KINETIC MODELLING OF GAS GENERATED FROM ANAEROBIC FERMENTATION OF KITCHEN WASTE WITH MICROAEROBIC PRETREATMENT

Anaerobic fermentation is one of the effective ways to achieve the harmless, resource -reducing and reducing of kitchen waste. In this paper, the oxygen content under initial conditions in the anaerobic fermentation process of kitchen waste was changed by experiment (for micro -oxygen pretreatment). It was verified that trace oxygen can optimize the anaerobic fermentation system and increase the rate of anaerobic fermentation. Through the study of the gas production characteristics of the micro -oxygen experiment group, by using the Logistic model and the modified Gompertz model, the R2 is above 0.99, and the fitting effect is better. The first-order hydrolysis model was combined with different particle reaction kinetic models to obtain a modified first-order gas production model. The results show that the air intake is suitable for the cylindrical particle model. The corresponding R-2 and k values for the air intake from 0 ml to 20 ml are: ln(y(m)) + ln(k) = 0.98298, k = 0.04339; ln(y(m)) + ln(k) = 0.96149, k = 0.04706; ln(y(m)) + ln(k) = 0.98219, k = 0.04611; ln(y(m)) + ln(k) = 0.94356, k = 0.05039; R-2 = 0.9327, k = 0.05149; the fitting effect is better. The population growth model and the modified primary gas production model can better describe the effect of oxygen content change on anaerobic fermentation gas production, and have important significance for the application of anaerobic fermentation in actual production and life processes.