TABLE 1.
Reaction no. | Reaction | Equation | ΔG0′, 37°C (kJ · reaction−1) |
---|---|---|---|
1 | Phthalate fermentation | C8H4O42− + 8H2O→3C2H3O2− + 3H+ + 3H2 + 2HCO3− | 38.9a |
2 | Benzoate fermentation | C7H5O2− + 7H2O→3C2H3O2− + 3H+ + 3H2 + HCO3− | 59.6 |
3 | Hydrogenotrophic methanogenesis | 0.75HCO3− + 0.75H+ + 3H2→0.75CH4 + 2.25H2O | −98.4 |
4 | Acetoclastic methanogenesis | 3C2H3O2− + 3H+→3CH4 + 3CO2 | −97.8 |
5 | Mineralization of phthalate | C8H4O42− + 6.5H2O→3.75CH4 + 2HCO3− + 2.25CO2 | −157.3 |
6 | Mineralization of benzoate | C7H5O2− + 5.5H2O→3.75CH4 + HCO3− + 2.25CO2 | −136.6 |
The value represents the calculated ΔG0′ for isophthalate and terephthalate fermentation; the value for ortho-phthalate fermentation is estimated to be 34.9 kJ · reaction−1. Applied ΔGf0 values for ortho-phthalate, isophthalate, and terephthalate were −548.6, −552.6, and −552.7, respectively (5).