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Understanding CDM Methodologies - SuSanA

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Project boundary<br />

Transport of<br />

Waste included in<br />

Project Boundary<br />

Baseline Scenario:<br />

Decay of Waste<br />

Fresh Waste: Use<br />

First Order Decay<br />

Model<br />

Old Waste in<br />

Landfill<br />

Differentiate<br />

Waste Age and<br />

apply First Order<br />

Decay Model<br />

according to each<br />

Waste Vintage<br />

The spatial extent of the project boundaries includes the project site, the<br />

sites where the organic waste is sourced, the sites where the final residues<br />

produced by the project activity will be deposited and the traveling routes<br />

between these three locations.<br />

Baseline scenario and additionality<br />

In the baseline scenario, it is assumed that the organic waste used by the<br />

project is left to decay within the project boundary, hereby generating<br />

methane emissions.<br />

The barrier analysis can be complemented by other tools, including the latest<br />

version of the “Tool for the demonstration and assessment of additionality”,<br />

may be use in a voluntary basis to enhance the additionality analysis.<br />

Baseline Emissions<br />

Projects combusting freshly generated waste: under this scenario,<br />

projects calculate their baseline emissions at any year “y”, using the amount<br />

and the composition of the waste combusted since the beginning of the<br />

project and the first order decay (FOD) model (see Box 36).<br />

Projects combusting waste that has partially decayed in a disposal<br />

site: This scenario requires that calculation of the yearly methane generation<br />

potential of the waste combusted from the project at any year “y” considers<br />

the age of the waste at the project start. In this case the project proponents<br />

may:<br />

(i)<br />

(ii)<br />

(iii)<br />

stimate the mean age of the waste contained in the disposal site at the<br />

beginning of the project, as the weighted average age of the waste.<br />

These should consider the yearly amount of waste deposited in the<br />

landfill site, from the inception of the site to the year preceding the<br />

beginning of the project.<br />

Calculate the yearly methane generation potential of the SWDS, taking<br />

into account the total amount and composition of waste deposited<br />

since the inception of the site. The methane generation potential of the<br />

waste removed for combustion up to the year “y” will be estimated as<br />

proportional to the mass fraction of that waste, relative to the whole<br />

waste mass in the SWDS.<br />

Estimate the quantity and the age distribution of the waste removed<br />

each year 244 , and calculate the methane generation potential of that<br />

waste in the year “y”.<br />

244<br />

The estimation of the age of the portions of waste being removed from the disposal site and combusted each<br />

year may be done by topographical modelling of the wastes present in the relevant sections of the SWDS. This<br />

approach should include segregation of the wastes into even-age layers or volumetric blocks based on historical<br />

or constructive data (design of the disposal site). Information on quantity, composition, and age may be based<br />

on (a) historical records of the yearly mass and composition of waste deposited in the section of the disposal<br />

site where waste is being removed for combustion; or (b) historical production data for cases in which the<br />

waste at the site is dominated by relatively homogeneous industrial waste material.<br />

99

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