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Acknowledgments
The authors would like to thank Dr Geir Orderud for helpful comments. We also thank Prof. Robert Mortimer of Nottingham Trent University, UK, for improving the English.
Additional information
Funding
This work was supported by the SinoTropia Project [Project No. 209687/E40], Environmental Sustainability Programme [Contract No. DCI-ASIE/2013/323-550, EuropeAid/133-582/L/ACT/CN], US EPA [Assistance no. X4-83338601, X4-83350501] and Major Science and Technology Program for Water Pollution Control and Treatment of China [2015ZX07203-011].