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Batch experiments were conducted to investigate the effect of oxytetracycline on anaerobic ammonium oxidation (anammox) process. The short-and long-term effects on anammox activity were studied by measuring ammonium, nitrite, and nitrate concentrations over time. Experiments were conducted
at ammonium and nitrite concentrations of 60–90 mg N/L and 60–190 mg N/L, respectively (ammonium:nitrite ratio from 1:1–1:2.25), oxytetracycline concentrations of 23–100 mg/L, and biomass concentrations of 300–800 mg/L. In the short-term study, anammox activity
was inhibited by all oxytetracycline concentrations studied. However, daily addition of oxytetracycline to a concentration of 5±3.5 mg/L in the anammox sequencing batch reactor completely inhibited anammox activity in the fifth week. Fluorescent in situ hybridization was used to identify
autotrophic ammonium oxidizing bacteria (Nitrosomonas spp., Nitrobacter spp., Nitrospira spp., Candidatus Brocadia anammoxidans, and Candidatus Kuenenia stuttgartiensis). The population of anammox culture was significantly decreased while Nitrosomonas
spp. and Nitrospira spp. increased in the fifth week compared with the first week of experiment. A not-competitive model fit the anammmox inhibition data at oxytetracycline concentrations of 0–100 mg/L quite well with Vmax of 0.0435 mg N/mg VSS-hr and Ki
of 54.66 mg/L.
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