Attenuation of hydrogen sulfide at construction and demolition debris landfills using alternative cover materials |
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| Authors: | Qiyong Xu Timothy Townsend Debra Reinhart |
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| Affiliation: | 1. Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL 32611-6450, United States;2. Civil and Environmental Engineering Department, University of Central Florida, Orlando, FL 32826, United States;1. Key Laboratory for Urban Habitat Environmental Science and Technology, Peking University Shenzhen Graduate School, Shenzhen 518055, China;2. Dept. of Environmental Engineering Sciences, University of Florida, Gainesville, FL 32611-6450, United States;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Civil Engineering, Lamar University, Beaumont, TX 77710, USA;4. College of Environment and Energy, South China University of Technology, Guangzhou 510006, China;1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;1. Dipartimento di Scienze della Terra, University of Florence, Via G. La Pira 4, 50121 Florence, Italy;2. CNR – Istituto di Geoscienze e Georisorse, Via G. La Pira 4, 50121 Florence, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via Ugo La Malfa 153, 90123 Palermo, Italy;4. Dipartimento di Scienze della Terra e del Mare, University of Palermo, Via Archirafi 36, 90123 Palermo, Italy;1. Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada;2. Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada;1. Department of Environmental Engineering, Hangzhou Normal University, Hangzhou 310016, PR China;2. Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, Hangzhou Normal University, Hangzhou 310016, PR China;3. Department of Biological & Agricultural Engineering, University of Arkansas, AR 72701, USA;4. Hubei Academy of Environmental Sciences, Wuhan 430070, PR China |
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| Abstract: | The attenuation of H2S emissions by various landfill cover materials was evaluated using both laboratory and field experiments. The results demonstrated that cover materials consisting of selected waste products (compost and yard trash) and soils amended with quicklime and calcium carbonate effectively attenuated H2S emissions and detectable H2S emissions were only encountered in a testing plot using a sandy soil cover (average emission rate was 4.67 × 10?6 mg m?2 s?1). H2S concentration profiles in the cover materials indicated that H2S was removed as it migrated through the cover materials. At the same depth in the testing area, the H2S concentration in the sandy soil field plot was always higher than that of other testing plots because the sand (a) demonstrated less ability to remove H2S and (b) exhibited a higher H2S concentration at the base of the cover. Laboratory experiments confirmed these observations, with a combination of physical adsorption, chemical reactions, and biological oxidation, accounting for the enhanced removal. In addition to removal, the results suggest that some of the cover materials reduced H2S generation by creating less favorable conditions for sulfate-reducing bacteria (e.g., high pH and temperature). |
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