Two-Stage Anaerobic Digestion Process Combining Pre-digestion with Methanization

Authors

  • Mohammed Mohaibes

DOI:

https://doi.org/10.24126/jobrc.2015.9.2.436

Keywords:

Biogas, Anaerobic, Methanization, two-stage, sewage and manure

Abstract

Anaerobic digestion of a mixture of manure and sewage sludge by combination of the biological predigestion 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.

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Published

2015-06-01

How to Cite

Mohaibes, M. . (2015). Two-Stage Anaerobic Digestion Process Combining Pre-digestion with Methanization. Journal of Biotechnology Research Center, 9(2), 55–60. https://doi.org/10.24126/jobrc.2015.9.2.436

Issue

Section

Research articles