A study on the water purification in closed water area including bottom sludge and the revival of water environment for water student creature

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The water purification in natural waters including the bottom sludge and the revival of the water environment for the water student creature by using the micro-bubble technology ware investigated. The main results are as follows.First, air micro-bubbles and pure oxygen micro-bubbles were supplied to the lower layer made oxygen-less waters in the comparatively shallow dam lake, and the water quality was improved. A change in the water quality due to the diffusion of the micro-bubble was observed around the device establishment point in the range of about an up-down flow way 100 m.Second, micro-bubble technology was applied to scallop culture at Hunka Bay in Hokkaido, and shortening of the culture period, the improvement of the culture working environment and the taste were realized. And the effect on scallop blood flow promotion by the micro-bubble was made clear.Third, micro-bubble technology was applied to the pearl culture in Ago Bay, and the growth promotion of pearl shells and prevention of the death of the shells were realized.On the base of these results, the physical and chemical characteristics of micro-nano bubbles were investigated and the physiological activity of two sheet shells to provide the bubbles was found.