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Treatment combination and metformin content for the Automated Methane Potential Test System (AMPTS) test. COD: chemical oxygen demand; WWI: wastewater I; WWII: wastewater II.
| Treatments (Triplicates) | Sludge (mL) | Feed WWI (mL) | Feed WII (mL) | Feed COD (g) | Metformin (mg/L) |
|---|---|---|---|---|---|
| 1 (control) | 100 | - | - | ||
| 2 | 100 | 10 | 5 | 0.55 | 0.5 |
| 3 | 100 | 20 | 10 | 1.10 | 1.0 |
| 4 | 100 | 40 | 20 | 2.21 | 2.1 |
| 5 | 100 | 80 | 40 | 4.42 | 4.1 |
