tract: by using this gas-float way plus membrane disposal technique to dispose the standardly discharged daily sewage and industrial waste water. This technique have a good effect on the organic contaminant, resolvable solid, chroma and metal ion and so on. With a lower index compared with the running water, the target water can be completely reused in everyday life and production. The quality of the coming water is stable. Fewer costs are needed. Furthermore, this facility does not take up too much room..