Comparing Hydrolyzing to Prehydrolyzed Coagulants for Treatment of a Florida Slough
Publication: Journal of Environmental Engineering
Volume 142, Issue 2
Abstract
Bench-scale jar testing was conducted to compare the cost and performance of three hydrolyzing and two prehydrolyzed coagulants for treatment of an organic-laden ( total organic carbon) surface water slough. Coagulant dose and pH were varied between 80 and and 4 and 8 pH units, respectively. Dissolved organic carbon (DOC) removal performance data were depicted graphically and modeled using empirical regressions. Ferric chloride and aluminum chlorohydrate achieved the highest organic removal (85 and 70%, respectively) and color reduction (98 and 97%, respectively) at dose concentrations of as and as polyaluminum hydroxychloride, respectively. Cost diagrams were developed using DOC removal performance data. Ancillary effects including alkalinity retention, settling time, and sludge settling rates were also considered in this comparison. This research provides insight regarding the relationship between process conditions and the advantages of using prehydrolyzed coagulants for DOC and color removal from surface water.
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Acknowledgments
The research reported herein was funded cooperatively by Sarasota County Government (Sarasota, Florida) and the Southwest Florida Water Management District (SWFWMD) (Brooksville, Florida) through its consultants, Carollo Engineers (Sarasota, Florida) via UCF agreement 16208098. The authors are grateful for the contributions of UCF students Christopher Boyd, Alyssa Filippi, Nick Webber, and Jayapregasham Tharamapalan. The authors wish to acknowledge the assistance of Maria Real-Robert. The comments and opinions expressed herein may not necessarily reflect the views of the officers, directors, or affiliates of Sarasota County Government, SWFWMD, Carollo Engineers, or of the University of Central Florida. MINITAB and any other trademarks and logos for the Company’s products and services are the exclusive property of Minitab Inc. Other marks referenced remain the property of their respective owners. See www.minitab.com/en-us/ for more information.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 15, 2014
Accepted: Jul 10, 2015
Published online: Sep 8, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 8, 2016
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