^1.Shaanxi Provincial Key Laboratory of Environmental Engineering, Shaanxi Provincial Sewage Treatment and Resourcefulness Engineering and Technology Research Center, National International Science and Technology Cooperation Base for the Development and Utilisation of Non-traditional Water Resources in Cities, Key Laboratory of Northwest Water Resources and Environmental Ecology of Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

^2.Andean College, Xi'an 710055, China

^3.Department of Civil and Environmental Engineering, Tohoku University, Sendai 9809579, Japan