Photo taken on Aug. 11, 2010 shows a truck equipped with large-scale water purifing device in Zhouqu County, Gannan Tibetan Autonomous Prefecture in northwest China's Gansu Province. Large-scale water purifing device began to process water in Zhouqu. The device has a purifing capacity of 300 cubic-meters per day. [Xinhua]

An old man takes purified water in Zhouqu County, Gannan Tibetan Autonomous Prefecture in northwest China's Gansu Province, Aug. 11, 2010. Large-scale water purifing device began to process water in Zhouqu. The device has a purifing capacity of 300 cubic-meters per day. [Xinhua]