Abstract
Purpose
Odour is an important aspect of systems for human and agricultural waste management and many technologies are developed with the sole purpose of reducing odour. Compared with greenhouse gas assessment and the assessment of toxicity, odour assessment has received little attention in the life cycle assessment (LCA) community. This article aims to redress this.
Methods
Firstly, a framework for the assessment of odour impacts in LCA was developed considering the classical LCA framework of emissions, midpoint and endpoint indicators. This suggested that an odour footprint midpoint indicator was worth striving for. An approach to calculating an areal indicator we call “odour footprint”, which considers the odour detection threshold, the diffusion rate and the kinetics of degradation of odourants, was implemented in MATLAB. We demonstrated the use of the characterisation factors we calculated in a case study based on odour removal technology applied to a pig barn.
Results and discussion
We produced a list of 33 linear characterisation factors based on hydrogen sulphide equivalents, analogous to the linear carbon dioxide equivalency factors in use in carbon footprinting, or the dichlorobenzene equivalency factors developed for assessment of toxic impacts in LCA. Like the latter, this odour footprint method does not take local populations and exposure pathway analysis into account—its intent is not to assess regulatory compliance or detailed design. The case study showed that despite the need for materials and energy, large factor reductions in odour footprint and eutrophication potential were achieved at the cost of a smaller factor increase in greenhouse emissions.
Conclusions
The odour footprint method is proposed as an improvement on the established midpoint method for odour assessment in LCA. Unlike it, the method presented here considers the persistence of odourants. Over time, we hope to increase the number of characterised odourants, enabling analysts to perform simple site-generic LCA on systems with odourant emissions.
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Acknowledgments
The researchers acknowledge support from the Danish Council for Strategic Research Project 2104-09-0056, the Swedish Foundation for Strategic Environmental Research (MISTRA) Future Fashion project, the Australian Research Council (DP1096691) and Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS) grants 2012–1122 and 2013–1214.
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Peters, G.M., Murphy, K.R., Adamsen, A.P.S. et al. Improving odour assessment in LCA—the odour footprint. Int J Life Cycle Assess 19, 1891–1900 (2014). https://doi.org/10.1007/s11367-014-0782-6
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DOI: https://doi.org/10.1007/s11367-014-0782-6