title: Influence of the fetch parameter on results from empirical correlations for estimating odorous emissions at passive liquid surfaces.
abstract: Passive liquid surfaces in wastewater treatment plants may be potential sources of odorous emissions. This study investigates the occurrence and significance of deviations that may originate from the use of the effective diameter as fetch parameter in the empirical correlations utilised by the WATER9 model to estimate odorous emissions at passive liquid surfaces. A sensitivity analysis was performed using benzene as a model compound and considering representative conditions of wind speed and wind alignment. The gas-film mass transfer coefficient (kG) was found relatively in sensitive to the choice of the fetch parameter, deviating less than 15% for aspect rations up to 15. The calculation of the liquid-film mass transfer coefficient (kL) was much more sensitive (positive extreme of 126.98% and negative extreme of -54.80%), partially because of the use of different equations for different fetch-to-depth ratios. For more volatile compounds, such as benzene, these discrepancies will be significantly manifested in the estimated emission rate. When appropriate, the use of the actual fetch instead of the effective diameter is recommended.
authors.affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, NSW 2052, Australia E-mail: r.stuetz@unsw.edu.au.
authors.forename: Ademir A
authors.initials: AA
authors.lastname: Prata
authors.affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, NSW 2052, Australia E-mail: r.stuetz@unsw.edu.au; Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, 88040-900 Florianópolis, SC, Brazil.
authors.forename: Milena J
authors.initials: MJ
authors.lastname: Calvo
authors.affiliation: Former Principal Engineer, Wastewater Services, NSW Public Works, Sydney, NSW, Australia.
authors.forename: Gaetano
authors.initials: G
authors.lastname: Boncardo
authors.affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, NSW 2052, Australia E-mail: r.stuetz@unsw.edu.au.
authors.forename: Eric C
authors.initials: EC
authors.lastname: Sivret
authors.affiliation: Departamento de Engenharia Ambiental, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, 29.060-970 Vitória, ES, Brazil.
authors.forename: Jane M
authors.initials: JM
authors.lastname: Santos
authors.affiliation: School of Mechanical and Manufacturing Engineering, UNSW, Sydney, NSW 2052, Australia.
authors.forename: Victoria
authors.initials: V
authors.lastname: Timchenko
authors.affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, NSW 2052, Australia E-mail: r.stuetz@unsw.edu.au.
authors.forename: Richard M
authors.initials: RM
authors.lastname: Stuetz
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001554:Benzene / Q000032:analysis*; D008962:Models, Theoretical; D009812:Odorants / Q000032:analysis*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014919:Wind
chemical_list: D000393:Air Pollutants; D014874:Water Pollutants, Chemical; D001554:Benzene