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Table 4 Crude glycerol anaerobic digestion

From: Conversion of residues and by-products from the biodiesel industry into value-added products

Co-substrate Glycerol concentration (%) pH/temperature/ °C Retention time (days) Methane yield References
Sewage sludge 1 (v/v) 5/35 33 2353 mL/day (Fountoulakis et al. 2010)
Sewage sludge 3 7/37 12.3 0.8 L/g TVS (Athanasoulia et al. 2014)
Sewage sludge 0.63 (v/v) 7/35.0 20 1.3 m3/L crude glycerol (Nghiem et al. 2014)
Wastewaters 47 6.88/35.0 30 2.17 g/L/day (Watanabe et al. 2013)
80 7.6–8.9/37 1 0.9 L/mL (Hutňan et al. 2013)
Orange peel waste   7.19/35 8.5–30.0 330 mL/g VS (Martín et al. 2013)
Pig manure 3 55 15 0.47 L/g−1 VS (Astals et al. 2013)
Pig manure and fish waste 8 7.0–7.2/35 15.6 16.4 L/kg COD/day (Álvarez et al. 2010)
  1. VS volatile solids, TVS total volatile solids, COD chemical oxygen demand