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Water 2017, 9(10), 775; doi:10.3390/w9100775

A Physical Pre-Treatment Method (Vertical Weir Curtain) for Mitigating Cyanobacteria and Some of Their Metabolites in a Drinking Water Reservoir

1
Department of Environmental Health Science, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
2
Department of Environmental Science, Hanyang University, Seoul 04763, Korea
3
ECOSTAR Ltd., 265 Jungdae-ro, Songpa-gu, Seoul 05660, Korea
4
Department of Life Science, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
5
National Institute of Environmental Research, 42, Hwangyong-ro, Seo-gu, Incheon 22689, Korea
*
Authors to whom correspondence should be addressed.
Received: 27 August 2017 / Revised: 24 September 2017 / Accepted: 3 October 2017 / Published: 11 October 2017
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Abstract

Harmful cyanobacteria and their metabolites often contaminate drinking water resources, and effective control remains challenging. Here, we developed a physical algal pre-treatment method, the vertical weir curtain (VWC), to mitigate cyanobacteria and some of their metabolites (geosmin, 2-methylisoborneol (2-MIB), and microcystins) in situ and evaluated its performance in a raw water reservoir used for drinking water supply. The VWC was manufactured with two fibrous polypropylene mats (0% and 92% porosity) which were mounted to maintain a constant underwater depth. We installed the VWC to cover the entire epilimnion of the drinking water intake zone and monitored its efficiency during an algal bloom period (July–October 2015). Reduction rates were 40–59% for total algae, 60–75% for cyanobacteria, 23–55% for geosmin, 30–51% for 2-MIB, and 47–89% for microcystin-LR during the study period. Significant reductions were observed in the shallow layer of the water column (1–3 m water depth), particularly during August, when cyanobacterial density was the highest. The results indicate that the VWC can effectively mitigate harmful cyanobacteria and their metabolites when suitably applied, serving as a valuable reference for the algal reduction in raw drinking water resources. View Full-Text
Keywords: cyanobacteria; drinking water; microcystins; odor compounds; pre-treatment; vertical weir curtain cyanobacteria; drinking water; microcystins; odor compounds; pre-treatment; vertical weir curtain
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Park, C.-H.; Park, M.-H.; Kim, K.-H.; Kim, N.-Y.; Kim, Y.-H.; Gwon, E.-M.; Kim, B.-H.; Lim, B.-J.; Hwang, S.-J. A Physical Pre-Treatment Method (Vertical Weir Curtain) for Mitigating Cyanobacteria and Some of Their Metabolites in a Drinking Water Reservoir. Water 2017, 9, 775.

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