This study focuses on the assessment of volatile organic compounds (VOCs) and odor compounds emissions from a post-closure landfill. A human health risk assessment and an air quality evaluation were performed to compare two different landfill gas management scenarios and to assess whether a methane oxidizing biofilter mitigates the risk from inhalation exposure to VOCs and odor emissions. Three specific monitoring campaigns were performed: one sample of raw biogas at the biofilter inlet and three air samples from the biofilter surface were collected and analyzed to determine the concentration levels of VOCs, H2S and odor compounds accordingly to US EPA, 1995 and US EPA TO-15, 1999, NIOSH 6013:1994, and dynamic olfactometry (EN 13725:2003), respectively. Concerning the raw biogas, five odor compounds were selected from the mixture and then the odor activity value (OAV) was evaluated. CALPUFF dispersion model was used to evaluate the VOCs concentration in air at eleven sensitive receptors. In the risk assessment, cyclohexane, n-hexane, 2-methylpentane, 3-methylpentane, benzene, xylenes, toluene, dichlorodifluoromethane, vinyl chloride were selected to evaluate the hazard index (HI) for non-carcinogenic compounds and the cancer risk (R) for carcinogenic compounds (benzene). The results showed that for both LFG management scenarios HI and R resulted negligible (HI≤1 and R<10-6) and the odor concentration resulted always below 1 UO m-3 at each sensitive receptor. Furthermore, emerged that the biofilter reduce HI and R on average by 93% and 17%.

Risk assessment of a methane oxidizing biofilter for reducing landfill gas emissions from a post-closure landfill

Rossi E.;Pecorini I.;Iannelli R.
2019-01-01

Abstract

This study focuses on the assessment of volatile organic compounds (VOCs) and odor compounds emissions from a post-closure landfill. A human health risk assessment and an air quality evaluation were performed to compare two different landfill gas management scenarios and to assess whether a methane oxidizing biofilter mitigates the risk from inhalation exposure to VOCs and odor emissions. Three specific monitoring campaigns were performed: one sample of raw biogas at the biofilter inlet and three air samples from the biofilter surface were collected and analyzed to determine the concentration levels of VOCs, H2S and odor compounds accordingly to US EPA, 1995 and US EPA TO-15, 1999, NIOSH 6013:1994, and dynamic olfactometry (EN 13725:2003), respectively. Concerning the raw biogas, five odor compounds were selected from the mixture and then the odor activity value (OAV) was evaluated. CALPUFF dispersion model was used to evaluate the VOCs concentration in air at eleven sensitive receptors. In the risk assessment, cyclohexane, n-hexane, 2-methylpentane, 3-methylpentane, benzene, xylenes, toluene, dichlorodifluoromethane, vinyl chloride were selected to evaluate the hazard index (HI) for non-carcinogenic compounds and the cancer risk (R) for carcinogenic compounds (benzene). The results showed that for both LFG management scenarios HI and R resulted negligible (HI≤1 and R<10-6) and the odor concentration resulted always below 1 UO m-3 at each sensitive receptor. Furthermore, emerged that the biofilter reduce HI and R on average by 93% and 17%.
2019
Rossi, E.; Pecorini, I.; Iannelli, R.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1034452
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