Abstract
We have carried out the bench-scale experiments and the simulations on Bottom-Filtration for improvement of water quality in eutrophic lakes. “Bottom-Filtration” means filtration of lake water through the filter which is installed on the bottom of the lake, and the filtrate is circulated to the lake water. In the experiment we used decomposed granite and Kuroboku Soil (Ando soil) as the filter media. And circulation rates were set as no circulation, 14 days and 3.5 days. We found that water quality becomes finer as higher the circulation rate, but the filter media do not show much difference. Introducing mass transport by convection to the filter, we remake the Water-Sediments Eutrophication Model, and have carried out the simulation. The results of the experiments and simulations show quite good accordance.
