title: Effects of ozonation pretreatment on natural organic matter and wastewater derived organic matter - Possible implications on the formation of ozonation by-products.
abstract: The aim of this study was to investigate possible implications of natural and wastewater derived organic matter in river water that is subsequently used following treatment for drinking purposes. River water was subjected to lab-scale ozonation experiments under different ozone doses (0.1, 0.4, 0.8, 1.0 and 2.0 mgO3/mgC) and contact times (1, 3, 5, 8 and 10 min). Mixtures of river water with humic acids or wastewaters (sewage wastewater and secondary effluents) at different proportions were also ozonated. Dissolved organic carbon and biodegradable dissolved organic carbon concentrations as well as spectroscopic characteristics (UV absorbance and fluorescence intensities) of different types of dissolved organic matter and possible changes due to the ozonation treatment are presented. River water, humic substances and wastewater exhibited distinct spectroscopic characteristics that could serve for pollution source tracing. Wastewater impacted surface water results in higher formation of carbonyl compounds. However, the formation yield (μg/mgC) of wastewaters was lower than that of surface water possibly due to different composition of wastewater derived organic matter and the presence of scavengers, which may limit the oxidative efficiency of ozone.
authors.affiliation: Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54 124 Thessaloniki, Greece. Electronic address: alexpapageorgiou@hotmail.com.
authors.forename: Alexandros
authors.initials: A
authors.lastname: Papageorgiou
authors.affiliation: Division of Chemical Technology, Department of Chemistry, Aristotle University, 54 124 Thessaloniki, Greece.
authors.forename: Stylianos K
authors.initials: SK
authors.lastname: Stylianou
authors.affiliation: Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54 124 Thessaloniki, Greece.
authors.forename: Pavlos
authors.initials: P
authors.lastname: Kaffes
authors.affiliation: Division of Chemical Technology, Department of Chemistry, Aristotle University, 54 124 Thessaloniki, Greece.
authors.forename: Anastasios I
authors.initials: AI
authors.lastname: Zouboulis
authors.affiliation: Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54 124 Thessaloniki, Greece.
authors.forename: Dimitra
authors.initials: D
authors.lastname: Voutsa
mesh_terms: D002244:Carbon / Q000737:chemistry; D005618:Fresh Water / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D009930:Organic Chemicals / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D045483:Rivers; D013056:Spectrophotometry, Ultraviolet; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods
chemical_list: D002244:Carbon; D006812:Humic Substances; D009930:Organic Chemicals; D010126:Ozone; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Aldehydes; BDOC; EfOM; Fluorescence; NOM; Ozonation