KINETIC ASSESSMENT OF THE ANAEROBIC DEGRADATION OF OLIVE-OIL PRODUCTION SOLID WASTE

摘要

Anaerobic digestion is nowadays a consolidated bioprocess which provides both treatment and energy waste conversion. Mathematical modeling must be now properly employed in the anaerobci digestion field so that they can be used for full scale scenario prediction, control and stability purposes. Biochemical methane test are widely used in anaerobic digestion field to evaluate the biodegradability of organic waste as well as the kinetic of methane conversion. The aim of the study was the application of mechanistic mathematical model in the anaerobic degradation of solid waste, olive pomace, from a three-phase processing plant. The influence of five different substrate/inoculum (S/X) ratios were assessed as the initial conditions of the test. A sensitivity analysis of the model parameters was carried out in order to evaluate the influence of the parameters on the accumulated methane produced throughout the test. The number of model parameter that may be identified changes in regards to the initial conditions of the test together with the their specific sensitivity over the test length. The mechanistic model was able to reproduce all the kinetic methane production. The ratio 0.5 presented the best results in terms of parameters sensitivity, however higher ratios may be also used for other parameters estimation such inhibition constant and initial biomass concentration. It is advisable, when possible, to employ this type of models for parameters estimation with data from batch tests.