Abstract
In order to reduce favorably the growing Microcystis aeruginosa in eutrophicated lakes and marshes with no defective influence to aquatic ecosystem, suppression characteristics of M. aeruginosa in a model pond combined with bioreactor, in which predative microanimals, Monas guttula, Aeolosoma hemprichi and Philodina erythrophthalma were inoculated, was continuously examined. M. aeruginosa in the pond decreased slowly at early 2 days running, after the 4th day the reduction was clearly accerelated under hydraulic retention time of 8 hrs. For quantitative evaluation of the biomass-reduction, the reduction rate of M. aeruginosa in the lake was simulated by that of bioreactor with high densed micro-animals on the carrier. It was found that practical reduction rate of M. aeruginosa was ten-fold higher than theoretical value. As a reason for the significant reduction, it was considered that micro-animals released from the bioreactor combined with the lake might contribute the reduction.
