The study presents a modified mass transfer model for predicting the kinetic parameters and diffusivity coefficient of biofiltration using entrapped mixed microbial cells (EMMC) for industrial applications. This revised model describes fundamental mass transport processes among the air and solids/water phases, biodegradation of the substrate, CO2 production, and accumulation. Governing equations of the model are also verified by means of simplified examples with analytical solutions. Experimental data are also used to compare model predictions and experimental results in steady-state regimes. The kinetic constant 0.018 s(-1) and diffusivity coefficient 0.78 cm(2)/s evaluated based on our revised model are found to be fairly close to previously reported values (ca. 0.02-0.05 s(-1) and 0.81-1.02 cm(2)/s, respectively). In addition, our revised model shows that the optimum height/flow rate is 1.9 m/Lpm.