| 摘要 |
PROBLEM TO BE SOLVED: To improve water quality, soil, and an ecosystem of a water bottom by using snow's cold heat energy. SOLUTION: A snow-melted water tank 34 stores snow-melted water of a snow pile 2 made by accumulating removed snow and the like, and a heat exchanger 35 installed in the water tank cools surface water from a lake and the like, obtained by a surface water intake device 31. The cooled water is discharged to the bottom layer part of the lake and the like through a discharge device 36. A filtration device 33 for filtering suspended solids from the water collected by the surface water intake device 31 and supplying it to the heat exchanger 35 may be installed. A pressure tank storing the collected surface water under a pressure condition may be installed for reducing the activities of algae contained in the collected surface water. Thereby, surface water with a high DO concentration is cooled and returned to the bottom layer to enable purification of bottom water and bottom soil and inhibition of abnormal propagation of algae and water plants without undertaking large scale civil engineering works. The necessity of mowing and removing the algae and water plants is eliminated, which dispenses with waste treatment of them. COPYRIGHT: (C)2007,JPO&INPIT
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