title: Parameters affecting the degradation of benzothiazoles and benzimidazoles in activated sludge systems.
abstract: It was found that benzothiazole, 2-oxybenzothiazole and 2-benzothiazolesulphonate were degraded in activated sludge systems. 2-Mercaptobenzothiazole (MBT) was more resistant, although the first step in MBT degradation seemed to be transformation to the sulphonate form. At higher MBT concentrations, it was transformed into a disulphide, which accumulated in the sludge. MBT was also found to be mainly responsible for the toxicity of rubber chemical waste-water towards activated sludges. It inhibited the degradation of the other heterocycles. Only at concentrations of around 20 ppm was MBT degraded. Mercaptobenzimidazole ranked second in resistance to degradation.
authors.affiliation: Catholic University of Leuven, Laboratory of Industrial Microbiology and Biochemistry, Heverlee, Belgium.
authors.forename: D
authors.initials: D
authors.lastname: De Vos
authors.forename: H
authors.initials: H
authors.lastname: De Wever
authors.forename: H
authors.initials: H
authors.lastname: Verachtert
mesh_terms: D001562:Benzimidazoles / Q000378:metabolism*; D052160:Benzothiazoles; D001673:Biodegradation, Environmental; D001709:Biotechnology; D002617:Chemical Industry; D010101:Oxygen Consumption; D012408:Rubber; D013844:Thiazoles / Q000378:metabolism*; D014865:Waste Disposal, Fluid
chemical_list: D001562:Benzimidazoles; D052160:Benzothiazoles; D013844:Thiazoles; D012408:Rubber; C005465:benzothiazole