Sediment Treatment in Eutrophicated Lakes with consideration of Seasonal Succession

Abstract

Investigation of optimum sediment treatment in eutrophicated lakes with consideration of seasonal succession using an experimental model ecosystem was conducted. As results, it was made clear that the chl.a suppression rate is influenced by quantity and quality of phytoplankton, especially the dominant species in each season. Furthermore, the existence of cyanophyceae such as Anabaena which can fix N₂ gas in the air, obstructed the chl.a suppression. From the experiment in this study, the optimum treatment method and season were estimated as a hybrid treatment (DAF+CRM) in late summer or autumn.