Abstract
Coagulants, flocculation time and mixing intensity were examined in laboratory studies using a synthetic fulvic acid water and three Swedish water supplies. Alum and polyaluminium chlorides (PACs) of various chemistries were effective when used under favorable pretreatment conditions. Alum and PACs had approximately the same optimum dosages for the fulvic acid water when expressed as mg Al added per mg TOC. An exception was the Ca PAC had a lower optimum dose at higher pH. The PACs were effective at flocculation times as low as 5 min while 10 min was needed with alum, especially in cold waters. Dissolved air flotation (DAF) performance improved slightly with increasing flocculation mixing intensity. DAF performed better than settling for aquatic humic or algae type supplies especially with lower flocculation times, and performed better for a river water with turbidity under cold water conditions. Excellent DAF treatment was achieved with Ca, Si, and sulfate PACs.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Literatur
Edzwald, J.K., Malley, J.P. Jr., Yu, C.: A Conceptual Model for Dissolved Air Flotation in Water Treatment. Water Supply 8 (1990) 141.
Malley, J.P. Jr., Edzwald, J.K.: Laboratory Comparison of DAF with Conventional Treatment. J. Amer. Wat. Works Assoc. 83(9) (1991) 56.
Edzwald, J.K., Wingler, B.J.: Chemical and Physical Aspects of Dissolved Air Flotation for the Removal of Algae. J. Wat. Supply Research Techn. (Aqua) 39 (1990) 24.
Hyde, R.A., et al.: Clarification by Flotation. J. Amer. Wat. Works Assoc. 69(7) (1977) 69.
Zabel, T.: Flotation in Water Treatment. In: The Scientific Basis of Flotation, K.J. Ives (Ed). Martinas Nijhoff, Boston 1984, pp. 349–377.
Zabel, T.: The Advantages of Dissolved Air Flotation for Water Treatment. J. Amer. Wat. Works Assoc. 77(5) (1985) 42.
Heinänen, J.: Use of Dissolved Air Flotation in Potable Water Treatment in Finland. Aqua Fennica 18(2) (1988) 113.
Edzwald, J.K., Walsh, J.P., Kaminski, G.S., Dunn, H.J.: Flocculation and Air Requirements for Dissolved Air Flotation. J. Amer. Wat. Works Assoc. 84(3) (1992) 92.
Janssens, J.G.: Developments in Coagulation, Flocculation and Dissolved Air Flotation. Wat. Engineer. Management 139(1) (1992) 26.
Janssens, J.G.: The Application of Dissolved Air Flotation in Drinking Water Production. In: Particular for Removing Algae. Proceedings of DVGW-Schriftenreihe Wasser Nr. 67, Eschborn 1991.
Ødegaard, H.: Engineering Aspects of Flocculation. In: Chemical Water and Wastewater Treatment, A. Grohmann, H.H. Hahn and R. Klute (Eds.). Fischer, New York 1985, pp.81–102.
Edzwald, J.K., Van Benschoten, J.B.: Aluminium Coagulation of Natural Organic Matter. In: Chemical Water and Wastewater Treatment, H.H. Hahn and R. Klute (Eds). Springer, Berlin Heidelberg New York 1990, pp. 341–359.
Van Benschoten, J.E., Edzwald, J.K.: Chemical Aspects of Coagulation Using Aluminium Salts: 2. Coagulation of Fulvic Acid Using Alum and Polyaluminium Chloride. Wat. Res. 24 (1990) 1527.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1994 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Edzwald, J.K., Bunker, D.Q., Dahlquist, J., Gillberg, L., Hedberg, T. (1994). Dissolved Air Flotation: Pretreatment and Comparisons to Sedimentation. In: Klute, R., Hahn, H.H. (eds) Chemical Water and Wastewater Treatment III. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79110-9_1
Download citation
DOI: https://doi.org/10.1007/978-3-642-79110-9_1
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-79112-3
Online ISBN: 978-3-642-79110-9
eBook Packages: Springer Book Archive