Resumo

RINCON RAMIREZ, Maribet; RINCON LIZARDO, Nancy; MATA ALVAREZ, Joan  e  CHIRINOS, Iván. BIODEGRADABILITY OF PREPARED FOOD WASTE UNDER MESOPHILIC AND THERMOPHILICS CONDITIONS USING A COMPLETE MIX ANAEROBIC REACTOR. Cienc. Ing. Neogranad. [online]. 2014, vol.24, n.1, pp.29-48. ISSN 0124-8170.

This research examined the anaerobic digestion of prepared food waste (PFW) in a complete mix anaerobic reactor (CMAR) with a useful volume of 3.5 L, with discontinuous flow under mesophilic conditions (MC) at 37 ºC and thermophilic conditions (TC) at 55 ºC. Its objective was to evaluate the biodegradability of PFW with different biological sludge and hydraulic retention times (HRT). Prior to degradation, a biodegradability test was performed with different proportions of carbohydrates (C), fruits and vegetables (FV), and proteins (P). This test showed that the highest production of biogas was obtained by working with the proportion C:FV:P 24:71:5 in MC and TC. This proportion was digested in the CMAR with HRT of 30, 25 and 15 days in MC and TC. For the MC, ST removals of 59 % and 67 % were obtained, and VS removals of 76 % and 81 % were obtained for 30 and 25 days-HRT, with methane yields of 0.64 L/gVS_removed and 0.31 L/gVS_removed. In the 15 day-HRT, an instability was registered due to CO2 concentrations of 60 %. During the TC (30 days-HRT), 67 % of TS were removed, 80 % of VS were removed, and methane yields of 0.58 L/ gVS_removed were recorded. When the 25-days HRT was applied, the VFA increased until 2916 mg/L and the treatment was stopped. The best removals and biogas production were generated during the HRT of 30 d in MC with CACHAZA EFFLUENT sludge.

Palavras-chave : anaerobic reactor; food waste; biodegradability.

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