| Title |
Analysis of Nitrification by Aerated Multilayer Biofilm Developed on the Gas - permeable Membrane |
| Abstract |
A computer model was modified to describe a biofilm distributed on the gas permeable support. The biofilm was assumed to grow in the direction perpendicular to the support as two homogeneous layers. Derivation and development of the multilayer biofilm model was illustrated by describing mass balance equations on substrate concentrations within the biofilm and reactor bulk liquid. A numerical evaluation was implemented on a computer to obtain simultaneous numerical solution of applicable differential equations. The equations described mass balance on biomass and substrates under non-steady state conditions and provided an illustration to indicate the effect of parameter and reactor condition of autotrophic nitrifiers to overall biofilm reactions. Model behavior was discussed according to the performance of each biofilm layer. Spatial distribution of homogeneous microorganisms and substrates in the film were described in each condition of developed layer. The completely developed multilayer biofilm included inner and outer layer dominated by nitrosomonas and nitrobacter respectively. |