Dr. Muhammad Zaffar Hashmi is Assistant Professor of Environmental Engineering in the Department of Chemistry, COMSATS University, Pakistan. He received his Ph.D. in Environmental Chemistry and Toxicology from Zhejiang University, China. Dr. Hashmi’s research interests are analytical chemistry and the development of treatment technologies to control environmental and industrial pollution. He also has expertise in developing environmentally sustainable and feasible technologies including bioremediation, using innovative microbes and genes, plants, and microcosms. He has edited seven books, 14 book chapters, 80 original research articles and is currently series editor of two environmental contaminant book series. Dr. Hashmi is also an Associate Editor of the Arabian Journal of Geosciences. Dr. Hashmi is Member of the Pakistan Academy of Sciences, International Toxicology Society, HEC and PSF Research Grants Committee, and has been awarded a KANS Prize in OIC countries by MUSTAFA Science and Technology Foundation. Shuhong Wang works in the School of Resource and Civil Engineering at Northeastern University, Shenyang, China. Zulkfil Ahmed works in the School of Resource and Civil Engineering at Northeastern University, Shenyang, China.