Biogas production facilities, with thermophile bacteria’s working at 55°C making methane/biogas, is a good market segment for Hybrid Energy’s hybrid heat pumps due to the high temperature heat source of the sludge after biogas production. The recovered heat can be used for heating the incoming sludge and the digestor tanks and other energy demands in the facility.  Generally, there is a demand for cooling of the sludge to reduce unpleasant smell from the sludge and an improved dewatering process after treatment of the sludge.


When the process has CO2 stripping for production of gas for vehicles, additional heat recovery possibilities and heat demands can be included in the total system making the economy for a heat pump system even better.


Most biogas production facilities have gas/biogas/biofuel/biomass/oil driven boilers/heaters or steam for heating of the processes. Cooling of sludge is often done by the treated sludge. The process also has a large demand for heating of process water, preheating of sludge, ventilation, sterilization of sludge and CO2 stripping. The sterilization process often has several batch reactors to separate incoming and outgoing sludge for hygienic reasons.


Traditional biogas processes have sometimes direct heat exchange of the hot sludge and cold sludge as energy recovery or no heat recovery at all. A Hybrid heat pump will increase the heat recovery considerably and is currently used in a modern biogas production facility.


The most energy efficient and modern factories recover the waste heat from the driers to feed thermal waste energy into heat pumps for coverage of heating demands in the factory. By cooling this exhaust sludge not only can you recover energy, but often also reduce smell in the surrounding of the factory.


The heat source and heat demands are usually present at the same time and the processes are very stable and well suited for a hybrid heat pump for maximum energy recovery and full utilization of the heat recovery system.