The technologies of HERA in biogas production by anaerobic digestion: SCHWARTING BIOSYSTEM, is a subsidiary of HERA, that owns the expertise and numerous references of biogas and anaerobic digestion plant buildings. The company is able to build plants for the mono and co-digestion of organic waste such as: - food waste (packed and not packed, past their date) - brewer's spent grain - animal by-products obliged to sterilization (cat II or III) - manures, fertilizers … - renewable primary products - fats and contents of grease separator