Show transcribed image text Consider disinfectant penetrates into the biofilm by diffusion and react with the biofilm according to first order kinetics throughout the entire biofilm with a reaction rate constant Ka. Diffusion of disinfectant into the biofilm is DA Define two differential elements for this system Choose a differential element that helps to calculate flux from liquid to biofilm. Apply mass balance to get the following differential equation. Simplify this mass balance to get the following differential equation 1) 2) 3) dz2 4) 5) 6) Indicate boundary conditions Compare the flux in the liquid film and flux in the biofilm Now, if the disinfectant is somehow injected into the biofilm at some velocity v, write the mass balance if disinfectant for a control volume in the bioflm. List necessary assumptions. Hint (To start problem) ac a ay