Thermophilic anaerobic co-digestion of cattle manure with agro-wastes and energy crops: Comparison of pilot and full scale experiences
2010
Cavinato, C. | Fatone, F. | Bolzonella, D. | Pavan, P.
The paper deals with the benefits coming from the application of a proper process temperature (55°C) instead of a ‘reduced' thermophilic range (47°C), that is often applied in European anaerobic co-digestion plants. The experimental work has pointed out that biogas production improve from 0.45 to 0.62m³/kgVS operating at proper thermophilic conditions. Moreover, also methane content was higher: from 52% to 61%. A general improvement in digester behaviour was clear also considering the stability parameters comparison (pH, ammonia, VFA content). The second part of the study takes into account the economic aspects related to the capital cost of anaerobic digestion treatment with a 1MW co-generation unit fro heat and power production (CHP). Moreover, the economic balance was also carried out considering the anaerobic supernatants treatment for nitrogen removal. The simulation showed how a pay-back-time of 2.5yr and between 3 and 5yr respectively could be determined when the two options of anaerobic digestion only and together with the application of a nitrogen removal process were considered.
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