1. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China
2. Shandong Shuifa Environmental Technology Co., Ltd., Jining 272352, P. R. China
3. Shandong Urban Construction Vocational College, Jinan 250103, P. R. China
4. Center for Ecology and Environmental Protection Education and Communications of Shandong Province, Jinan 250013, P. R. China
5. State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China