Abstract
This study quantifies the share of aerobically produced carbon (aeration efficiency) during six years of a full scale landfill aeration project using the balance between methane and carbon dioxide in the bulk extracted gas. Aeration was realized by overextraction. Aeration enhanced carbon release in comparison to the anaerobic ‘base case’, as predicted by the Afvalzorg multiphase model, by a factor of 3.7. Aeration efficiency, averaging around 44%, varied seasonally, and was lower in periods of low or no evapotranspiration and hence higher moisture content in the landfill cover soil (winter). Higher aeration efficiencies were observed when evapotranspiration enables increased cover soil permeability (summer). Correspondingly, aeration efficiency was linearly related to the concentration of N2 in the bulk extracted gas. To a lesser extent, condensate and its removal also affected flow and hence the aeration efficiency. Except for the modulation by seasonal effects, the cumulative amount of extracted ‘aerobic carbon’ increased linearly over time, independent of changes in the blower pressure and flow. This suggests that below the cover soil, within the waste body, flow is chanelled in preferential pathways, limiting the intrusion of oxygen into the bulk waste. Aeration can hence only be enhanced by reducing well spacing. The blower efficiency, assessed by the ratio of flow to pressure, decreased markedly over time, likely indicating diminishing waste permeability as a result of waste consolidation.
Original language | English |
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Title of host publication | Proceedings SARDINIA 2023 |
Subtitle of host publication | 19th International Waste Management and Landfill Symposium |
Place of Publication | Cagliari, Italy |
Publisher | CISA Publisher |
Number of pages | 8 |
Publication status | Published - 2023 |
Event | 19th International Symposium on Waste Management, Resource Recovery and Sustainable Landfilling - Forte Village Resort, Santa Margherita di Pula, Italy Duration: 9 Oct 2023 → 13 Oct 2023 https://www.sardiniasymposium.it/ |
Publication series
Name | Sardinia Symposium Proceedings |
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Publisher | CISA Publisher |
ISSN (Print) | 2282-0027 |
Conference
Conference | 19th International Symposium on Waste Management, Resource Recovery and Sustainable Landfilling |
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Abbreviated title | SARDINIA 2023 |
Country/Territory | Italy |
City | Santa Margherita di Pula |
Period | 9/10/23 → 13/10/23 |
Internet address |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-careOtherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Keywords
- in-situ stabilization
- aeration
- over-extraction