Could sulfate reducing bacteria (SRB) grow in the absence of sulfate?

Since lactate is known to be a preferred substrate by some Sulfate Reducing Bacteria, use thermodynamic principles to explore whether the following reaction could occur in an anaerobic digester environment:

CH3CHOHCOO- + H2O CH3COO- + CO2 + 2H2

Neutral pH, Temperature: 35C

If needed to calculate deltaG, you can assume lactate and acetate concentrations to be the same, and that the partial pressures of CO2 and CH4 are 0.4 atm and 0.6 atm, respectively.