Effects of Substitutions on the Biodegradation Potential of Benzotriazole Derivatives

2nd International Conference on Advanced Materials

Abu-Dalo, M.A.^1 ; O'Brien, I.^2 ; Hernandez, M.T.^3

Jordan University of Science and Technology, Faculty of Science and Arts, Chemistry Department, P.O.Box 3030, Irbid

22110, Jordan^1

Air Force Civil Engineer Center (AFCEC), San Antonio

TX, United States^2

Department of Civil and Environmental Engineering, University of Colorado at Boulder, Campus Box 428, Boulder

CO 80309-0428, United States^3

关键词: Activated sludge;    Aircraft de-icing fluid;    Benzotriazole derivative;    Biodegradation patterns;    Biodegradation potentials;    Enrichment culture;    Microbial consortia;    Short time frames;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/305/1/012020/pdf
DOI  :  10.1088/1757-899X/305/1/012020

来源: IOP

【 摘 要 】

Fourteen benzotriazole derivatives were subjected to microcosm tests to study the influence of substitutions on their biodegradation potential. Methylated, nitrated, carboxylated, and propionated bezotriazoles, a heterocyclic triazole, as well as methylated benzimidazoles, were introduced to activated sludge and soil enrichment cultures as the only carbon source. Some of the enrichment cultures were derived from airport soils that had been previously contaminated with aircraft deicing fluids and subsequently enriched with the commercially significant corrosion inhibitor methylbenzotriazole. The 5-methylbenzotriazole and only the carboxylated derivatives were degraded by soil or activated sludge biomass regardless of acclimation conditions. Radiotracer studies of [U-14C] 5-methylbenzotriazole, and [U-14C] 5-carboxybenzotriazole confirmed that relatively high concentrations (25mg L-1) of these derivatives can be completely mineralized in relatively short time frames by microbial consortia regardless of prior exposure. Observations suggested that the growth yield on these compounds is likely low. Biodegradation patterns suggested that carboxylated benzotriazole derivatives are more readily biodegradable than their more popular methylated counterparts.