The digestion temperature has an influence on the
ultimate methane yield, as well as the methane content. In the mesophilic temperature range,
25–35 °C, the higher the temperature, the better the methane yield. However, the yield did not
linearly increase with increasing tempera- ture. The yields at 30 and 35 °C were similar, but were
quite high compared to that at 25 °C, by more than 13–17%. However, this result does not
mean the higher temperature the more optimal, due to the larger energy requirement at higher
digesting temperatures. Therefore, careful consider- ation of the net energy balance between the
increased heat- ing energy demands and improved additional methane production at higher operating
temperatures must be simultaneously taken into account when deciding the eco- nomical digesting
temperature. Furthermore, this net energy balance is inevitably dependent upon the VS con- tent
of the feed, as methane comes from the degradation of VS. Temperature shocks led to a reduction
in the biogas production rate compared to that of the control,
The digestion temperature has an influence on theultimate methane yield, as well as the methane content. In the mesophilic temperature range, 25–35 °C, the higher the temperature, the better the methane yield. However, the yield did not linearly increase with increasing tempera- ture. The yields at 30 and 35 °C were similar, but were quite high compared to that at 25 °C, by more than 13–17%. However, this result does not mean the higher temperature the more optimal, due to the larger energy requirement at higher digesting temperatures. Therefore, careful consider- ation of the net energy balance between the increased heat- ing energy demands and improved additional methane production at higher operating temperatures must be simultaneously taken into account when deciding the eco- nomical digesting temperature. Furthermore, this net energy balance is inevitably dependent upon the VS con- tent of the feed, as methane comes from the degradation of VS. Temperature shocks led to a reduction in the biogas production rate compared to that of the control,
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