પ્રક્રિયા ના આધારે

Equipment ના આધારે

Low rate digester

High rate digester

Single stage digester

Two stage digester

→ Intermittent mixing → Detention time: 30-60 days → Feed rate: 0.5 to 1.5 kg VS/m³ day

→ Continuous mixing → Detention time: < 15 days → Feed rate: 1.6 to 6.4 kg VS/m³ day