Abstract
In this study, a method of using high-dissolved-oxygen water to purify bottom sediment in a closed water body was confirmed to be effective. A high-rate, high-efficiency oxygen dissolver was developed and a method of producing high-dissolved-oxygen water was discussed. In addition, the prevention of phosphorus release from the bottom sediment using high-dissolved-oxygen water was also studied. A pilot-scale oxygen dissolver was developed and an on-site study was carried out at two dam reservoirs in Yamaguchi, Japan. As results, it was possible to spread the high-dissolved-oxygen water across the bottom layer without any diffusion in the upper direction. Furthermore, the presence of high-dissolved-oxygen water could prevent the release of phosphorus from the bottom sediment. This study revealed the effectiveness of high-dissolved-oxygen water for the improvement in the water quality of a closed water body.
