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Table 2 An overview of biogas yield data from co-digestions available in literature

From: Alternative energy supply system to a rural village in Ethiopia

Feedstock Feeding ratio Biogas yield Unit Ref.
Cow dung (CD) 100:0 0.280 m3/kg of TS [3, 27, 44]
Crop residues (CR) 100:0 0.400 m3/kg of TS [45, 46]
CD alone 100:0 0.233 m3 CH4 per kg VS [47]
CD and CR 60:40 0.268 m3 CH4 per kg VS
CD alone 100:0 0.210 m3/kg of VS [48]
CD, CR, and energy crops (EC) 50:25:25 0.540 m3/kg of VS
CD and corn stover (CS) 25:75 0.356 m3/kg of VS [37, 39]
CD and corn stover (CS) 50:50 0.325 m3/kg of VS
CD alone 100:0 0.230 m3/kg of VS [41]
CD and crop silage (CSi) 90:10 0.465 m3/kg of VS
CD and crop silage (CSi) 80:20 0.477 m3/kg of VS
Human excreta alone 100:0 0.35–0.5 m3/kg of TS [3, 43]
Food waste and human feces N/A 0.410 m3 CH4/kg of VS [43]
CD, urine, and water 50:0:50 37 L/kg of fresh dung [42]
CD, urine, and water 50:35:15 48 L/kg of fresh dung
  1. TS total solid, VS volatile solid