- Rapport
Dry anaerobic digestion of food waste at mesophilic and thermophilic temperature
| 2019:609 | Emelie Persson, Maria Westerholm, Anna Schnürer, Annika Nordin, Daniel Tamm, Ulf Nordberg, IVL-Rapport B2341
Dry plug flow anaerobic digestion (AD) is a relatively new technology for the biological treatment of food waste. To avoid costly external hygienisation, most Swedish dry AD plants wish to operate under thermophilic conditions. However, source separated organics (SSO) with high nitrogen content increase the risk for ammonia inhibition at higher temperatures.
The hygenisation analysis indicated that a temperature >42 and <48 °C can be sufficient to reach pathogen reduction according to the ABP regulation. This means that at high ammonia level it might be possible to reach sufficient sanitation even at a high mesophilic/low thermophilic temperature. Being able to lower the process temperature slightly from 52–55 °C can give significant process advantages.
Ladda ner rapporten
Dry Anaerobic Digestion of Food Waste Energiforskrapport 2019-609