Modelling of gas pressure effects on anaerobic digestion

The model of anaerobic digestion described earlier by the authors was used for analysis of a pressure change as a method of avoiding a gas component toxicity. The model, calibrated for laboratory-scale reactors, showed that an increase in pressure reduced ammonia inhibition during simulated cattle-manure digestion. A decrease in pressure reduced free hydrogen sulfide inhibition during a sulfate overload of an anaerobic digestion of a synthetic feedstock.