DOI: 10.1016/j.atmosenv.2018.02.029
Scopus记录号: 2-s2.0-85042389146
论文题名: Mass transfer inside a flux hood for the sampling of gaseous emissions from liquid surfaces – Experimental assessment and emission rate rescaling
作者: Prata A ; A ; , Jr ; , Lucernoni F ; , Santos J ; M ; , Capelli L ; , Sironi S ; , Le-Minh N ; , Stuetz R ; M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 179 起始页码: 227
结束页码: 238
语种: 英语
英文关键词: Area sources
; Dynamic flux chamber
; Mass transfer coefficients
; Odour emission
Scopus关键词: Acetic acid
; Air
; Evaporation
; Gases
; Liquids
; Organic acids
; Particulate emissions
; pH
; Volatile organic compounds
; Wastewater treatment
; Wind
; Wind tunnels
; Area sources
; Atmospheric emission
; Direct measurement
; Dynamic flux chamber
; Experimental assessment
; Microenvironments
; Odour emissions
; Wastewater treatment plants
; Mass transfer
; acetic acid
; volatile organic compound
; airflow
; concentration (composition)
; emission
; evaporation
; experimental study
; flux chamber
; gas phase reaction
; liquid
; mass transfer
; model
; odor
; sampling
; volatile organic compound
; volatilization
; wastewater treatment plant
; Article
; atmospheric transport
; concentration (parameters)
; evaporation
; gas
; liquid
; model
; phase transition
; priority journal
; surface property
; waste water management
; wind
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This study assesses the mass transfer of compounds inside the US EPA flux hood, one of the enclosure devices most commonly employed for the direct measurement of atmospheric emissions from liquid surfaces in wastewater treatment plants (WWTPs). Experiments comprised the evaporation of water and the volatilisation of a range of volatile organic compounds (VOCs). Special attention was given to the evaluation of the mass transfer coefficients in the microenvironment created by the flux hood and the effects of concentration build up in the hood's headspace. The VOCs emission rates and the water evaporation rates generally increased with the sweep air flow rate, as did the mass transfer coefficients for all compounds. The emission of compounds whose volatilisation is significantly influenced by the gas phase was greatly affected by concentration build up, whereas this effect was not significant for liquid phase-controlled compounds. The gas-film mass transfer coefficient (kG) estimated inside the US EPA flux hood was of the same order as the respective kG reported in the literature for wind tunnel-type devices, but the emission rates measured by the flux hood can be expected to be lower, due to the concentration build-up. Compared against an emission model for the passive surfaces in WWTPs, the mass transfer of acetic acid (representing a gas phase-dominated compound) inside the US EPA flux hood was equivalent to conditions of wind speeds at 10 m height (U10) of 0.27, 0.51 and 0.99 m s−1, respectively, for sweep air flow rates of 2, 5 and 10 L min−1. On the other hand, for higher wind speeds, the emission rates of gas phase-controlled compounds obtained with the flux hood can be considerably underestimated: for instance, at U10 = 5 m s−1, the emission rates of acetic acid inside the flux hood would be approximately 23, 12 and 6 times lower than the emission rates in the field, for sweep air flow rates of 2, 5 and 10 L min−1, respectively. A procedure is presented in order to scale the emission rates of these compounds measured with the flux hood to field conditions of higher winds. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82955
Appears in Collections: 气候变化事实与影响
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作者单位: UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia; Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Piazza L. da Vinci 32, Milano, Italy; Departamento de Engenharia Ambiental, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vitória, ES, Brazil
Recommended Citation:
Prata A,A,, Jr,et al. Mass transfer inside a flux hood for the sampling of gaseous emissions from liquid surfaces – Experimental assessment and emission rate rescaling[J]. Atmospheric Environment,2018-01-01,179