Enwise implemeted a containerized green power station at Volkswagen Dalian to process its kitchen waste through anaerobic digestion.Employee canteen operates at 7/7, lower food waste generation during weekend. Daily food waste average volume at 500-600kg, peak daily food waste volume at 1000kg. The selected energy output is biogas, the purified biogas can be connected to hot water boiler to produce hot water for the back kitchen.
Enwise has selected an Oscar model M45 unitwhose processing capacity is 1000 kg/day. The Oscar is provided in two customized containers. The gas storage is provided on the roof of the digestion vessel.
- The current digester module isdesigned to process 1000 kg/day of food waste with possibility to extend to 3000 kg/day by adding extra digesters in the future project.
- The technical module has takenthe future biogas processing capacity into consideration, it is able to process 3000 kg/day of food waste input with current design.
The dry anaerobic digestor process includes:
- A shredding of the waste to amaximum size of 50mm without any water addition.
- A thermophilic dry anaerobicphase with a 30 to 40 days retention time.
- A gas holder at 20m3to store temporarily the biogas generated from digestor.
- A biogas purification unit withdewatering and desulfuration process.
- A post-treatment of digestatewith phase separation and fast composting unit.