1. Professor, Environmental Engineering Division, Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India (corresponding author).
2. Ph.D. Student, Environmental Engineering Division, Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India.
3. Professor, Dept. of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India.