Development of a boat equipped with UV lamps for suppression of freshwater red tide in a reservoir.

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  • Development of a Boat Equipped with UV

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A boat equipped with UV lamps was developed to suppress freshwater red tide of the dinolagellate Peridinium bipes. The boat had two pipes at the center of the bottom with 20 UV lamps installed inside each pipe. The surface lake water was directed into the pipes and expelled. UV radiations for over 20 seconds were enough to kill 100% of the cells of the freshwater red tide when the concentration was less than 5.0×103 cells⋅ml-1 while over 50 seconds were required to ki11 90% of the cells when the concentration was more than 1.0×104 cells⋅ml-1. Optimal velocity of the lake water in the pipes was regulated automatically between 17 to 35 cm sec-1 depending upon the cell density ranging between 2.0×103 to 2.3×104 cells⋅ml-1 to kill over 99% of the total cells. This boat could treat a maximum of about 700m3h-1 of lake water and required 5 hours to treat 2.0×104 m2 of surface areaof lake water containing 1.0×103 to 5.0×104peridirium bipes cells ml-1. The quantity of water treated per hour was 10 times as much as the long hair filtration method which iscommonly used.

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