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Characterization of gas emissions and odors upon composting : study of the correlation between the odor concentration and chemical composition

Abstract : Waste valorization through composting and methanization are actively promoted by the EU policies. However, these waste recycling technologies face a crucial challenge regarding the release and control of odorous and hazardous gas emissions. Indeed, odor pollution is the principal cause for public opposition to waste processing, leading to the closure and lawsuits for waste treatment units. Currently, there is a lack of odor and chemical emissions inventories to support odor and air pollution management plans due to the complexity of odor assessments, generally involving sensory and chemical analysis. Hence, the aim of this PhD thesis was to characterize extensively the gas emissions and odors released during the composting process. To this end, the patterns of odor and pollutant emissions were first traced throughout different operational stage of composting process, namely, storage, active phase, turning and curing. The results showed that the active phase and turning played a pivotal role in odor nuisance generations which were mainly caused by volatile sulfur compounds (VSC). Then, further efforts were focused on characterizing the gas emissions released along the composting active phase of fifteen solid wastes and digestate. The results corroborated the relevance of VSC on odors production during composting and enabled to differentiate the odor impact of gas emissions as a function of the wastes’ feedstock. The last part of this research work was devoted to correlate both, sensory and chemical measurements, through univariate and multivariate regression analysis to ease and strength odor monitoring in waste treatment units. Notably, a partial least squares model improved odor concentration prediction based on the chemical composition of emitted gases.
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Submitted on : Thursday, November 28, 2019 - 4:44:18 PM
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  • HAL Id : tel-02385214, version 1
  • IRSTEA : PUB00061176

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Carlos Andrés Rincon Mejia. Characterization of gas emissions and odors upon composting : study of the correlation between the odor concentration and chemical composition. Other. Université Rennes 1, 2019. English. ⟨NNT : 2019REN1S019⟩. ⟨tel-02385214⟩

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