Research Article
Nonlinear Optimization-Based Robust Control Approach for a Two-Stage Anaerobic Digestion Process
Table 1
Parameter values for the two-stage anaerobic digestion process.
| | Parameter | Meaning | Value |
| | Inlet concentration of acidogen | 0.1 g/L | | Inlet concentration of methanogen | 0.1 g/L | | Inlet concentration of organic substrate | 10 g/L | | Inlet concentration of VFAs | 40 mmol/L | | Inlet concentration of alkalinity concentration | 62 mmol/L | | Inlet concentration of inorganic carbon concentration | 65 mmol/L | | Maximum growth rate of acidogenic biomass | 4.2 d−1 | | Maximum growth rate of methanogenic biomass | 0.36 d−1 | | Half-saturation constant for S1 | 0.023 g/L | | Half-saturation constant for S2 | 2.3 mmol/L | | Inhibition constant for S2 | 66.67 mmol/L | | Y1 | Biomass yield for acidogens | 0.11 g/g | | Y2 | Biomass yield for methanogens | 0.00236 g/mmol | | Y3 | Yield for CO2 production | 50.6 mmol/g | | Y4 | Yield for CO2 production | 343.6 mmol/g | | Ym | Yield for CH4 production | 1.07 mmol/g | | c | Stoichiometric coefficient of the conversion of S1 to S2 | 16.95 mmol/g | | PT | Total pressure | 1 atm | | KH | Henry’s constant | 0.0246 kg·mol/m3bar | | KLa | Liquid/gas transfer rate | 19.8 d−1 |
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