Abstract：
:This work assessed the effect of the antibiotics trimethoprim (TMP) and sulfamethoxazole (SMX) on the granulation process, microbiology, and organic matter and nutrient removal of an aerobic granular sludge (AGS) system. In addition, after the maturation stage, the impact of the redox mediator anthraquinone-2,6-disulfonate (AQDS) (25 μM) on the biotransformation of the antibiotics was evaluated. The reactor R1 was maintained as a control, and the reactor R2 was supplemented with TMP and SMX (200 μg L-1). The ability to remove C, N, and P was similar between the reactors. However, the structural integrity of the AGS was impaired by the antibiotics. Low TMP (∼30%) and SMX (∼60%) removals were achieved when compared to anaerobic or floccular biomass aerobic systems. However, when the system was supplemented with AQDS, an increase in the removal of TMP (∼75%) and SMX (∼95%) was observed, possibly due to the catalytic action of the redox mediator on cometabolic processes. Regarding the microbial groups, whereas Proteobacteria and Bacterioidetes increased, Planctomycetes decreased in both reactors. However, TMP and SMX presence seemed to inhibit or favor some genera during the formation of the granules, possibly due to their bactericidal action.
journal_name
Chemospherejournal_title
Chemosphereauthors
Mendes Barros AR,Argenta TS,de Amorim de Carvalho C,da Silva Oliveira F,Milen Firmino PI,Bezerra Dos Santos Adoi
10.1016/j.chemosphere.2020.127840subject
Has Abstractpub_date
2021-01-01 00:00:00pages
127840eissn
0045-6535issn
1879-1298pii
S0045-6535(20)32035-Xjournal_volume
262pub_type
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