1. School of Environment and Civil Engineering; Jiangnan University; Wuxi P. R. China
2. Jiangsu Key Laboratory of Anaerobic Biotechnology; Jiangnan University; Wuxi P. R. China
3. State Environment Protection Key Laboratory of Microorganism Application and Risk Control; Tsinghua University; Beijing P. R. China
4. State Key Laboratory of Urban Water Resource and Environment; Harbin Institute of Technology; Harbin P. R. China