Table 5.
Different physiochemical pretreatments applied to the production of biogas
| Biomass | Inoculum | Pretreatment | System | Anaerobic digestion | Degradation of lignin (%) | YieldAP | YieldBP | References |
|---|---|---|---|---|---|---|---|---|
| Agave tequilana bagasse | Anaerobic granular sludge | 2% (w/w) HCl and 2 h at 90 °C | Batch | 32 °C, pH 5 | – | 0.26 L CH4 g−1 COD | – | Arreola-Vargas et al. (2015) |
| Hay Straw |
Sludge | Calcium hydroxide (85 °C) Ammonium (120 °C) |
Batch (40 days) | 35 °C | – | 280 mL CH4 g−1 VS 320 mL CH4 g−1 VS (straw) |
320 mL CH4 g−1 VS 250 mL CH4 g−1 VS |
Fernandes et al. (2009) |
| Corn stover | Effluent of Biogas Plant | Steam explosion (SE) Thermal potassium hydroxide (KOH at 60 °C) |
Batch | 37 °C for 28 days | – | 217.5 mL CH4 g−1 VS 243 mL CH4 g−1 VS |
155.4 mL CH4 g−1 VS | Siddhu et al. (2016) |
| Sunflower stalk | Hydrothermal (180 °C for 1 h) Isopropanol-based organosolvent (160 °C for 30 min + H2SO4) |
Batch | 37 °C for 45 days | Up to 20.9% | 234 mL CH4 g−1 VS 278 mL CH4 g−1 VS |
124 mL CH4 g−1 VS | Hesami et al. (2015) | |
| Wheat straw Sugarcane bagasse |
Sludge wastewater | Alkaline autoclaving | Batch | 35 °C, 30 days | – | 286 mL CH4 g−1 VS 420 mL CH4 g−1 VS |
224 mL CH4 g−1 VS 222 mL CH4 g−1 VS |
Bolado-Rodriguez et al. (2016) |
| Wheat straw | Effluent anaerobic | Urea (1% w/w) | Batch | 35 °C, 120 rpm | – | 305.5 mL CH4 g−1 VS | 210.4 mL CH4 g−1 VS | Yao et al. (2018) |
HRT hydraulic retention time
APAfter pretreatment
BPBefore pretreatment