Salinity-driven heterogeneity toward anammox distribution and growth kinetics

Zhuoying Wu, Han Meng, Xiaowu Huang, Qian Wang, Wen Hsing Chen, Ji Dong Gu, Po Heng Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Anaerobic ammonium oxidation (anammox) has been widely applied for biological nitrogen removal in freshwater systems, and there is a potential for its extension in saline water systems. In this study, the abundance and biodiversity of anammox bacteria were investigated in both saline and freshwater full-scale sewage treatment plants (STPs). The anammox bacteria were widely found in four tested STPs with abundance of 10 5 –10 7 copies per mL of 16S rRNA gene. Phylogenetic results showed that Ca. Scalindua and Ca. Brocadia dominated in saline and freshwater STPs, respectively. Ca. Kuenenia dominated in one of freshwater STPs. However, redundancy discriminate analysis (RDA) indicates the distribution of Ca. Kuenenia in both saline and freshwater conditions. To further elucidate these observations, the Monod model was integrated with Gauss equation for the evaluation of salinity-induced kinetics. Model results reveal that when nitrite concentration (S NO2 ) is higher than nitrite affinity constant (K NO2 ), salinity (over ~ 3.0%) is responsible for Candidatus Scalindua dominance over Candidatus Kuenenia. Conversely, in nitrite-depleted conditions (K NO2 ≥ S NO2 ), high nitrite affinity leads to the predominance of Ca. Scalindua in all salinities. This study provides fundamental insights into saline anammox applications.

Original languageEnglish
Pages (from-to)1953-1960
Number of pages8
JournalApplied Microbiology and Biotechnology
Issue number4
StatePublished - 15 Feb 2019
Externally publishedYes


  • Anammox
  • Ca. Kuenenia
  • Ca. Scalindua
  • Kinetic modeling
  • Salinity


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