1. a Department of Environmental Engineering and Sanitation , Fooyin University , Kaohsiung , Taiwan , Republic of China
2. b Department of Civil and Environmental Engineering , University of Central Florida , Orlando , FL , USA
3. c Llano Grande Center for Research and Development , Edcouch , TX , USA
4. d Department of Chemical Engineering , National Kaohsiung University of Applied Sciences , Kaohsiung , Taiwan , Republic of China