Nitrogen removal performance and loading capacity of a novel single-stage nitritation-anammox system with syntrophic micro-granules

Shaopo Wang, Yuan Liu, Qigui Niu, Jiayuan Ji, Toshimasa Hojo, Yu You Li

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The operation performance of a novel micro-granule based syntrophic system of nitritation and anammox was studied by controlling the oxygen concentration and maintaining a constant temperature of 25 °C. With the oxygen concentration of around 0.11 (<0.15) mg/L, the single-stage nitritation-anammox system was startup successfully at a nitrogen loading rate (NLR) of 1.5 kgN/m3/d. The reactor was successfully operated at volumetric N loadings ranging from 0.5 to 2.5 kgN/m3/d with a high nitrogen removal of 82%. The microbial community was composed by ammonia oxidizing bacteria (AOB) and anammox bacteria forming micro-granules with an average diameter of 0.8 mm and good settleability. Results from pyrosequencing analysis revealed that Ca. Kuenenia and Nitrosomonas were selected and enriched in the community over the startup period, and these were identified as the dominant anammox bacteria and AOB species, respectively.

Original languageEnglish
Pages (from-to)119-128
Number of pages10
JournalBioresource Technology
Volume236
DOIs
Publication statusPublished - 2017

Keywords

  • Ca. Kuenenia
  • Nitrogen loading rate
  • Nitrogen removal
  • Single-stage nitritation-anammox
  • Syntrophic micro-granule

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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