BIODEGRADATION OF MICROCYSTIS AND MICROCYSTINS BY INDIGENOUS NANOFLAGELLATES ON BIOFILM IN A PRACTICAL TREATMENT FACILITY

The potential for degradation of Microcystis and microcystins by organisms in biofilm in a practical biological treatment facility combined with conventional treatment processes was examined. Viable cells of Microcystis viridis, which produced microcystin LR, RR and YR, were degradedd in 6 to 10 days by the addidtion of biofilm collected in early summer, midsumer and autumn. Monas sp. grew remarkably well compared with other organisms in the samples of all seasons. It has been concluded that Monas sp. was indigenous animals in the biological treatment facility and aws able to degrade Microcystis cells and even intracellular microcystin LR, RR and YR in Micro cystin cells.