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

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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.