Effect of Pretreatment on Subsequent Water Treatment Processes
Publication: Journal of Environmental Engineering
Volume 134, Issue 6
Abstract
The effect of chlorine dioxide pretreatment on subsequent treatment processes (coagulation, flocculation, sedimentation, filtration, and ozonation) was studied at pilot-scale at the Upper San Leandro Water Treatment Plant near Oakland, Calif. Potential impacts of on the distribution system were also studied at bench scale using simulated distribution system (SDS) tests. Pilot trials were conducted with one train operating without pretreatment (Train 1) and the other with a dose of between 0.6 and (Train 2). Comparison between Trains 1 and 2 showed that pretreatment resulted in a 0.1–0.2 NTU decrease in settled water turbidity when compared to no pretreatment. pretreatment also resulted in a small decrease in ultraviolet absorbance at . Following sedimentation, about 60% of the applied formed chlorite , with 10–20% forming chlorate . Ozonation immediately converted all residual and to . There was no significant difference in the performance of the filters between the two trains in terms of headloss, particle count, and turbidity. Bench-scale SDS tests indicated that chlorine dioxide preoxidation did not affect subsequent chloramine stability or concentrations of trihalomethanes, haloacetic acids, or adsorbable organic halides in the distribution system.
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Acknowledgments
This work was funded as part of American Water Works Association Research Foundation (AwwaRF) Project No. 2843. AwwaRF is the joint owner of the technical information upon which this manuscript is based. The writers thank the AwwaRF for its financial, technical, and administrative assistance in funding and managing the project through which this information was discovered. The comments and views detailed herein may not necessarily reflect the views of the AWWA Research Foundation, its officers, directors, affiliates, or agents.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 134 • Issue 6 • June 2008
Pages: 478 - 485
Copyright
© 2008 ASCE.
History
Received: Jun 2, 2006
Accepted: Oct 18, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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