Resumen

PARRA-OROBIO, Brayan Alexis et al. Effect of Substrate-Inoculum Ratio on the Biochemical Methane Potential of Municipal Biowastes. Ing. invest. y tecnol. [online]. 2015, vol.16, n.4, pp.515-526. ISSN 2594-0732.

Biowastes are the predominant fraction of municipal solid waste (MSW) of developing countries. Biowastes are characterized by a high content of organic matter; characteristics which facilitates its transformation through biological processes such as anaerobic digestion (AD). Using biochemical methane potential (PBM) assays, in this study we evaluated the influence of substrate-inoculum (S/I) ratio on the AD of biowaste from MSW. The S/I ranged between 0.25 to 9 gSV_sustrate*gSV_inocolum^-1. Sludge from an anaerobic digester of the domestic wastewater treatment plant located in Cali-Colombia, was used as inoculum. It were found that the S/I ratio has an effect on the AD (p < 0.1). Best results was obtained with the ratio 0.25 gSV_sustrate*gSV_inocolum^-1 (176.19 mLCH₄*gSV^-1  and a rate of 73.12% biodegradability), while 9 gSV_sustrate*gSV_inocolum^-1 produced the lowest results (17.56 and 7.29% respectively). Furthermore, it was found that S/I ratios lower than 2 gSV_sustrate*gSV_inocolum^-1 provided a suitable process. In the other hand, with S/I ratios greater than 2, the process becomes unstable due to acidification processes, caused by accumulation of VFA's; those VFA's cannot be he stabilized due to the low buffering capacity of the system.

Palabras llave : biowaste; anaerobic digestion; biochemical methane potential; substrate-inoculum ratio.

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