The influence of macromixing on organic carbon uptake by aerobic suspended biomass has been investigated using two reactors operated in parallel, i.e. a perfectly mixed reactor and a compartmented reactor. Conversion determined on filtrated samples is identical in both of the reactors but with less solids production in the low-dispersed reactor. The reaction rate established on the perfectly mixed reactor shows an apparent first-order with influence of inlet concentration but this relation cannot be used in a mass balance over the compartmented reactor.

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