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Selected Publication:

Effenberger, M; Bachmaier, J; Garcs, G; Gronauer, A; Wilderer, PA; Lebuhn, M.
(2006): Mesophilic-thermophilic-mesophilic anaerobic digestion of liquid dairy cattle manure.
Water Sci Technol. 2006; 53(8):253-261 FullText FullText_BOKU

Abstract:
The potential of a mesophilic-thermophilic-mesophilic anaerobic digestion system was investigated with respect to improvement of both digestion and sanitation efficiencies during treatment of liquid cattle manure. The pilot plant produced a high methane yield from liquid dairy cattle manure of 0.24 m(3) (kg VSfed)(-1). Considering the low system loading rate of 1.4-1.5 kg VS (m(3) d)(-1), digestion efficiency compared to conventional processes did not appear improved. The minimum guaranteed retention time in the tubular thermophilic reactor was increased compared to a continuously stirred tank reactor. Levels of intestinal enterococci in raw liquid manure as determined with cultivation methods were reduced by 2.5-3 log units to a level of around 10(2) cfu/mL. This sanitizing effect was achieved both during mesophilic-thermophilic-mesophilic and thermophilic-mesophilic treatment, provided the thermophilic digester was operated at 53-55 degrees C. A change in feeding interval from 1 h to 4 h did not significantly alter methane yield and sanitation efficiency. It was proposed that a two-stage, thermophilic-mesophilic anaerobic digestion system would be able to achieve the same sanitizing effect and equal or better digestion efficiency at lower costs.
Authors BOKU Wien:
Gronauer Andreas
BOKU Gendermonitor:

Find related publications in this database (using NML MeSH Indexing)
Animals -
Bacteria, Anaerobic - metabolism
Biodegradation, Environmental -
Cattle -
Enterobacteriaceae - isolation & purification
Kinetics -
Manure - microbiology
Methane - biosynthesis
Sanitary Engineering -
Waste Disposal, Fluid - economics

Find related publications in this database (Keywords)
cattle manure
mesophilic anaerobic digestion
pilot plant
sanitation
thermophilic anaerobic digestion


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