Abstract

SOTO, Jonathan et al. DISSOLVED OXYGEN EFFECT ON THE BIODEGRADABILITY OF BIOWASTE. rev.udcaactual.divulg.cient. [online]. 2015, vol.18, n.2, pp.485-495. ISSN 0123-4226.

Composting is one of the most used technologies for the use of municipal biowaste - MBW. Being an aerobic process, the efficiency of aeration can affect the development of the process and product quality. In this study, we evaluated at laboratory scale, the influence of the concentration of dissolved oxygen- OD on aerobic biodegradability of BOM of a municipality, where segregation practices are performed at the source and selective collection; for this five concentrations of OD (<0.5; 1.0; 1.5; 2.0; 2.5mg L^-1) was studied by differential first-order kinetic model to determine rates Substrate Utilization-TUS, biomass growth rates-TCB and through respirometry the rate of oxygen consumption-TCO. Statistics from a mixed linear model analysis and Tukey test (p <0.05) were performed, finding that concentrations of OD assessed, fall into three groups in terms of COD reduction: i) less than 0.5mg OD * L^-1); ii) 1.0 ≤OD≤ 1.5mg L^-1 and iii) 2.0 ≤OD≤ 2.5mg L^-1, the latter in which the most favorable conditions for the transformation kinetics are presented substrate with TUS between 0,18 to 0,21 d^-1, in which they have the greatest TCO and TCB. In contrast, groups i and ii presented TUS between 0.02 and 0.12d^-1, indicating that the OD affects the transformation of the substrate.

Keywords : Use; cynetics; composting; solid waste.

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