Inhibition Kinetics During the Oxidation of Binary Mixtures of Phenol With Catechol, Resorcinol and Hydroquinone by Phenol Acclimated Activated Sludge

Abstract

-In this work the aerobic degradation of phenol (PH), catechol (CA), resorcinol (RE), hydroquinone (HY) and of the binary mixtures PH+CA, PH+RE, PH+HY by phenol-acclimated activated sludge was studied. Single substrate experiments show a Haldane-type dependence of the respiration rate on PH, RE and HY, while CA corresponded to the Monod model. Binary substrate experiments demonstrated that the presence of a second substrate only affected the kinetics, but not the stoichiometry of the oxidation of the compounds tested. While CA inhibited the oxidation of PH, PH inhibited the oxidation of RE and HY. A mathematical model was developed to represent the aerobic biodegradation of the phenolic compounds tested. The agreement between the proposed model and the experimental data indicates that the proposed model can be useful for predicting substrate and dissolved oxygen concentrations in bioreactors treating phenolic wastewaters.

Monitoring and modeling 4-chlorophenol biodegradation kinetics by phenol-acclimated activated sludge by using open respirometry

“…This technique is based on the measurement of the respiration rate of microorganisms under a controlled environment (Ros 1993). Respirometric techniques have been used to determine parameters of kinetic models that describe the aerobic biodegradation of wastewaters, single compounds, or mixtures of chemicals (Orhon et al 2009;Lobo et al 2013Lobo et al , 2014Lobo et al , 2016Sanchis et al 2014;Ferro Orozco et al 2016a, 2016b. These techniques were also employed to monitor the acclimation process of an activated sludge to a new environment (Aktas 2012;Ferro Orozco et al 2013).…”