Abstract

JULIO GUERRERO, Ileana Consuelo; PELAEZ JARAMILLO, Carlos Alberto  and  MOLINA PEREZ, Francisco José. Anaerobic co-digestion of municipal sewage sludge with food waste. Rev. ion [online]. 2016, vol.29, n.1, pp.63-70. ISSN 0120-100X.  https://doi.org/10.18273/revion.v29n1-2016005.

Anaerobic digestion is a process widely used for the treatment of sludge generated during wastewater treatment, due to its technical and economic advantages. This paper presents a study in which the co-digestion of sewage sludge with food waste (FW) was evaluated as a strategy for optimizing the digestion of sludge. Mono-digestions and co-digestions of the substrates were performed under mesophilic conditions (35°C) using batch reactors. The sludge used were: primary sludge (PS), thickened secondary sludge (TSS), and a mixture of PS with TSS in a ratio 60:40 based on total solids (PS:TSS). The co-digestions were performed using different ratios of mixtures of the substrates based on total volatile solids: PS:FW=30:70, PS:FW=50:50, PS:FW=70:30 y (PS+TSS):FW=70:30. The maximum methane yield, 0,25LCH₄/gVSadded, was obtained for the mixture PS:FW=30:70, showing a yield 32% higher than the one obtained in the mono-digestion of PS.

Keywords : co-digestion; methane yield; primary sewage sludge; thickened secondary sludge; food waste.

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