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International Review of Waste Management Policy - Department of ...

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Table 63-6: Landfill Gas <strong>Management</strong> – Untreated <strong>Waste</strong><br />

Parameter Parameter Parameter<br />

Assumption<br />

Assumption<br />

Proportion <strong>of</strong> methane captured (central assumption) 1 50%<br />

Proportion <strong>of</strong> captured methane used for energy generation 60%<br />

Proportion <strong>of</strong> captured methane that is flared 40%<br />

Efficiency <strong>of</strong> electricity generation, landfill gas engine 35%<br />

Rate <strong>of</strong> oxidation <strong>of</strong> methane within the landfill cover 10%<br />

Notes<br />

994<br />

1. Results obtained assuming 20% <strong>of</strong> the gas is captured are considered as sensitivity<br />

analysis<br />

Table 63-7 outlines the central assumptions used to model the behaviour <strong>of</strong> pretreated<br />

waste in landfill.<br />

Table 63-7: Landfill Gas <strong>Management</strong> – Pre-treated <strong>Waste</strong> (Central Assumptions)<br />

Parameter Parameter<br />

Assumption Assumption<br />

Assumption<br />

Proportion <strong>of</strong> methane captured 0%<br />

Rate <strong>of</strong> oxidation <strong>of</strong> methane within the landfill cover 90%<br />

Notes<br />

We also present results assuming the same landfill gas management as described in Table<br />

63-6 for sensitivity analysis<br />

63.2.2 Air Quality Impacts <strong>of</strong> Landfill<br />

63.2.2.1 Landfill <strong>of</strong> Untreated <strong>Waste</strong>s<br />

Whilst landfill gas is principally comprised <strong>of</strong> methane and carbon dioxide,<br />

approximately 1% <strong>of</strong> the volume <strong>of</strong> the gas is made up <strong>of</strong> trace elements. This can<br />

29/09/09

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