Water Science & Technology Vol 55 No 1-2 pp 321–327 © IWA Publishing 2007 doi:10.2166/wst.2007.057
Vertical profile of algal distribution during aeration prior to intake tower for safe drinking water
H.K. Kim*, J.M. Kim*, Y.J. Lee*, B.I. Kim*, B.C. Lee** and N.I. Chang*
*Youngsan River Water Research Lab., National Institute of Environmental Research, 1110-8 Oryong-dong, Buk-gu, Gwangju, 500-480, Korea (E-mail: khk228@me.go.kr)
**Water Environment and Remediation Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, 130-650, Korea
ABSTRACT
Blue-green algae or cyanobacteria comprise a diverse group of organisms, all of which generate potent natural toxins, as well as characteristic odours. In particular, blue-green algae, such as Microcystis and Anabaena, are often detected abundantly in surface water used as a drinking water resource. In order to confirm our ability to provide safe drinking water even during a water bloom, we have conducted an investigation into the vertical distribution of algae during aeration prior to entry into the intake tower at a dam site. Our analysis of the vertical algal distribution during aeration indicated that aeration occurring at the intake tower exerts a significant influence on the safety of the drinking water. It was determined that the discontinuation of aeration and an increase in the depth at which water intake is conducted, constitutes a viable strategy for the maintenance of toxin- and odour-free drinking water, particularly during water bloom events.
Keywords: Aeration; Anabaena sp; blue-green algae; drinking water; intake tower
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