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- W4366200715 abstract "Ammonia (NH3) emissions negatively impact air, soil, and water quality, and thus human health and biodiversity. A large share of emissions, including the largest sources, originate from single or multiple source structures, such as livestock facilities, but also wastewater treatment plants (WWTPs). The inverse dispersion method (IDM) has proven to be effective in measuring total emissions from such structures, however depositional loss between the source and point of measurement is not always accounted for. We applied IDM with a deposition correction to determine total emissions from a representative dairy housing and WWTP during several months in autumn and winter in Switzerland. Total emissions were 1.19 ± 0.48 and 2.27 ± 1.53 kg NH3 d-1 for the dairy housing and WWTP, respectively, which compared well with published emission data for the respective seasons, albeit very few comparable studies exist for WWTPs. A concurrent comparison with an inhouse tracer ratio method at the dairy housing indicated an underestimation of the IDM results by <20%. Diurnal emission patterns were evident at both sites likely driven by changes in air temperature and to a lesser extent wind speed, but possibly also indicating lagged effects of management activities such as sludge tank agitation at the WWTP. Modelled deposition corrections to adjust the concentration loss detected at the measurement point with the associated footprint were 22-28% of the total emissions and the cumulative fraction of deposition to emission modelled with distance from the source was between 7-9% and 9-12% during unstable and stable meteorological conditions, respectively, for the given measurement distances of 60-150 m. Although estimates of depositional loss were plausible, the approach is still connected with substantial uncertainty, which calls for future validation measurements. Longer measurement periods encompassing more management activities and ranges of environmental conditions across all seasons are required to assess the effect of predictor variables on emission dynamics. Combined, IDM with deposition correction will allow the determination of emissions factors at reduced efforts and costs and thereby support the development and assessment of structural and operational emission reducing technologies and enlarge the data availability for emission inventories." @default.
- W4366200715 created "2023-04-19" @default.
- W4366200715 creator A5016612404 @default.
- W4366200715 date "2023-04-19" @default.
- W4366200715 modified "2023-10-16" @default.
- W4366200715 title "Ammonia emissions from a dairy housing and a wastewater treatment plant quantified with an inverse dispersion method accounting for deposition loss" @default.
- W4366200715 doi "https://doi.org/10.31223/x5436z" @default.
- W4366200715 hasPublicationYear "2023" @default.
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