[1] Univ Philippines, Natl Grad Sch Engn, Environm Engn Program, Quezon City 1101, Philippines
[2] Univ Salerno, Dept Civil Engn, SEED, I-84084 Fisciano, SA, Italy
[3] Univ Philippines, Dept Chem Engn, Quezon City 1101, Philippines
[4] India Habitat Ctr, Energy & Resources Inst TERI, Darbari Seth Block,Lodi Rd, New Delhi 110003, India