Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas
Isotopic compositions of CH4 and CO2 surface and subsurface gases and groundwater from an urban solid waste disposal site from Gualeguaychú city (Argentina) were measured to detect origin, depth distribution, migration lateral, CH4 oxidation, and dissolution in groundwater. The highest CH4 concentra...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18666280_v75_n4_p1_Sanci http://hdl.handle.net/20.500.12110/paper_18666280_v75_n4_p1_Sanci |
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paper:paper_18666280_v75_n4_p1_Sanci2023-06-08T16:29:44Z Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas Carbon dioxide Carbon isotopes Dissolved carbon Methane Carbon dioxide Gas emissions Groundwater Groundwater flow Isotopes Methane Municipal solid waste Solid wastes Urban growth Carbon isotopes Carbon stable isotopes Depth distribution Dissolved carbons Groundwater flow systems Hydrogen isotope exchange Isotopic composition Microbial sources Waste disposal carbon dioxide carbon isotope concentration (composition) deuterium diffusion dissolution dissolved inorganic carbon groundwater groundwater flow methane oxidation soil chemistry soil respiration solid waste stable isotope urban area waste disposal Argentina Entre Rios Gualeguaychu Isotopic compositions of CH4 and CO2 surface and subsurface gases and groundwater from an urban solid waste disposal site from Gualeguaychú city (Argentina) were measured to detect origin, depth distribution, migration lateral, CH4 oxidation, and dissolution in groundwater. The highest CH4 concentrations (60–88 %) with δ13C-CH4 (between −60 and −45 ‰) and δ2H-CH4 (between −350 and −260 ‰) were attributed to CH4 originated by microbial sources, v. gr. acetate fermentation. The δ13C-CO2 related to this CH4 (between −15 and −5.9 ‰) were compatible with this process. Also, the increase of DIC associated to an increase in δ13C-DIC values (−12.4, −6.4, −5.8, −1.5, +0.1 and +4 ‰) indicated the transport of dissolved gases (from methanogenesis) in the groundwater flow system. High excess deuterium in 3 piezometers suggests that there were hydrogen isotope exchange between CH4 and water too. Evidences for CH4 oxidation were decrease in CH4 concentrations, shift in C and H isotope ratios of CH4 to more enriched in the remaining CH4 (in both, δ13C-CH4 >−50 ‰ and δ2H >−260 ‰) and depletion in 13C of the associated CO2 (<−20 ‰). Since surface CH4 and CO2 concentrations over the covering layer were very low, and the major CH4 concentrations were found between 60m and 90 cm depth, it is very probable USW has been compacted with low permeability materials (e.g., clay) avoiding large emissions to the atmosphere and creating horizontal barriers within the waste that enable lateral gas migration. Horizontally, it can be seen that these gases migrated outside the disposal site following the topography and that CH4 disappeared leading to anomalous concentrations of CO2 whose values are greater than those produced by normal soil respiration. The isotopic value (δ13C) of this CO2 was also different from that of normal soil respiration (~−25 ‰) and reflected effects that generated isotopic depletion by diffusion (~−25 to −32 ‰). The analysis of C isotopes as the main tracer, together H isotopes, has allowed the effective detection of the origin and those secondary processes. © 2016, Springer-Verlag Berlin Heidelberg. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18666280_v75_n4_p1_Sanci http://hdl.handle.net/20.500.12110/paper_18666280_v75_n4_p1_Sanci |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Carbon dioxide Carbon isotopes Dissolved carbon Methane Carbon dioxide Gas emissions Groundwater Groundwater flow Isotopes Methane Municipal solid waste Solid wastes Urban growth Carbon isotopes Carbon stable isotopes Depth distribution Dissolved carbons Groundwater flow systems Hydrogen isotope exchange Isotopic composition Microbial sources Waste disposal carbon dioxide carbon isotope concentration (composition) deuterium diffusion dissolution dissolved inorganic carbon groundwater groundwater flow methane oxidation soil chemistry soil respiration solid waste stable isotope urban area waste disposal Argentina Entre Rios Gualeguaychu |
| spellingShingle |
