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

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Table 63-27: Summary <strong>of</strong> Damage Costs – Composting Systems<br />

1025<br />

<strong>International</strong> <strong>Review</strong> <strong>of</strong> <strong>Waste</strong> <strong>Policy</strong>: Annexes<br />

Damage Damage costs, costs, € per tonne <strong>of</strong> input to process process<br />

In In vessel vessel<br />

Windrow<br />

Windrow<br />

High High Low Low Low High High Low<br />

Low<br />

Climate Change €14.59 €12.21 €14.89 €12.44<br />

Air Quality €2.76 €0.96 €9.02 €3.16<br />

Benefits – use <strong>of</strong> compost - €12.71 - €11.68 - €13.27 - €12.36<br />

TOTALS €4.63 €1.49 €10.64 €3.24<br />

Notes<br />

The feedstock for the in vessel composting system is assumed to comprise <strong>of</strong> 70%<br />

garden waste and 30% food waste.<br />

63.9 Anaerobic Digestion <strong>of</strong> Food <strong>Waste</strong><br />

The environmental impacts associated with the anaerobic digestion (AD) <strong>of</strong> food<br />

waste depend in part on how the biogas produced by the process is subsequently<br />

utilised. The sections that follow discuss these impacts with reference to the following<br />

possible uses <strong>of</strong> the gas:<br />

1. On-site combustion <strong>of</strong> biogas, generating electricity;<br />

2. Biogas upgrading and its subsequent use as a vehicle fuel displacing the use<br />

<strong>of</strong> diesel in a heavy goods vehicle such as a bus.<br />

63.9.1 Climate Change Impacts<br />

CO2 emissions resulting from the AD <strong>of</strong> source-separated organic waste are based on<br />

the carbon content <strong>of</strong> the input waste, assumed to 100% food waste for the purposes<br />

<strong>of</strong> this study. The carbon content is calculated on the basis <strong>of</strong> the total organic<br />

content <strong>of</strong> the waste and its volatile solids (VS) content. A proportion <strong>of</strong> the total<br />

carbon content will be converted to CO2 as a result <strong>of</strong> biogas combustion for energy<br />

generation. A further (albeit small) amount is emitted as CH4 through fugitive<br />

emissions occurring during the digestion process. Table 63-28 outlines key<br />

assumptions used to model the AD process within this study. 1271<br />

1271 For more information regarding the methodology used to model the AD process see Eunomia<br />

(2007) Managing Biowastes from Households in the UK: Applying Life-cycle Thinking in the Framework<br />

<strong>of</strong> Cost-benefit Analysis, Appendices to the Main Report, Report for WRAP, May 2007

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