THE INFLUENCE OF MIXING, ADDITION OF BUFFER, SILAGE AND CHICKEN MANURE ON THE BIOGAS PRODUCTION FROM CATTLE MANURE

摘要

A number of batch experiments were performed in order to evaluate the biogas production from cattlemanure after addition of a buffer, silage or chicken manure. Some experiments were also performed to investigate theeffect of mixing. All experiments were performed at 35 ℃. The results showed that the extent of the mixing did notaffect the biogas production in any larger extent. The addition of a buffer speeds up the start of the biogas productionand increased the volume of biogas produced. The methane content was approximately the same independently on if abuffer was added or not. Chicken manure inhibited the process and addition of silage gave an increase in the amount ofbiogas produced. No significant effect of silage addition was found on the methane content of the biogas.