1. College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, PR China
2. Shaanxi Province Institute of Resources and Electric Power Investigation and Design, Xi'an 710613, PR China
3. PowerChina Northwest Engineering Corporation Limited, Xi'an 710065, PR China
4. Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia
5. Institute for Sustainable Industries and Liveable Cities, Victoria University, PO Box 14428, Melbourne, Victoria 8001, Australia