Ammonium-assimilating microbiome: A halophilic biosystem rationally optimized by carbon to nitrogen ratios with stable nitrogen conversion and microbial structure

Mengru Zhang, Fei Han, Zhe Liu, Yufei Han, Yuke Li, Weizhi Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The contradiction between theoretical metabolism of ammonium assimilation and experiential understanding of conventional biosystems makes the rational optimization of the ammonium-assimilating microbiome through carbon to nitrogen (C/N) ratios perplexing. The effect of different C/N ratios on ammonium-assimilating biosystems was investigated in saline wastewater treatment. C/N ratios significantly hindered the nutrient removal efficiency, but ammonium-assimilating biosystems maintained functional stability in nitrogen conversions and microbial communities. With sufficient biomass, higher than 86% ammonium and 73% phosphorus were removed when C/N ratios were higher than 25. Ammonium assimilation dominated the nitrogen metabolism in all biosystems even under relatively low C/N ratios, evidenced by the extremely low abundances of nitrification functional genes. Different C/N ratios did not significantly change the bacterial community structure of ammonium-assimilating biosystems. It is anticipated that the ammonium-assimilating biosystem with advantages of clear metabolic pathway and easy optimization can be applied to nutrient removal and recovery in saline environments.

Original languageEnglish
Article number126911
Number of pages11
JournalBioresource Technology
Volume350
DOIs
Publication statusPublished - 2022

Keywords

  • Ammonium assimilation
  • Ammonium-assimilating biosystems
  • Bacterial community
  • C/N ratios
  • Saline wastewater treatment

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