Research and discussion on the purification technology of roof rainwater for household in islands in China

Roof rainwater, with relatively good water quality, large runoff and convenient collection, has high value of utilization in island. The form of roof rainwater utilization in China is mainly collection and reuse, which is comparatively simple relative to various methods that some countries have, such as roof greening, underground infiltration, collection and reuse and etc. Based on analysis of water quality of roof rainwater, the research and application of roof rainwater utilization at home and abroad was introduced. Meanwhile, for the special location and other characteristics of island in China, more appropriate and effective roof rainwater purification processes, which aimed to those different purposes that roof rainwater could be reused as drinking water and Non-potable water, were proposed to single household and residential area respectively. It was considered by analysis that the effective combination technique of physical method and biological method would be the core of development of roof rainwater purification technology.