Carbon dioxide Carbon isotopes Dissolved carbon Methane Carbon dioxide Gas emissions Groundwater Groundwater flow Isotopes Methane Municipal solid waste Solid wastes Urban growth Carbon isotopes Carbon stable isotopes Depth distribution Dissolved carbons Groundwater flow systems Hydrogen isotope exchange Isotopic composition Microbial sources Waste disposal carbon dioxide carbon isotope concentration (composition) deuterium diffusion dissolution dissolved inorganic carbon groundwater groundwater flow methane oxidation soil chemistry soil respiration solid waste stable isotope urban area waste disposal Argentina Entre Rios Gualeguaychu Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas |
| topic_facet |
Carbon dioxide Carbon isotopes Dissolved carbon Methane Carbon dioxide Gas emissions Groundwater Groundwater flow Isotopes Methane Municipal solid waste Solid wastes Urban growth Carbon isotopes Carbon stable isotopes Depth distribution Dissolved carbons Groundwater flow systems Hydrogen isotope exchange Isotopic composition Microbial sources Waste disposal carbon dioxide carbon isotope concentration (composition) deuterium diffusion dissolution dissolved inorganic carbon groundwater groundwater flow methane oxidation soil chemistry soil respiration solid waste stable isotope urban area waste disposal Argentina Entre Rios Gualeguaychu |
| description |
Isotopic compositions of CH4 and CO2 surface and subsurface gases and groundwater from an urban solid waste disposal site from Gualeguaychú city (Argentina) were measured to detect origin, depth distribution, migration lateral, CH4 oxidation, and dissolution in groundwater. The highest CH4 concentrations (60–88 %) with δ13C-CH4 (between −60 and −45 ‰) and δ2H-CH4 (between −350 and −260 ‰) were attributed to CH4 originated by microbial sources, v. gr. acetate fermentation. The δ13C-CO2 related to this CH4 (between −15 and −5.9 ‰) were compatible with this process. Also, the increase of DIC associated to an increase in δ13C-DIC values (−12.4, −6.4, −5.8, −1.5, +0.1 and +4 ‰) indicated the transport of dissolved gases (from methanogenesis) in the groundwater flow system. High excess deuterium in 3 piezometers suggests that there were hydrogen isotope exchange between CH4 and water too. Evidences for CH4 oxidation were decrease in CH4 concentrations, shift in C and H isotope ratios of CH4 to more enriched in the remaining CH4 (in both, δ13C-CH4 >−50 ‰ and δ2H >−260 ‰) and depletion in 13C of the associated CO2 (<−20 ‰). Since surface CH4 and CO2 concentrations over the covering layer were very low, and the major CH4 concentrations were found between 60m and 90 cm depth, it is very probable USW has been compacted with low permeability materials (e.g., clay) avoiding large emissions to the atmosphere and creating horizontal barriers within the waste that enable lateral gas migration. Horizontally, it can be seen that these gases migrated outside the disposal site following the topography and that CH4 disappeared leading to anomalous concentrations of CO2 whose values are greater than those produced by normal soil respiration. The isotopic value (δ13C) of this CO2 was also different from that of normal soil respiration (~−25 ‰) and reflected effects that generated isotopic depletion by diffusion (~−25 to −32 ‰). The analysis of C isotopes as the main tracer, together H isotopes, has allowed the effective detection of the origin and those secondary processes. © 2016, Springer-Verlag Berlin Heidelberg. |
| title |
Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas |
| title_short |
Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas |
| title_full |
Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas |
| title_fullStr |
Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas |
| title_full_unstemmed |
Carbon stable isotopes as indicators of the origin and evolution of CO2 and CH4 in urban solid waste disposal sites and nearby areas |
| title_sort |
carbon stable isotopes as indicators of the origin and evolution of co2 and ch4 in urban solid waste disposal sites and nearby areas |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18666280_v75_n4_p1_Sanci http://hdl.handle.net/20.500.12110/paper_18666280_v75_n4_p1_Sanci |
| _version_ |
1768545438292508672 |