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Research Article| September 01 2007 Developments of high rate dissolved air flotation for drinking water treatment James K. Edzwald James K. Edzwald 1Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY, 13699-5710, USA E-mail: jedzwald@clarkson.edu Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2007) 56 (6-7): 399–409. https://doi.org/10.2166/aqua.2007.013 Article history Received: April 05 2007 Accepted: June 19 2007 Views Icon Views Article contents Figures Developments of high rate dissolved air flotation for drinking water treatment. Journal of Water Supply: Research and Technology-Aqua 1 September 2007; 56 (6-7): 399–409. doi: https://doi.org/10.2166/aqua.2007.013 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Since the mid 1990s there has been a large increase in the hydraulic loading rates used to design dissolved air flotation (DAF) facilities for drinking water applications. High rate DAF processes are now available at loading rates of 20 to 40 m h−1. These high rate systems have a smaller plant footprint compared to conventional systems. The paper examines bubble and floc-bubble rise rates, and how the simple theory relating these rise rates to the hydraulic loading of the DAF separation zone is inadequate. It is shown for high rate systems that the flow through the separation zone is stratified and must be accounted for in relating separation zone efficiency to the hydraulic loading and bubble or floc-bubble rise rates. A conceptualized stratified flow model is used to explain why DAF tanks can be designed with hydraulic loadings >20 m h−1. bubble rise rates, dissolved air flotation, drinking water, floc-bubble rise rates, high rate flotation, separation zone This content is only available as a PDF. © IWA Publishing 2007 You do not currently have access to this content.
James K. Edzwald (Sat,) studied this question.