Abstract
A steady‐state approach for designing biological wastewater treatment systems is developed for inhibitory substrates using the Haldane rate expression. Steady‐state solutions are derived for a continuous‐flow completely mixed reactor with recycle of the biomass. It is determined that two steady‐state operating regions exist at any one mean cell residence time; an unstable region, where the substrate concentration increases and the biomass concentration decreases as the mean cell residence time increases, and a stable region, where the substrate concentration decreases and the biomass concentration increases with mean cell residence time. A critical mean cell residence time, θc*, is established as a design parameter, for inhibitory substrates, to maintain a biological reactor in the stable operating region. A survey of published data for phenol exhibits an excellent logprobability relationship for θc*. For design purposes, the hydraulic residence time, θh, is set equal to θc*, This restricts the mean cell ...
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