What is the acceptable margin of error for the oxygen uptake method in evaluating the reactivity of organic waste?
2014
Di Maria, Francesco | Micale, Caterina
The acceptable margin of error for the organic waste reactivity measured by the oxygen uptake method was assessed. Oxygen uptake was determined by the Dynamic Respiration Index (DRI) (mgO2/kgVSh). The composed uncertainty (uC) of the experimental set up used for the DRI test was evaluated and the uncertainty (u) of all the components of the apparatus was evaluated. A procedure for calculating the uC of the apparatus is proposed. The components affecting the uC of the DRI to a more significant extent were the one of the oxygen mass rate and the u of the amount of VS in the sample analyzed. For a confidence level of 99.73%, the extended uC (UC) interval for a DRI=1024mgO2/kgVSh was ±440mgO2/kgVSh, whereas for a DRI=3489mgO2/kgVSh, the UC interval was ±1288mgO2/kgVSh. When oxygen consumption and VS content become lower than 600mgO2/h and 0.9kg, respectively, the UC interval is similar to the measured DRI.
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