初期降水除去型低コスト雨水利用装置の開発とその効果

概要

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The rain water utilization equipment of the type which removed initial precipitation was developed low-cost in order to store the good rain water. And, the effect of this equipment was evaluated. The results are as follows. 1. The first tank stored the precipitation initial stage 3mm precipitation. And, the secondary tank stored the precipitation after 4mm. In comparison with the water quality of two tanks, component concentration of the secondary tank water variously decreased further than it of the first tank in about 1/3. 2. The water quality of the precipitation collected from the roof greatly receives the effect of roof material. it increased at about 10 times at the Ca2+ concentration. 3. The increase of the Ca2+ concentration is made to increase the pH value by the counteraction. pH of the water collected from the roof of the slate material shows the value in the latter half on the order of pH6 which is almost approximate to the neutrality.