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Table 1 Input variables

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

Variable Unit Value Source
Electrical power kWe 500 [2]
Full load hours h/a 8000 [56, 57]
Electrical efficiency % 40 [58,59,60,61,62,63]
Digester volume Cubic meter (cbm) 2570 [64]
Year of commissioning
Dry matter (DM) content
Year 2010 We assume that the plant is in its sixth year of operation
 DM of maize silage % 34 [65, 66]
 DM of Elodea silage % 7 [27]
 DM of Elodea-straw mix silage % 30 [27]
Volatile solids maize silage % of DM 95 [67]
Volatile solids Elodea silage % of DM 80 [24], for fresh material not silage
Volatile solids Elodea-straw mix silage % of DM 90 Estimation
Methane potential of maize silage cbm/tonne fresh matter (FM) 110 [3, 62, 67,68,69,70]
Methane potential of Elodea silage cbm/tonne FM 15 [27]
Methane potential of Elodea-straw mix cbm/tonne FM 50 [27]
Feed-in-tariff for energy crops EUR/kWhe 0.20 [71]; we used the RESA 2009 since the number of newly erected biogas plants reached a peak during 2009–2011
Feed-in-tariff for waste EUR/kWhe 0.13 [71]; RESA 2009
Disposal cost for aquatic biomass (biogas plant gate fee) EUR/tonne 30.00 Based on our survey
Disposal cost for digestate EUR/tonne 5.00 [32]
Cost of maize silage (fresh matter) EUR/tonne 40 [38, 63, 70, 72, 73]
Cost of straw (fresh matter) EUR/tonne 81.41 [74]
Calorific (heating) value of methane kWh/cbm 9.97 [75]
Utilization percentage of methane potential % 98a
96b
97c
Estimations based on [34]
Digestate/input ratio % 85 [76,77,78,79]
  1. aPure maize silage
  2. b10% of methane potential from Elodea
  3. c10% of methane potential from Elodea/Straw