Environmental Engineering Reference
In-Depth Information
With a value of β in the range of 2-2,5, it is possible to obtain quite good accordance
between real data, after the recirculation beginning, and model results, as shown in Figure 12.
Figure 12. Model results applying different β coefficients.
Further, the modified model has been applied to a hypothetical study case - characterised
by the waste component characterisation and amount of MSW yearly landfilled reported in
Table 12 - in order to understand the behaviour differences between a conventional landfill
and a landfill with leachate recirculation.
Table 12. Waste component characterisation and yearly landfilled amount
for the hypothetical study case
Material
Mass composition [%]
Year
MSW [t]
Organic matter
36,3
1
113.873
Paper and cardboard
21,4
2
111.163
Plastics
12,0
3
107.655
Textiles
5,9
4
104.538
Pruning scrap
3,5
5
101.775
Wood
3,5
6
99.521
Glass and inert
11,0
7
98.865
Metals
6,4
The model results, in terms of produced LFG, are plotted in Figure 13. It is quite
important to note that in the case of landfill with leachate recirculation the 95% of LFG is
produced ten years before than in the conventional landfill case. This feature allows the
concentration of energy recovery during a smaller period of time.
