Reactor | Parameters | Units | Date of abrupt change (day) | Date of process failure (day) | Warning time (day) | Experimental results | Simulated results | ||
---|---|---|---|---|---|---|---|---|---|
Abrupt changea | Abrupt vs. steady-state value | Abrupt change | Abrupt vs. steady-state value | ||||||
R2 | CH4/CO2 | – | 161 | 160 | 0 | 1.00 | − 36.31 to − 25.48% | 0.86 | − 18.01 to − 21.33% |
Acetate | g/L | 153 | 160 | 7 | 0.52 | + 57.58 to 73.33% | 0.43 | + 36.43 to 303.98% | |
Propionate | g/L | 155 | 160 | 5 | 0.98 | + 390.00 to 444.44% | 0.12 | + 27.64 to 206.45% | |
VFA | g/L | 155 | 160 | 5 | 2.15 | + 225.76 to 305.66% | 0.80 | + 76.84 to 193.84% | |
IA | g CaCO3/L | 153 | 160 | 7 | 0.87 | + 37.09 to 62.18% | 0.32 | + 36.66 to 138.60% | |
BA** | g CaCO3/L | 154 | 160 | 6 | 1.04 | − 34.29 to − 22.27% | 0.89 | − 60.09 to − 11.46% | |
VFA/BA | – | 155 | 160 | 5 | 0.64 | + 36.17 to 88.24% | 0.94 | + 106.41 to 338.75 | |
BA/TA | – | 154 | 160 | 6 | 0.52 | − 36.59 to − 28.77% | 0.71 | − 25.57 to − 13.03% | |
IA/BA | – | 153 | 160 | 7 | 0.68 | + 47.83 to 65.95% | 0.34 | + 24.32 to 99.59% | |
pH | – | – | 160 | – | 6.33 | – | <6.4 | – | |
CH4 yield*** | L CH4/g VS | – | 163 | – | 0.09 | – | 0.07 | − 69.97 to 52.38% |