Abstract: According to the designing idea of integration system,a river-lake waterbody purification system powered by green energy(solar and wind energy) was developed.The system is composed of three sub-systems,i.e.solar and wind power generator system,aerobic biological contact oxidation system and phyto-biological system.The tests of water quality after the system operated continuously for over 7 months demonstrate that the system performed quite well,in oxygenating the waterbody and improving its water quality.The content of dissolved oxygen in aerated zone was maintained in the range of 6.5-11.2 mg·L^-1.The water after treatment in the purification system was uplifted by one grade in quality.

Key words: water purification system, wind and solar energy, aeration, biological contact oxidation, solar energy, wind energy, slightly-polluted water