Autotrophic nitrogen removal at low temperature

J. R. Vázquez-Padín, I. Fernández, N. Morales, J. L. Campos, A. Mosquera-Corral, R. Méndez

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

In this work the autotrophic nitrogen removal was carried out at moderately low temperatures using two configurations: a) two-units one comprising a SHARON reactor coupled to an Anammox SBR and b) single-unit one consisting of a granular SBR performing the CANON process. At 20°C the two-units system was limited by the Anammox step and its nitrogen removal capacity was around ten times lower than the CANON system (0.08 g N/(L d) versus 1 g N/(L d)). When the CANON system was operated at 15°C the average removed nitrogen loading rate decreased to 0.2 g N/(L d). The CANON system was operated in order to limit the ammonia oxidation rate to avoid nitrite inhibition of Anammox bacteria. Since both, temperature and dissolved oxygen (DO) concentration regulate ammonia oxidizing bacteria activity, once the temperature of the reactor is decreased the DO concentration must be decreased to avoid the deeper oxygen penetration inside the granule which could cause inhibition of Anammox bacteria by oxygen and/or nitrite.

Original languageEnglish
Pages (from-to)1282-1288
Number of pages7
JournalWater Science and Technology
Volume63
Issue number6
DOIs
StatePublished - 2011
Externally publishedYes

Keywords

  • Aerobic granule
  • Ammonia oxidizing bacteria (AOB)
  • Anammox
  • CANON
  • SBR

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