A NOTE ON BENZOTRIAZOLE CONCENTRATIONS IN THE RECEIVING WATERS OF DIFFERENT SEWAGE TREATMENT PLANTS
Journal: Asian Pacific Journal of Microbiology Research (AJMR)
Author: Bastian Herzog, Elisabeth Müller, Hilde Lemmer, Harald Horn
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
The concentrations of Benzotriazole (BTri), 4- and 5-methyl-benzotriazole (4-TTri, 5-TTri) were analyzed in the receiving river of a membrane bioreactor (MBR-MH), a conventional activated sludge (CAS-E) and a two-stage conventional activated sludge (CAS-M) sewage treatment plant (STP). All STPs were point sources for benzotriazoles in the aquatic environment as concentrations downstream the STPs were higher. Mean downstream concentrations ranged from 3.58 µg L -1 (MBR-MH) to 1.1 µg L -1 (CAS- M) and 0.64 µg L -1 (CAS-E). CAS-E only slightly increased downstream concentrations as the receiving river was already contaminated with up to 0.49 µg L -1 benzotriazoles from hydropower. 5-TTri was detected in lowest concentrations due to its good biodegradation, followed by BTri and 4-TTri. The latter two showed a potential to accumulate in the aquatic environment as they are only poorly biodegraded. Although the STPs were a point source for BTs into the aquatic environment, their impact strongly depended on the upstream water quality and the self-purification potential of the receiving river system..