大城市实施分质供水的必要性和可行性--以天津市为例

随着社会和经济的迅速发展，淡水资源供需矛盾日益突出。当前除须继续加大治污、水环境保护的力度以外，还应从资源水利和环境水利的角度出发，实行分质用水，优水优用，污水巧用，差水改用，加速构筑多层次、多系统的立体供水网络。分质供水已有2000年的历史，现代社会已有成熟技术和实践经验，社会对分质供水亦有需求，故而分质供水是“资源型”缺水城市解决水资源短缺的必由之路。

The Necessity and Feasibility of the Water Supply by Different Quality in Large Cities--Taking Tianjin City as an Example

With the cities development, water has been an important factor to puzzle the sustainable development of economy, especially in Tianjin. It is a big systematic project to meet the demand of the water shortage. To resolve the problem, Water Transfer Project From South to North China is the best way. However, saving-on-water is not a unique way. A number of new measures should be considered including (1) Controlling the water resource pollution; (2)Using water reasonably; (3) Reforming the existing water supply pattern; Furthermore, the most important way is supply water with different levels on quality according to assorted demands. In a short word, "water supply with different quality" should come into our schedule.