A chemostat study of BSR was carried out using anaerobic digestate as a carbon source and electron donor. These data and their kinetic analysis are presented in Chapter 5. Here the effect of the volumetric sulphate loading rate (VSLR), which was mediated through dilution rate and feed sulphate concentration on volumetric sulphate reduction rate (VSRR), is reported and discussed. Mathematical models previously used for acetate, ethanol and lactate were fitted to describe the effect of feed sulphate concentration on the BSR kinetics when anaerobic digestate was used as a carbon source and electron donor.