Abstract
Effects of mechanical mixing and ultrasonic wave applied on freshwater samples containing water bloom particles previous to their submission to ozone and UV-C were investigated. Both mechanical treatments effectively reduced chl. a contents and photosynthetic ability and increased transparency of the water samples treated with UV-C. However, mixing treatment was the most powerful. Inactivation effect by ozone was not fairly obtained even with mechanical treatments. However, under the conditions of UV-C treatment in these experiments, complete inactivation effect was not possible on water samples containing algal chl. a higher than 140μg/L.
