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Two-Stage Anaerobic Digestion Process Combining Pre-digestion with Methanization | ||
| Jornal of Biotechnology Research Center | ||
| Article 1, Volume 9, Issue 2, 2015, Pages 55-60 | ||
| Author | ||
| Mohammed Mohaibes | ||
| Abstract | ||
| Anaerobic digestion of a mixture of manure and sewage sludge by combination of the biological pre-digestion at 73°C with methanization at 55°C was studied with regard to the biogas process efficiency, energy balance and sanitation effect. Performance of the two-stage digestion was compared with the conventional, one-stage moderate thermophilic digestion at 55°C and mesophilic digestion at 37°C, respectively. The best performance was achieved by the two-stage treatment both in terms of Volatile Solids (VS) removal and biogas yield. Up to 60% of VS was removed and a specific methane yield of 300 ml CH4 gVS-1 was achieved. Sanitation effect was measured as inactivation of the indicators of bacterial pathogens - the faecal enterococci and spores of Clostridium perfringens. Elimination of faecal enterococci to non-detectable level occurred only during treatments at 73°C and 55°C. Numbers of Clostridium perfringens spores were reduced solely by the combined 73°C/55°C treatment. | ||
| Keywords | ||
| Biogas; Anaerobic; Methanization; Two; stage; sewage and manure | ||
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