A laboratory technician does the tests during the procedure of transforming used cooking oil into biofuel at Guanniu Biotech Company in Shangrao county, east China's Jiangxi province, Sept. 29, 2015. The company obtained its patent for the technology for recycling the used cooking oil, called "gutter oil" in Chinese, as biofuel and about 100 tons of biofuel is produced from 120 tons of waste cooking oil per day currently. (Xinhua/Wan Xiang)
