Table 1 Chemical reactions involved in sucrose degradation to biogas in this study

From: Bioenergetically constrained dynamical microbial interactions govern the performance and stability of methane-producing bioreactors

Equations

Reactions

ΔG330′ 2 (kJ/reaction)

1

Sucrose(aq) + 2H2O(l) → 2.3Butyrate(aq) + H2(g) + 2.8HCO3−(aq) + 5.1H+(aq)

−639

2

Sucrose(aq) + 2H2O(l) → 3.29Propionate(aq) + H2(g) + 2.14HCO3−(aq)

−642

3

Sucrose(aq) + 2H2O(l) → 5.75Acetate(aq) + H2(g) + 0.5HCO3−(aq) + 6.25H+(aq)

−649

4

Butyrate(aq) + 2H2O(l) → 2Acetate(aq) + H+(aq)+2H2(g)

46

5

Propionate(aq) + 3H2O(l) → Acetate(aq) + HCO3−(aq) + H+(aq)+ 3H2(g)

73

6

2Propionate(aq) → Acetate(aq) + Butyrate(aq)

0.08

7

Acetate(aq) + 4H2O(l) → 2HCO3−(aq) + H+(aq)+ 4H2(g)

101

8

4H2(g) + HCO3−(aq) + H+(aq) → CH4(g) + 3H2O(l)

−133

9

Acetate(aq) + H2O(l) → CH4(g) + HCO3−(aq)

−32

Overall reaction

Sucrose(aq) + y1iH2O(l) → x1iAcetate(aq) + x2iPropionate(aq) + x3iButyrate(aq) + x4iCO2(g) + x5iCH4(g) + x6iH2(g) + x7iHCO3-(aq) + x8iH+(aq)

–

  1. The overall reaction represents the equilibrium reaction from sucrose to metabolites, where i denotes the operation date.
  2. Equations related to alcohols are excluded as effluent COD is primarily constituted by C2-C4 fatty acids.
  3. ΔG330′ is the standard Gibbs free energy change at 33 °C adjusted using the Van ‘t Hoff equation.
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