1. School of Civil Engineering, Chang'an University, Xi'an, China.
2. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China.
3. Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Chang'an University, Xi'an, China.
4. School of Environmental Science and Engineering, Chang'an University, Xi'an, China.