Water Purification in Irrigation Tanks by Enhancing Photosynthesis of Phytoplankton by Artificial Irradiation

概要

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Water is most dense at 4℃ and becomes less dense at both higher and lower temperatures. Because of the density-temperature relationship, many reservoirs in temperate climates tend to stratify. The water warmed by the sun will remain at the surface (epilimnion), while the dense and cold water sinks to the bottom (hypolimnion). The layer separating the two layers is the thermocline. These layers do not mix, and the hypolimnion is cut off from atmospheric oxygen and suffers from environmental degradation such as eutrophication. Organic sludge is removed by dredging and self-purification of reservoir is produced by supplying oxygen to a hypolimnion by aeration to improve this environmental degradation. In this paper, we suggest new water purification system without aeration or dredging. The system promotes photosynthesis of phytoplankton at a disphotic and hypoxic bottom layer by irradiating artificial light directly. Our concern is to inspect that this system can supply oxygen with phytoplankton living in a hypoxic hypolimnion.
日本雨水資源化システム学会の論文