1. School of Civil Engineering, Lanzhou Univ. of Technology, 287, Rd. Langongping, Lanzhou 730050, China; Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Graduate School at Shenzhen, Tsinghua Univ., Shenzhen 518055, China.
2. School of Resources and Environmental Engineering, Jiangxi Univ. of Science and Technology, No. 86, Hongqi Ave., Ganzhou, Jiangxi 341300, China (corresponding author).
3. School of Energy and Environment, City Univ. of Hong Kong, Tat Chee Ave., Kowloon, Hong Kong 999077, China.
4. Research Center for Water Environment Technology, School of Engineering, Univ. of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.