4.8 Article

Changes in the nitrogen removal performance and the properties of granular sludge in an Anammox system under oxytetracycline (OTC) stress

Journal

BIORESOURCE TECHNOLOGY
Volume 129, Issue -, Pages 65-71

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.11.022

Keywords

Anammox; Oxytetracycline (OTC); Inhibition; Granule characteristics; Performance recovery

Funding

  1. National Natural Science Foundation of China [51078121, 51278162]
  2. National Key Technologies RD Program [2012BAC13B02]
  3. Program for Excellent Young Teachers in Hangzhou Normal University (HNUEYT) [JTAS 2011-01-020]

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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. (C) 2012 Elsevier Ltd. All rights reserved.

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