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The most severe problem in drinking water reservoirs is blue-green algae. Cyanophyceae cause offensive taste and odor in the drinking water. Results have
been published since 1974 showingClean-Flo continuous laminar flow inversion/ oxygenation and Clean-Flo buffered alum are both effective in reducing cyanophyceae growth (see references). A team of Mitsui engineers and scientists went to the U.S. in 1992 to test and study twenty lakes treated by Clean-Fl o Laboratories, Inc., Plymouth, Minnesota, or by Aquatic Biologists, Inc., Fond du Lac, Wisconsin, all using the Clean-Flo process. All lakes had good water quality, and a significant lack of blue-green algae. Also, the city of Kaohsiung, Taiwan solved their low oxygen, high ammonia, blue-green algae andbad taste and odor problem in their city drinking water using the Clean-Flo process in FengShan Reservoir in 1992.
Mitsui studied the Clean-Flo process in detail for two years at Shinobazu Lake, Ueno, Tokyo. We found considerable improvement in water quality, with reductions in phosphorus and nitrogen, increased dissolved oxygen, stabilization of pH, and an average of 15 cm bottom sediment removed at thirty test sites. The Clean-Flo process was initiated in March 1991.
From August 1990 to August 1992, total cyanophyceae cells in Shinobazu Lake declined from 89 percent of total algal cells to l7 percent. Total algal cells declined from 98,350 cells/100 ml to 47,040 cells/100 ml. Periodic influent nutrient loads, such as heavy rain runoff sometimes temporarily increased the total number of algal cells. Species of phytoplankton remained improved during these setbacks.
Results will be presented in detail at the 6th International Conference on the Conservation and Management of Lakes Kasumiguwa ‘95 (Japan) in October.
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References:
Bateman, J.M. and Laing, R.L. 1977. Restoration of water quality in Lake Weston, Orlando, Florida. J. of Aquatic Plant Management 15, pp 69-73.
Beduin, Robert J.1994. The effects of destratification aeration on five Minnesota lakes. Lake and Reservoir Management, 9(1):105-110. Proc. North American Lake Mangement Society, Seattle, WANov. 1993.
Carter, Cris C. 1977. Report on Clean-Flo Treatment of Tangerine Lake, Florida Game and Fresh Water Fish Commission, Eustis, Florida.
Cowell, B.C. and C.J. Dawes. 1984. Algal studies of eutrophic Florida lakes: The influence of aeration on the limnology of a central Florida lake and its potential as a lake restoration technique. Final Report Florida Dept. Nat. Res., Tallahassee, USA.
Kaleel, R 1. and A. L. Gabor. Feb. 1978. Lake Weston Restorative Evaluation. Orange County Pollution Control Dept., 29 pp. Trent, L. and Wm. McArthur. 1974. Results of testing Clean-Flo Lake Cleanser in Florida lakes. Hyacinth Control Jour. (Now Aquatic Plant Management Society) Vol. 12, p. 44-45.
Wenck N.C. and Albrecht, S. J. 1978. Preliminary Application for Moore Lake Restoration Grant under Section 314, |
