Steady‐State Analysis for Biological Treatment of Inhibitory Substrates
Publication: Journal of Environmental Engineering
Volume 116, Issue 6
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, 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 For design purposes, the hydraulic residence time, is set equal to This restricts the mean cell residence time, to values higher than i.e., and maintains a reactor in the stable operating region at all times (based on steady‐state analysis). For phenol, a very biodegradable inhibitory substrate, the data indicate a log‐mean of 0.29 days, However, values of guaranteeing a less‐than‐1% chance that will be exceeded are in excess of one day.
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Copyright © 1990 ASCE.
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Published online: Oct 1, 1990
Published in print: Oct 1990
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