Startup and performance of a novel single-stage partial nitritation/anammox system for reject water treatment

Yunzhi Qian, Yanmei Ding, Huaji Ma, Yongzhi Chi, Hongying Yuan, Yu You Li, Sufeng Tian, Bowen Zhang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


A novel internal circulation contact oxidation membrane bioreactor (ICCOMBR) was constructed to investigate a three steps startup strategy of single-stage partial nitritation-anammox (SPNA) system. A stable nitrite accumulation rate (NAR) of 86.60% was achieved with NH4+-N over 250 mg/L in nitritation process. The partial nitritation process could be effectively achieved by reducing the aeration rate (AR) by about 50% in the nitritation process, with an effluent NO2-N/NH4+-N ratio of 1.15 ± 0.04. The SPNA system was started up in 27 days following the inoculated anammox granular sludge. A total nitrogen removal efficiencies of 82% was achieved at a NLR of 0.60 gN/L/d and dissolved oxygen (DO) concentration below 0.55 mg/L. Anammox function genus (Ca.Kuenenia and Ca. Anammoximicrobium) abundance accounted for 20.77% in the biofilm, which is approximately equal to 22.2% in the suspended sludge. Nitrosomon as the dominant AOB genera, was detected in the biofilm (6.5%) and suspended sludge (13.3%).

Original languageEnglish
Article number124432
JournalBioresource Technology
Publication statusPublished - 2021 Feb
Externally publishedYes


  • Biofilm carriers
  • Microbial community
  • Partial nitritation
  • Reject water
  • Single-stage partial nitritation-anammox

ASJC Scopus subject areas

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


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