environmental protection isbasic (national) policies of our country.the globalization of the world economy has shown that to realize sustainabledevelopment of economy,we have to resolve thecontradiction between development and environmentalprotection.With the high-speed development of our economy andsociety.Public nuisances in the city especially the question of water pollution is gradually serious.The town lives the esmissions of sewage to year by year raise.Currently ourwater pollution control of point already from regard industrial point source as principle, gradually transform into regard dirty water pollution in the city as principle of control.Therefore the tapping is suitable our country state of the nation, efficiently, consume low, can satisfy emissions to request, the radicle set up and running expense low wastewater treatment new technique and new craft, have full important realistic meaning谢谢，是你自己翻译的吧上半节是，下半部分不是。。看得眼花了