1. Department of Environmental Engineering, College of Engineering, Imam Abdulrahman Bin Faisal University, P.O Box 1982, Dammam, Saudi Arabia
2. Department of Environmental Engineering Sciences, University of Florida, PO Box 116450 Gainesville, Florida 32611-6450, United States
3. Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
4. National Risk Management Research Laboratory, U.S. Environmental Protection Agency, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268, United States