Abstract
In this study, a methane (CH4) mass balance was established for Hedeland landfill. CH4 generation rates were modelled using a multiphase first-order decay model (The Afvalzorg model) and determined at between 57 and 79 kg h−1. The CH4 emission rate was quantified at between 2 and 14 kg h−1, using the tracer gas dispersion method and the CH4 gas recovery efficiency was between 8 and 21%. At three places along the perimeter of the landfill, gas remediation systems have been installed to protect the residential houses from any risk of migrating landfill gas. About 0.76 kg h−1 of CH4 was extracted from these three remediation systems. Using a carbon mass balance for the lateral migrating landfill gas showed a fractional oxidation of about 78%, which corresponded to a CH4 flux of 3.5 kg h−1 from the three remediation systems, including the oxidised CH4. The total lateral CH4 flux (un-oxidised) from the total landfill perimeter was estimated at between 6.9 and 10.4 kg h−1. CH4 oxidation efficiency in the landfill cover soil, determined from stable carbon isotope analyses, was found to be between 12% and 92%. This resulted in an average CH4 oxidation rate of 32 kg h−1, using an average CH4 emission rate of 8 kg h−1. CH4 surface screenings and surface flux measurements supported the hypothesis that oxidation efficiency was in the higher range and that oxidation could close the CH4 mass balance.
| Original language | English |
|---|---|
| Journal | Waste Management |
| Volume | 102 |
| Pages (from-to) | 179-189 |
| ISSN | 0956-053X |
| DOIs | |
| Publication status | Published - 2020 |
Keywords
- Gas recovery
- Horizontal landfill gas migration
- Methane generation
- Methane oxidation efficiencies
- Oxidation in landfill cover soil
- Tracer gas dispersion method
Cite this
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Closing the methane mass balance for an old closed Danish landfill. / Fjelsted, Lotte; Christensen, A. G.; Larsen, J. E.; Kjeldsen, Peter; Scheutz, Charlotte.
In: Waste Management, Vol. 102, 2020, p. 179-189.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Closing the methane mass balance for an old closed Danish landfill
AU - Fjelsted, Lotte
AU - Christensen, A. G.
AU - Larsen, J. E.
AU - Kjeldsen, Peter
AU - Scheutz, Charlotte
PY - 2020
Y1 - 2020
N2 - In this study, a methane (CH4) mass balance was established for Hedeland landfill. CH4 generation rates were modelled using a multiphase first-order decay model (The Afvalzorg model) and determined at between 57 and 79 kg h−1. The CH4 emission rate was quantified at between 2 and 14 kg h−1, using the tracer gas dispersion method and the CH4 gas recovery efficiency was between 8 and 21%. At three places along the perimeter of the landfill, gas remediation systems have been installed to protect the residential houses from any risk of migrating landfill gas. About 0.76 kg h−1 of CH4 was extracted from these three remediation systems. Using a carbon mass balance for the lateral migrating landfill gas showed a fractional oxidation of about 78%, which corresponded to a CH4 flux of 3.5 kg h−1 from the three remediation systems, including the oxidised CH4. The total lateral CH4 flux (un-oxidised) from the total landfill perimeter was estimated at between 6.9 and 10.4 kg h−1. CH4 oxidation efficiency in the landfill cover soil, determined from stable carbon isotope analyses, was found to be between 12% and 92%. This resulted in an average CH4 oxidation rate of 32 kg h−1, using an average CH4 emission rate of 8 kg h−1. CH4 surface screenings and surface flux measurements supported the hypothesis that oxidation efficiency was in the higher range and that oxidation could close the CH4 mass balance.
AB - In this study, a methane (CH4) mass balance was established for Hedeland landfill. CH4 generation rates were modelled using a multiphase first-order decay model (The Afvalzorg model) and determined at between 57 and 79 kg h−1. The CH4 emission rate was quantified at between 2 and 14 kg h−1, using the tracer gas dispersion method and the CH4 gas recovery efficiency was between 8 and 21%. At three places along the perimeter of the landfill, gas remediation systems have been installed to protect the residential houses from any risk of migrating landfill gas. About 0.76 kg h−1 of CH4 was extracted from these three remediation systems. Using a carbon mass balance for the lateral migrating landfill gas showed a fractional oxidation of about 78%, which corresponded to a CH4 flux of 3.5 kg h−1 from the three remediation systems, including the oxidised CH4. The total lateral CH4 flux (un-oxidised) from the total landfill perimeter was estimated at between 6.9 and 10.4 kg h−1. CH4 oxidation efficiency in the landfill cover soil, determined from stable carbon isotope analyses, was found to be between 12% and 92%. This resulted in an average CH4 oxidation rate of 32 kg h−1, using an average CH4 emission rate of 8 kg h−1. CH4 surface screenings and surface flux measurements supported the hypothesis that oxidation efficiency was in the higher range and that oxidation could close the CH4 mass balance.
KW - Gas recovery
KW - Horizontal landfill gas migration
KW - Methane generation
KW - Methane oxidation efficiencies
KW - Oxidation in landfill cover soil
KW - Tracer gas dispersion method
U2 - 10.1016/j.wasman.2019.10.045
DO - 10.1016/j.wasman.2019.10.045
M3 - Journal article
VL - 102
SP - 179
EP - 189
JO - Waste Management
JF - Waste Management
SN - 0956-053X
ER -