S/N | Biomass | Pretreatment | Size | Concentration | Anaerobic digestion condition | Effect | Refs |
---|---|---|---|---|---|---|---|
1 | Fresh raw manure | Fe3O4 | 7 nm | 20 mg/L | 37 °C for 40 Days | 73% and 115.66% increase in biogas and methane yield, respectively | [204] |
2 | Sludge from UASB reactor | CeO2 | 192 nm | 10 mg/L | 30 °C for 40 Days | 11% Increase in biogas production | [203] |
3 | Fresh raw manure | Co | 28 nm | 1 mg/L | 37 °C for 40 Days | 71% and 45.92% improvement in biogas and methane released, respectively | [204] |
4 | WAS | ZnO | 140 nm | 10 mg/g-TSS | 35 °C for 40 Days | No effect | [202] |
5 | WAS | Fe2O3 | < 30 nm | 100 mg/g-TSS | 37 °C for 40 Days | 117% increase in methane production | [201] |
6 | AGS | CuO | 37 nm | 1.4 mg/L | 30 °C for 83 Days | 15% Decrease in methane production | [205] |
7 | Waste sludge | Ag | 40 nm | 184, 77 and 6.3 mg/kg | 36 °C for 38 Days | No effect | [200] |
8 | WAS | TiO2 | 185 nm | 150 mg/g-TSS | 35 °C for 105 Days | No effect | [199] |
9 | Sludge from UASB | ZnO | 850 nm | 10 mg/l | 30 °C for 40 Days | 8% Decrease in biogas production | [203] |
10 | Sludge from UASB | ZnO | 850 nm | 1000 mg/l | 30 °C for 40 Days | 65% Decrease in biogas production | [203] |