CS16 Harmful Algal Blooms
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
ASAEDA TAKASHI, A, T, Saitama University, Saitama, Japan, asaeda@post.saitama-u.ac.jp
TakeshiFT, Saitama Univeristy, Saitama, Japan, fujino@post.saitama-u.ac.jp
Eiichi, F, E, Environmental Hydraulic Institute, Ltd., Niiza, Japan, furusato@ah8.mopera.ne.jp
Yukihiko, K, Y, Karasawa Fine, Co., Ltd., Saitama, Japan, 
Experiment on removal of Microcystis aeruginosa by pressureizing impact
A new technique for the removal of blue-green algal blooming in shallow lake has been developed. The apparatus takes in water with colony, collapses the gas vacuole of cell by giving 0.3 MPa or greater of pressure, and divides large colony into small scale by opposed-jet collision in chamber. After passing through the chamber, all the colonies are settled to the bottom rapidly. This apparatus was applied for small, shallow reservoir and proved its performance. The death rate of pressurized and settled cells and nutrient elution speed in darkness were almost same as normal cells, because the treated cells by this method do not die out immediately. Furthermore, since the predator animal plankton can survive this pressurization (less than 0.7 MPa) and opposed-jet collision treatment, the present method is ecologically efficient in the suppression of the blue-green algal blooming.