Wenshan Guo, Ph D, is Professor and a core member in the Centre for Technology in Water and Wastewater at the University of Technology Sydney. Huu Hao Ngo, Ph D, is Professor of Environmental Engineering and serving as Deputy Director of the Centre for Technology in Water and Wastewater at the University of Technology Sydney. Rao Y. Surampalli, Ph D, is President and Chief Executive Officer of the Global Institute for Energy, Environment, and Sustainability. Tian C. Zhang, Ph D, is Professor in the Department of Civil Engineering at the University of Nebraska-Lincoln in the United States.