| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an apparatus for storing rainwater which can keep or improve the quality of water in a water storage tank for storing rainwater. SOLUTION: A circulating device 4 for circulating stored water W2 in a water storage tank 1, a useful bacteria propagation means 10 for facilitating the propagation of useful bacteria which decompose organic substances, etc., in the stored water W2, an aeration means 11, etc., are arranged in the water storage tank 1. By keeping or improving the quality of rainwater stored in the tank 1 as the stored water W2, the stored water W2 is used as good reclaimed water. In this system, at least part of necessary power can be supplied from a natural power generation unit implementing solar thermal electric conversion, wind power generation, etc.</p> |
