Control Strategies for the Mitigation and Removal of Attached Manganese Biofilms
Publication: Journal of Environmental Engineering
Volume 144, Issue 1
Abstract
Biofilm formation and manganese oxidizing bacteria (MOBs) in water transmission and distribution systems can lead to a wide array of water quality issues, operational problems, and negative hydraulic impacts. To investigate possible methods to control biofilm formation, a study using chlorine dioxide () and sodium hypochlorite (NaOCl) was performed with rotating annular reactors (ARs). Results showed that low ( as ) and high ( as ) doses of , and as of NaOCl, were effective at mitigating biofilm to different extents by oxidizing readily available dissolved manganese (Mn) and iron (Fe) and/or inactivating biofilm populations. The most effective biofilm control strategy tested was a dose of NaOCl, which provided significant reductions of suspended bacteria (2.1 log reduction), established biofilm (2.5 log reduction), and new biofilm growth (3.2 log reduction). Results from this study suggest that the implementation of treatment strategies for the control of existing and future biofilms should consider both (1) the removal of readily available metals by oxidation, and (2) the direct inactivation of attached bacteria.
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Acknowledgments
This research was funded by the New York City Department of Environmental Protection. The work was performed in cooperation with the Environmental Engineering Department at Manhattan College and the Joint Venture of Hazen and Sawyer and CDM. Special thanks to the Millwood Water Treatment Plant personnel for providing Catskill Aqueduct raw water, and to Dr. Ron Hofmann of the Civil Engineering Department at the University of Toronto for providing demand and DBP data shown in Fig. 4. This work was made possible through the vision and support of Thomas McEnerney of Hazen and Sawyer.
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 1 • January 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 11, 2016
Accepted: Jun 12, 2017
Published online: Nov 11, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 11, 2018
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