A Comparative Model-Analysis on Sulphide Bio-oxidation with Different Electron Acceptors

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 sulphide AD processes: 1) H2S liquid-gas mass transfer; 2) Acid-base equilibrium; 3) oxidation with different electron acceptors; nitrate, oxygen, a biotic anode given potential. Multiplicative Monod (biotic processes) Nernst-Monod kinetics (bioelectrochemical process) provide the basis for bio-oxidation At current stage, model can be used effect relevant parameters, including initial biomass concentration, uptake rates, temperature, pH. The improved further by implementing anaerobic microbial as competing reactions. With proposed improvements, useful tool calculating chemical dosage or electrode potential required removal. These calculations based on both concentration H2S(g) headspace (ppm) often available at full-scale plants (HS-(liq)) effluent streams from plants.