1. Henan University of Technology, College of Environmental Engineering Zhengzhou P.R. China
2. Zhengzhou Key Laboratory of Organic Waste Resource Utilization Zhengzhou P.R. China
3. Chongqing University, State Key Laboratory of Coal Mine Disaster Dynamics and Control Shazheng Street 174 400044 Chongqing P.R. China
4. Yibin University, College of Resources and Environmental Engineering Yibin P.R. China