Aerobic biodegradation kinetics for 1,4-dioxane under metabolic and cometabolic conditions

Journal of Hazardous Materials
Francisco J Barajas-Rodriguez, David L Freedman

Abstract

Biodegradation of 1,4-dioxane has been studied extensively, however, there is insufficient information on the kinetic characteristics of cometabolism by propanotrophs and a lack of systematic comparisons to metabolic biodegradation. To fill in these gaps, experiments were performed with suspended growth cultures to determine 16 Monod kinetic coefficients that describe metabolic consumption of 1,4-dioxane by Pseudonocardia dioxanivorans CB1190 and cometabolism by the propanotrophic mixed culture ENV487 and the propanotroph Rhodococcus ruber ENV425. Maximum specific growth rates were highest for ENV425, followed by ENV487 and CB1190. Half saturation constants for 1,4-dioxane for the propanotrophs were one-half to one-quarter those for CB1190. Propane was preferentially degraded over 1,4-dioxane, but the reverse did not occur. A kinetic model was used to simulate batch biodegradation of 1,4-dioxane. Propanotrophs decreased 1,4-dioxane from 1000 to 1 μg/L in less time than CB1190 when the initial biomass concentration was 0.74 mg COD/L; metabolic biodegradation was favored at higher initial biomass concentrations and higher initial 1,4-dioxane concentrations. 1,4-Dioxane biodegradation was inhibited when oxygen was below 1.5 mg/L. ...Continue Reading

Citations

May 30, 2020·Biodegradation·Marcio Luis Busi da SilvaPedro J J Alvarez
Jun 4, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Ramesh AryalJia Liu
Jul 30, 2020·The Science of the Total Environment·Reid SimmerJerald L Schnoor
Apr 19, 2021·Ecotoxicology and Environmental Safety·Peng WangMengyan Li

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