Energy recovery from grease traps wastes – potential for production of biodiesel and biogas | Energetische Nutzung von Fettabscheiderinhalten – Potenzial zur Erzeugung von Biodiesel und Biogas
2018
Lichtmannegger, Thomas | Kinzel, Carolina | Müller, Wolfgang | Bockreis, Anke
Grease traps as a resource provides low cost raw materials for renewable energy production. Optimal use of this resource can be achieved by separating the material fractions into oil and food particles. While the residues can be used in the co-fermentation to produce biogas, the separated oil can serve as a substrate for biodiesel production. In contrast to energy crops, this biodiesel from waste material does not compete with food production and contributes to sustainable and resource-saving energy production. Due to the unfavourable raw material quality, (high concentration of free fatty acids and sulphur) modern biodiesel production processes are necessary. The separated food residues with increased residual oil content still produce high biogas yields in co-fermentation, which makes optimum energy utilization possible.
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