Solid Anaerobic Digestion Batch (SADB) has some peculiar features that can lead to a wider exploitation of Anaerobic Digestion (AD) also in the field of Waste Management. Limited waste liquid production along with waste pre-treatment needs represents two main advantages achievable with SADB. Anyway, high Volatile Solids (VS) concentration can lead to excessive Organic Load (OL) (gVS/kg) causing inhibition mainly of the methanogenic phase and consequently process failure. Several strategies are suitable for avoiding this risk leading to a stabile biogas yield ranging from about 400 to 600 Nl/kgVS. Further the solid fraction of the digestate, >90%, shows quite good features from the agronomic point of view even if some residual phytotoxicity has been evaluated. The Germination Index (GI) measured by Lepidium sativum L seeds, achieves values ranging from about 40 up to 50%. These values are lower than the suggested value of 60% even if results compatible with several field crops.
The Dry Batch Anaerobic Digestion: Biogas Yield and Digestate Organic Matter Quality
DI MARIA, Francesco;GIGLIOTTI, Giovanni;ZADRA, Claudia;
2012
Abstract
Solid Anaerobic Digestion Batch (SADB) has some peculiar features that can lead to a wider exploitation of Anaerobic Digestion (AD) also in the field of Waste Management. Limited waste liquid production along with waste pre-treatment needs represents two main advantages achievable with SADB. Anyway, high Volatile Solids (VS) concentration can lead to excessive Organic Load (OL) (gVS/kg) causing inhibition mainly of the methanogenic phase and consequently process failure. Several strategies are suitable for avoiding this risk leading to a stabile biogas yield ranging from about 400 to 600 Nl/kgVS. Further the solid fraction of the digestate, >90%, shows quite good features from the agronomic point of view even if some residual phytotoxicity has been evaluated. The Germination Index (GI) measured by Lepidium sativum L seeds, achieves values ranging from about 40 up to 50%. These values are lower than the suggested value of 60% even if results compatible with several field crops.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
