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Table 6 Cost overview per tonne of Elodea used (all figures in €/tonne)

From: Using aquatic plant biomass from de-weeding in biogas processes—an economically viable option?

Step Case 2
Elodea
Case 3
Elodea and straw mix
1. Cutting 31.68
2. Collecting
3. Transport 7.40
4. Pre-treatment 15.00 30.00
5. Ensiling 0.00 8.00
6. Fermentation (negative value = cost saved) − 0.19 52.65
7. Fermentation residue disposal 3.79 5.03
8. Elodea gate fee to offset disposal cost (income) − 30.00 − 30.00
9. Total for lines 4–8 loss/(profit) − 11.40 65.68
10. Total for lines 1–7 loss/(profit) 57.68 134.76a
  1. aIn case the Elodea is harvested only for the purpose of using it in a biogas plant, the water body owner does not save disposal cost and therefore would not be ready to pay a gate fee. Therefore, the gate fee cannot be subtracted in this case