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Vibeke B. Karlsen, Gamunu Samarakoon, C. Dinamarca
This modeling study in Aquasim develops a comparative framework for sulphide bio-oxidation in anaerobic digestion using three electron acceptors: nitrate, oxygen, and a biotic anode. The model integrates H2S liquid-gas mass transfer, acid-base equilibrium, and bioelectrochemical kinetics via multiplicative Monod and Nernst-Monod expressions. Sensitivity analysis identifies maximum uptake rate (k_m^o) as the critical parameter. The tool enables prediction of H2S(g) headspace concentration and estimation of chemical dosage or electrode potential needed for sulphide removal to target levels.
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Sulphide (H2S, HS- and S2-) is an undesired by-product of biogas production processes. This modelling work in Aquasim was carried out to study three parallel processes related to sulphide in AD processes: 1) H2S liquid-gas mass transfer; 2) Acid-base equilibrium; and 3) Sulphide oxidation with three different electron acceptors; nitrate, oxygen, and a biotic anode with a given potential. Multiplicative Monod (biotic processes) and Nernst-Monod kinetics (bioelectrochemical process) provide the basis for the sulphide bio-oxidation processes. At the current stage, the model can be used to study sulphide bio-oxidation and the effect of relevant parameters, including initial biomass concentration, uptake rates, temperature, and pH. The model can be improved further by implementing anaerobic microbial processes as competing reactions. With the proposed improvements, the model can be a useful tool for calculating the chemical dosage or electrode potential required for sulphide removal. These calculations can be based on both the concentration of H2S(g) in the headspace (ppm) often available at full-scale plants and the concentration of sulphide (HS-(liq)) in effluent streams from the plants.