Development of an aquatic environment restoration system for closed water areas, whose underwater light environment is reduced in quality due to water contamination

开发了利用LED光照射激活藻类光合作用的水环境改善技术，目的是直接为因有机污染而导致缺氧或缺氧的水环境恶化的封闭水域的环境恢复做出贡献。 这涉及在实验水槽中使用水下LED灯的照射实验，目的是了解藻类对蓝色波长和红色波长的混合波长光的光合作用活化特性。因此，为了在短期内表现出对DO环境的改善效果，必须以约1/4的R/B比进行照射，然后将R/B比增加到约2，以抑制浮游植物的增殖并避免LED照射引起的富营养化。

The development of water environment improvement technology using the activation of algae photosynthesis via LED light irradiation was conducted, with the aim of directly contributing to the environmental restoration in closed water areas affected by deteriorating water environment with oxygen deficiency or anoxiation due to organic contamination. This involved an irradiation experiment using underwater LED lights in an experimental water tank, with the aim of understanding the photosynthesis activation characteristics of algae with respect to the mixed wavelength lights of blue wavelength and red wavelength. As a result, to exhibit improvement effects for a DO environment in the short term, irradiation must be performed with an R/B ratio of approximately 1/4, which is then increased to approximately 2 to inhibit the proliferation of phytoplankton and avoid eutrophication by LED irradiation.