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Transport and Reaction Processes Affecting the Attenuation of Landfill Gas in Cover Soils

^a Univ. of British Columbia, Dep. of Earth and Ocean Sciences, 6339 Stores Road, Vancouver, BC, V6T 1Z4, Canada
^b Technical Univ. of Denmark, DTU Dep. of Environment & Resources, Building 115, DK-2800 Kgs. Lyngby, Denmark

View larger version (17K): [in this window] [in a new window]   Fig. 1. Experimental column set up (adapted from Scheutz and Kjeldsen, 2003).

View larger version (19K): [in this window] [in a new window]   Fig. 2. Gas concentrations. (a) N2, O2, CO2, and CH4. (b) Trichlorofluoromethane (CFC-11) and dichlorodifluoromethane (CFC-12). (c) Chlorodifluoromethane (HCFC-21) and chlorofluoromethane (HCFC-22). Experimental data in symbols; simulated results in solid lines.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Simulated oxidation rates. (a) CH4. (b) Trichlorofluoromethane (CFC-11) and dichlorodifluoromethane (CFC-12). (c) Chlorodifluoromethane (HCFC-21) and chlorofluoromethane (HCFC-22).

View larger version (34K): [in this window] [in a new window]   Fig. 4. Simulated flux components for (a) CH4, (b) CO2, (c) O2, and (d) N2.

View larger version (21K): [in this window] [in a new window]   Fig. 5. Simulated pressure and advective velocity.

View larger version (25K): [in this window] [in a new window]   Fig. 6. Concentrations of N2, O2, CO2, and CH4 (a) at low and (b) high gas influxes. Experimental data in symbols; simulated results in solid lines.

View larger version (34K): [in this window] [in a new window]   Fig. 7. Simulated fluxes at top of column for variable gas fluxes for (a) CH4 and (b) O2.

View larger version (13K): [in this window] [in a new window]   Fig. 8. Simulated fluxes at top of column for constant gas influx rate (0.24 m d–1) for O2.

View larger version (21K): [in this window] [in a new window]   Fig. 9. Simulated gas concentrations at influx rate of 0.24 m d–1 for a 70/30% v/v CH4/CO2 mixture.

View larger version (15K): [in this window] [in a new window]   Fig. 10. Simulated O2 flux at top of column for variable column saturation.

View larger version (25K): [in this window] [in a new window]   Fig. 11. Simulated cumulative consumption of CH4 for different saturations.

View larger version (19K): [in this window] [in a new window]   Fig. 12. (a) Simulated aqueous saturation at 180 d and (b) CH4 gas fluxes at 180 d, compared with CH4 net flux at steady-state conditions for the case with no water production.

View larger version (23K): [in this window] [in a new window]   Fig. 13. Simulated effect of the accumulation of exopolymeric substances on (a) pressure and advective gas flux at 180 d and (b) CH4 gas fluxes.