Foaming is one of the most disruptive problems in a digester: it blocks the gas pipes, triggers alarms and can

Inside a digester live hundreds of species of microorganisms organised into four large groups: hydrolytic, acidogenic and acetogenic bacteria, and

Anaerobic digestion can operate in a mesophilic regime (35-40 °C) or a thermophilic one (50-57 °C). The thermophilic regime is

The C/N ratio (carbon-to-nitrogen ratio) is the parameter that measures the nutrient balance of the digester diet. The optimal range

Hydraulic retention time (HRT) is the average time the liquid stays inside the digester; SRT is the time the biomass

The organic loading rate (OLR) is the most important operating parameter of a digester: it measures how much organic matter