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Potential odour emission measurement in organic fraction of municipal solid waste during anaerobic digestion: Relationship with process and biological stability parameters

Orzi, V., Cadena, E., D'Imporzano, G., Artola, A., Davoli, E., Crivelli, M., Adani, F.
Bioresource technology 2010 v.101 no.19 pp. 7330-7337
anaerobic digestion, electronic nose, gas chromatography, mass spectrometry, microbial activity, municipal solid waste, odor emissions, odors, olfactometry, processing stages, volatile organic compounds
The aim of the present study is to investigate the correlation between microbial activity, i.e., biological stability measured by aerobic (OD₂₀ test) and anaerobic tests (ABP test), and odour emissions of organic fraction of municipal solid waste during anaerobic digestion in a full-scale treatment plant considering the three stages of the process (input, digested and post-digested waste). The results obtained indicated that the stabilization of the treated material reduces the odour impact measured by the olfactometric approach. Successive application of gas chromatography mass spectrometry (GC-MS) and electronic nose (EN) allowed the characterization of the different groups of volatile organic compounds (VOCs) responsible of odour impacts determining, also, their concentration. Principal component and partial least squares analyses applied to the EN and GC-MS data sets gave good regression for the OD₂₀ vs the EN and OD₂₀ vs the GC-MS data. Therefore, OD₂₀ reduction could be used as an odour depletion indicator.