Page 339 - Materials Chemistry, Second Edition

L1644_C08.fm Page 307 Tuesday, October 21, 2003 3:03 PM

FIGURE 8.1 The software model and database WISARD.

8.2.2.2 Goal and Scope Definition
In this case study, the LCA methodology is applied to the treatment of MHSW in
a typical medium-size Spanish landfill in order to evaluate the environmental impact
of landfilling through the entire life-cycle associated with this waste management
activity. Wastes have been considered the main input to the system; 50,000 t of
MHSW produced and landfilled annually in the studied area are considered the
functional unit of the LCA. Figure 8.2 shows the flow diagram of the system studied
with the corresponding main inputs and outputs considered.

Free discharge
(50%)
Biogas Emissions to Air
Energy generation
Combusted in
flame (50%)
MHSW Containers Collection Transport Landfill Emissions to Soil
Free discharge
(20%)
Leachate
Raw production Emissions to Water
Materials
Biological
treatment (80%)

FIGURE 8.2 Flow diagram of landfilling activity.

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