List of assumptions for each scenario

Table 1. Assumptions of the reference scenario (scenario "zero")

FACTORS / ASSUMPTIONS
Landfillgeometrical/volumetricproperties
Modellandfill / Underground
Landfillshape / Rectangular
Total waste volume(m3) / 800,000
Surface (at ground level)(m2) / 50,000
Landfillheight(m) / 23 m
Numberofsectors / 4
Landfilled waste inflow(t/year) / 88,000
Landfilledwastecomposition / Paper (1.5%), cardboard (1.5%), glass and inert (52%), plastic (12%), metals (35%), stabilised inert (15%), sludge (15%)
Landfilled waste density(t/m3) / 1.1
Top cover surface(ha) / 2.14 (4% slope) + 2.94 (24% slope)

Table 2. Assumptions of the first scenario (energy maximisation scenario)

FACTORS / ASSUMPTIONS
1) Scenario configuration
Landfill geometrical/volumetric properties / Same of scenario "zero"
Energy crop considered / Miscanthus (Miscanthus x giganteus)
2) Energy crop
Crop lifetime (year) / 15 (1st cycle) + 30 (2nd cycle)
Cultivation area (ha) / 2.14 (4% slope)
Crop yield (t/ha/year) / 0.00 (1st year)
10.00 (2nd year)
20.00 (3rd year)
25.00 (other years)
Energy input (GJ/ha/year) / 43.79 (1st year)
15.84 (from 2nd to 14th year)
30.46 (other years)
Low Heating Value - Energy output (GJ/t) / 17.60
Landfill phase / Aftercare

Table 3. Assumptions of the second scenario (phytotreatment scenario)

FACTORS / ASSUMPTIONS
1) Scenario configuration
Landfill geometrical/volumetric properties / Same of scenario "zero"
Energy crops considered / Sunflower (Heliantusannuus L), Rapeseed (Brassicanapus), Soybean (Glycine max)
2) Energy crops
Crops lifetime (years) / 4
Crops rotation / Biannual: Sunflower in spring-summer and Rapeseed seeding in autumn in the first year, Rapeseed harvesting at the end of the spring and Soybean cultivation in summer in the second year
Cultivation area (ha) / 0.64 (4% slope)
Crop yield (t/ha/year) / 2.0 (seeds) - 0.90* (Sunflower)
2.2 (seeds) - 0.77* (Rapeseed)
2.3 (seeds) - 0.44* (Soybean)
Energy input (GJ/ha/year) / 29.02** (Sunflower)
21.33** (Rapeseed)
27.18** (Soybean)
Low Heating Value - Energy output (GJ/t) / 38.40*
37.40*
36.40*
Landfill phase / Operation

* values referred to the final oil product

**values including the oil production

Table 4. Assumptions of the third scenario (environmental compensation scenario)

FACTORS / ASSUMPTIONS
1) Scenario configuration
Landfill geometrical/volumetric properties / Same of scenario "zero"
Energy crops considered / Poplars (green belt around the landfill perimeter and plantation along the south side of the landfill) and shrubs on the landfill top
2) Energy crops
Crops lifetime (years) / >30
Cultivation area (ha) / 0.70 (poplar green belt) + 0.62 (poplar plantation) +5(shrubs)
Crop yield (t/ha/year) / 16 (80 t/haevery 5 years)
Energy input (GJ/ha/year) / 45.66 (1st year)
23.36 (5th and 10th years)
29.55 (15th year)
7.99 (other years)
Low Heating Value - Energy output (GJ/t) / 17.80
Landfill phase / Aftercare

Table 5. Assumptions of the fourth scenario (combination scenario)

FACTORS / ASSUMPTIONS
1) Scenario configuration
Landfill geometrical/volumetric properties / Same of scenario "zero"
Energy crops considered / Miscanthus, Sunflower, Rapeseed, Soybean, poplars, shrubs
Crops lifetime (years) / 4 (Sunflower, Rapeseed, Soybean); 30 (Miscanthus), >30 (poplars and shrubs)
Cultivation area (ha) / 2.14 (Miscanthus); 0.64 (Sunflower, Soybean, Rapeseed); 0.70 + 0.62 (poplars); 5(shrubs)
2) Energy crops
The same values reported in Tables 2, 3, and 4 of this Annex were used

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