 349: 19-26.

  • Li T. Zhu Z. Wang D. Yao C. Tang H. 2007 The strength and fractal dimension characteristics of alum-kaolin flocs Int. J. Miner. Process. 82: 23-29.

  • Özkundakci D. Hamilton D.P. Scholes P. 2010 Effect of intensive catchment and in-lake restoration procedures on phosphorus concentrations in a eutrophic lake Ecol. Eng. 36(4): 396-405.

  • Parker D.S. Kaufman W.J. Jenkins D. 1972 Floc breakup in turbulent flocculation processes J. Sanit. Eng. Div. 98: 79-99.

  • Rydin E. Welch E.B. 1998 Aluminum dose required to inactivate phosphate in lake sediments Water Res. 32(10): 2969-2976.

  • Spicer P.T. Pratsinis S.E. 1996 Shear-induced flocculation: the evolution of floc structure and the shape of the size distribution at steady state Water Res. 30(5): 1049-1056.

  • Yu W.Z. Li G.B. Xu Y.P. 2009 Breakage and re-growth of flocs formed by alum and PACl Powder Technol. 189: 439-443.

  • Zhao Y.X. Gao B.Y. Cao B.C. Yanga Z.L. Yue Q.Y. Shon H.K. Kim J-H. 2011 Comparison of coagulation behavior and floc characteristics of titanium tetrachloride (TiCl4) and polyaluminum chloride (PACl) with surface water treatment Chem. Eng. J. 166(2): 544-550

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