1. Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
2. Chongqing Academy of Eco-Environmental Science, Chongqing 400700, China
3. Chongqing Institute of Geology and Mineral Resources, Chongqing 400700, China
4. High Tech Inst Beijing, Beijing 100000, China