Therefore, the aim of the current study was to test if different concentrations of urease inhibitor mixed with typical cattle slurry will have any (negative) effects on the biogas and methane yield. (HBT) was used to determine if the biogas and methane production of cattle manure is influenced by the admixture with urease
inhibitor. Altogether, four urease inhibitor concentrations (0%, 0.1%, 1% und 10% of total Kjeldahl nitrogen) were tested in the HBT experiments with two different substrates, cattle manure and cellulose, as a reference, in repetitions each. The average biogas and methane production of cellulose was 740 LN/kgODM and 403 LN/kg ODM and of cattle manure
471 LN/kgODM and 295 LN/kgODM. Both substrates treated with urease inhibitor showed no significant change in the biogas and methane production compared to the untreated ones.
The use of urease inhibitors to reduce ammonia is harmless from the view of biogas plants.