Table 2 Experimental levels of independent factors for the optimization of biogas production
From: Optimization of biogas production from anaerobic co-digestion of fish waste and water hyacinth
Factor | Parameters | Levels | ||||
|---|---|---|---|---|---|---|
− α | − 1 | 0 | 1 | + α | ||
X1 | Substrate ratio (g) (WH: FW) | 8:92 | 25:75 | 50:50 | 75:25 | 92:8 |
X2 | Inoculum concentration (g) | 1.6 | 5 | 10 | 15 | 18.4 |
X3 | Dilution (mL) | 81.6 | 85 | 90 | 95 | 98.4 |