Anaerobic co-digestion of primary sludge and the fruit and vegetable fraction of the municipal solid wastes

X. Gómez, M.J. Cuetos, J. Cara, A. Morán and A.I. García

Renewable Energy, 2006, vol. 31, issue 12, 2017-2024

Abstract: This paper presents the results obtained for the digestion of primary sludge (PS) and co-digestion of this sludge with the fruit and vegetable fraction of municipal solid wastes (FVFMSW) under mesophilic conditions. This mixture was prepared with a PS content of 22%. The anaerobic digestion process was evaluated under static conditions and with different mixing conditions, with good results being found for the digesters with limited mixing, this representing an energy saving. The results for co-digestion of mixtures of PS+FVFMSW are better than those obtained from digestion of PS on its own. Biogas production for co-digestion is much greater thanks to the larger volatile-solid (VS) content of this feedstock. Nevertheless, biogas yield and specific gas production for the two digestion processes are similar, with values in the range 0.6–0.8lg−1 VS destroyed for the first parameter and in the range 0.4–0.6lg−1VS fed for the second. The co-digestion process was also evaluated at different organic loading rates (OLR) under low mixing conditions, with stable performance being obtained even when the systems were overloaded.

Keywords: Anaerobic digestion; Mesophilic; Primary sludge; Organic fraction of municipal solid wastes (OFMSW); Mixing conditions (search for similar items in EconPapers)
Date: 2006
References: View complete reference list from CitEc
Citations: View citations in EconPapers (29)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:31:y:2006:i:12:p:2017-2024

DOI: 10.1016/j.renene.2005.09.029

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