Combustible gas production (methane) and biodegradation of solid and liquid mixtures of meat industry wastes
F. Cuadros and
Applied Energy, 2010, vol. 87, issue 5, 1729-1735
This work is devoted to determine the optimal operational conditions on the methane production as well as on the biodegradation obtained from the anaerobic codigestión of solid (fat, intestines, rumen, bowels, whiskers, etc.) and liquid (blood, washing water, manure, etc.) wastes of meat industry, particularly the ones rising from the municipal slaughterhouse of Badajoz (Spain). The experiments were performed using a 2 l capacity discontinuous digester at 38Â Â°C. The loading rate were 0.5, 1, 2, 3, and 4.5Â g COD for wastewater (washing water and blood; Mixture 1), and 0.5, 1, 2, 3, and 4Â g COD for the co-digestion of a mixture of 97% liquid effluent and 3% solid wastes v/v (Mixture 2) which represents the annual mean composition of the waste generated by the slaughterhouse. The maximal biodegradation rates obtained were: Mixture 1, 56.9% for a COD load of 1Â g; and Mixture 2, 19.1% for a COD load of 2Â g. For both mixtures, the greatest methane production was for the maximum COD load (4.5Â g for Mixture 1, and 4Â g for Mixture 2), at which values the amounts of methane obtained during and at the end of the co-digestion were practically indistinguishable between the two mixtures. The results will be used to design, construct, and establish the optimal operating conditions of a continuous complete-mixture biodigester.
Keywords: Decontamination; Meat; industry; Anaerobic; biodigestion (search for similar items in EconPapers)
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