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Anaerobic digestion of rum stillage

Anaerobic digestion of rum stillage

Canadian Institute of Food Science and Technology Journal 10(2): 105-108

The object of this study was to determine the feasibility of treating molasses stillage (approximately 55,000 ppm chemical oxygen demand [COD]), a by-product of rum production, by the anaerobic contact digestion process. Stillage is amenable to treatment by this process when supplemented with small amounts of ammonium and phosphate salts. Digesters held at 35.degree. C and loaded at rates up to 0.20 lb volatile solids/ft3 of digester/day (3.2 kg/m3 per day), operated with a 77-83% efficiency as determined by reduction in COD (from about 55,000-11,000 ppm). Fortification of the stillage with yeast extract (1.5 g/l) improved digester stability and permitted loading rates as high as 0.5 lb volatile solids/ft3 per day (8.0 kg/m3 per day), but did not affect clean-up efficiency. Tests on the effect of shock loading and reloading after a starvation period, showed that up to a 30% increase in loading rate did not affect the stability of digesters and that starvation periods up to 30 days were accommodated without problems.

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Accession: 004735961

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DOI: 10.1016/S0315-5463(77)73467-4

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