Photo taken on July 25, 2015 shows a view of the wastewater treatment plant in Sansha City, on Yongxing, one of the Xisha islands in south China's Hainan Province. An environmental treatment system on Yongxing Island on Saturday was put into operation, including a wastewater treatment plant, a garbage treatment project and a desalination plant project which is under construction. (Xinhua/Guo Cheng)
