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VOCs emission from a final landfill cover system induced by ground surface air temperature and barometric pressure fluctuation

Wang, Qiao, Xie, Haijian, Peng, Yingfei, Mohammad, Arif ORCID: and Singh, Devendra Narain 2023. VOCs emission from a final landfill cover system induced by ground surface air temperature and barometric pressure fluctuation. Environmental Pollution 336 , 122391. 10.1016/j.envpol.2023.122391
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Volatile organic compounds (VOCs) emission flux and their concentration profiles were measured at a final municipal solid waste (MSW) landfill cover in Hangzhou, China. The influencing parameters, especially ground surface air temperature and pressure were monitored concomitantly. Furthermore, a numerical model incorporating coupled thermo-hydro-chemical interaction to assess VOCs emission from this final landfill cover (LFC) system was developed and validated with the field test results. The tested total VOC emission flux from the final cover is 0.0124 μg/m2/s, which indicates that the total amount of VOCs emitted into the atmosphere is 391 mg/m2 annually. Among these, dichloromethane (DCM) dominated VOCs emission flux during May, comprising 51.8% of the total emission flux. The numerical simulation results indicated that the diffusive emission flux of VOCs varied consistently with the fluctuation of atmospheric temperature. Whereas, the advective flux varied inversely with the fluctuation of barometric pressure. The highest difference in diffusive emission flux induced by temperature variation is 183 μg/m2/day and occurred in spring. Moreover, the results demonstrated that the impact of atmospheric temperature and pressure fluctuation on the emission of VOC from final covers is non-negligible when reasonably assessing the risks of landfill and landfill gas emission budget.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0269-7491
Date of First Compliant Deposit: 27 November 2023
Date of Acceptance: 12 August 2023
Last Modified: 27 Nov 2023 20:03

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