About the Authors

Ling Tong

Affiliations School of Environmental Science and Engineering, Tianjin University, Tianjin, China, Key Laboratory of Pollution Process and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin, China

Kai Li

Affiliation Department of Industrial Engineering, Nankai University, Tianjin, China

Qixing Zhou

zhouqx@nankai.edu.cn

Affiliation Key Laboratory of Pollution Process and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed the experiments: LT. Analyzed the data: KL LT QZ. Wrote the paper: LT QZ KL.