| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve the water quality conservation by supplying high-concentration or saturated oxygen-containing water to a restricted water area to increase the dissolved oxygen concentration and to improve the area to an aerobic environment, since in the bottom layer water of a dam lake, a lake, a marsh, a closed sea area, or the like, the dissolved oxygen concentration of the restricted water area reaches zero or almost an anaerobic state mainly in summer to deteriorate the water quality. <P>SOLUTION: A layer of discontinuity is developed in the middle water layer or lower of the dam lake, the lake, the marsh, the closed sea area, or the like in the seasons except a specific season due to a temperature difference or a density difference of the salt content, dissolved metals, or the like and consequently the water is hardly mixed vertically. A gas-liquid dissolution apparatus (underwater type), in which a suction port, a discharge port, an underwater pump and a gas-liquid dissolution part are integrated with one another, is arranged in the objective water area. The oxygen dissolved in the predetermined water layer of the objective water area is increased and the water quality of all of oxygen-poor water areas is improved by successively vertically moving the gas-liquid dissolution apparatus or an oxygen spout. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
