title: Odor Events in Surface and Treated Water: The Case of 1,3-Dioxane Related Compounds.
abstract: A study has been carried out to identify the origin of the odorous compounds at trace levels detected in surface waters and in Barcelona's tap water (NE Spain) which caused consumer complaints. The malodorous compounds were 2,5,5-trimethyl-1,3-dioxane (TMD) and 2-ethyl-5,5-dimethyl-1,3-dioxane (2EDD) which impart a distinctive sickening or olive-oil odor to drinking water at low ng/L levels. Flavor proﬁle analysis (FPA) or threshold odor number (TON) were used for organoleptic purposes. Levels up to 749 ng/L for TMD and 658 ng/L for 2EDD were measured at the entrance of the drinking water treatment plant. Three wastewater treatment plants (WWTPs) using industrial byproducts coming from resin manufacturing plants to promote codigestion were found to be the origin of the event. Corrective measures were applied, including the prohibition to use these byproducts for codigestion in the WWTPs involved. A similar event was already recorded in the same area 20 years ago.
authors.affiliation: Aigües de Barcelona , Empresa Metropolitana de Gestió del Cicle Integral de l'Aigua, S.A. General Batet, 1-7, 08028 Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Quintana
authors.affiliation: Aigües de Barcelona , Empresa Metropolitana de Gestió del Cicle Integral de l'Aigua, S.A. General Batet, 1-7, 08028 Barcelona, Spain.
authors.forename: Lídia
authors.initials: L
authors.lastname: Vegué
authors.affiliation: Aigües de Barcelona , Empresa Metropolitana de Gestió del Cicle Integral de l'Aigua, S.A. General Batet, 1-7, 08028 Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Martín-Alonso
authors.affiliation: Aigües de Barcelona , Empresa Metropolitana de Gestió del Cicle Integral de l'Aigua, S.A. General Batet, 1-7, 08028 Barcelona, Spain.
authors.forename: Miquel
authors.initials: M
authors.lastname: Paraira
authors.affiliation: Aigües de Barcelona , Empresa Metropolitana de Gestió del Cicle Integral de l'Aigua, S.A. General Batet, 1-7, 08028 Barcelona, Spain.
authors.forename: M Rosa
authors.initials: MR
authors.lastname: Boleda
authors.affiliation: Institute of Environmental Assessment and Water Research-Spanish Council for Scientific Research (IDAEA-CSIC) , Department of Environmental Chemistry, Jordi Girona 18, 08034 Barcelona, Spain.
authors.forename: Francesc
authors.initials: F
authors.lastname: Ventura
mesh_terms: D004146:Dioxanes / Q000032:analysis*; D060766:Drinking Water / Q000032:analysis; D009812:Odorants / Q000032:analysis*; D045483:Rivers / Q000737:chemistry; D013030:Spain; D013050:Spectrometry, Fluorescence; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification
chemical_list: D004146:Dioxanes; D060766:Drinking Water; D062065:Wastewater; D014874:Water Pollutants, Chemical; C101210:2-ethyl-5,5-dimethyl-1,3-dioxane; C025223:1,4-dioxane