AI Article Synopsis
- The study investigated how oxytetracycline (OTC) affects the anaerobic ammonium oxidation (Anammox) process, finding that its inhibitory effects depend on the type of substrate, particularly nitrite.
- The half-maximal inhibitory concentration (IC50) for OTC was determined to be 517.5 mg L(-1), and a significant decrease in nitrogen removal rate was observed in a continuous-flow reactor after introducing 50 mg L(-1) OTC.
- The recovery of Anammox performance post-OTC inhibition was faster with a biocatalyst addition, and the modified Boltzmann model effectively simulated this recovery compared to other models; however, OTC exposure led to sludge hardening and poor settling properties of the
Article Abstract
The short- and long-term effects of oxytetracycline (OTC) on the anaerobic ammonium oxidation (Anammox) process were evaluated. The OTC inhibition of Anammox was substrate-, and especially nitrite-, dependent. The IC50 of OTC in the batch tests on an Anammox mixed culture was calculated to be 517.5 mg L(-1). The long-term effects of OTC on the Anammox process were examined in a continuous-flow upflow anaerobic sludge blanket reactor. Fifty milligrams per liter of OTC significantly decreased the nitrogen removal rate from 12.4 to 2 kg N m(-3) d(-1) within 26 days. The recovery of Anammox performance after OTC inhibition was accelerated by adding biocatalyst. In contrast to the modified Stover-Kincannon model, the modified Boltzmann model accurately simulated the recovery of Anammox performance. OTC presented in the influent led to sludge hardening and cell lysis. A poor settling property of Anammox sludge was also observed.
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| http://dx.doi.org/10.1016/j.biortech.2012.11.022 | DOI Listing |
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