title: Molecular weight distribution of organic matter by ozonation and biofiltration.
abstract: Molecular weight (MW) distribution of organic matter by ozonation and biofiltration was evaluated using gel chromatography. The MW distribution of organic matter by Sephadex G-25 was observed from groups 2 (MW = 1,029-7,031 g/mol) and 3 (MW = 303-1,029 g/mol) shifted to groups 2, 3 and 4 (MW < 303 g/mol) under ozone doses of 0.1 and 0.4 mg O₃/mg total organic carbon (TOC). The shift in MW increases as ozone dosage increases. Biofiltration effectively degraded the organic molecule of group 2; however, the biofiltration only slightly degraded the organic molecule of group 4. Increased ozone dose destroyed functional groups C═C in phenolic and C-O in alcoholic compounds and increased UV-insensitive biodegradable organic carbon for subsequent biofiltration. Biofiltration effectively degraded organic compounds of alcohols and alkenes at an ozone dose of 0.1 mg O₃/mg TOC. Experimental approaches in this study can be applied to evaluate and diagnose the function of a full-scale process combining ozonation and biofiltration in drinking water treatment plants.
authors.affiliation: Department of Safety, Health and Environmental Engineering, Central Taiwan University of Science and Technology, Chinese, Taiwan. yhlin1@ctust.edu.tw
authors.forename: Yen-Hui
authors.initials: YH
authors.lastname: Lin
mesh_terms: D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis; D003911:Dextrans / Q000737:chemistry; D005374:Filtration / Q000379:methods*; D006812:Humic Substances / Q000032:analysis; D008970:Molecular Weight; D009930:Organic Chemicals / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003911:Dextrans; D006812:Humic Substances; D009930:Organic Chemicals; D010126:Ozone; D002244:Carbon; C025614:sephadex