雨水要回收利用的工艺（A process in which rainwater is recycled）.docVIP

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2017-08-02 发布于河南
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雨水要回收利用的工艺（A process in which rainwater is recycled）.doc

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雨水要回收利用的工艺（A process in which rainwater is recycled） 1 roof rainwater treatment process Roof rainwater collection and utilization system is mainly used in families, public places and enterprises and institutions of non potable water, such as irrigation, toilet flushing, laundry, car washing, cooling, recycling and other water system. Reference roof rainwater runoff natural sedimentation and coagulation test results, when the natural precipitation time is more than 90 min, the removal rate of COD reached more than 30% coagulation of COD and the removal rate of SS was significantly higher than that of natural precipitation. But the coagulation process increases the dosing equipment, high cost, if there is enough time. The natural precipitation method is a simple and effective. 2, road, courtyard, rainwater treatment process Road rainwater water pollution, water quality is complex, should be removed before initial runoff, followed by coagulation, sedimentation, filtration and oil removal treatment process, when necessary to increase biological activated carbon process, and then reuse or recharge. On the road and courtyard runoff usually has many large particles of debris and oil, remove the runoff in the leaves, paper, waste plastics and other large debris particles using grating filter, if the gate is blocked, the overflow device will overflow to the sedimentation tank. For the oil in the rain, use the elbow method to intercept. For example, the elbow is installed on the pipe where the rainwater enters the filter tank through the sedimentation tank, so that the normal water level is on the inlet of the elbow. The oil floating on the water is intercepted in the sedimentation tank. Because of the high level of pollution, the difficulty and cost of the traffic lane runoff are very large. Therefore, it is not recommended to deal with and reuse it. It can be directly discharged into the municipal pipeline and into the sewage treatment plant. 3 routine rain water treatment