Partial nitrification of wastewaters with high NaCl concentrations by aerobic granules in continuous-flow reactor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Chunli Wan
  • Xue Yang
  • Xiang Liu
  • Supu Sun
  • Chuan Chen


Original languageEnglish
Pages (from-to)1-6
Journal / PublicationBioresource Technology
Publication statusPublished - Jan 2014
Externally publishedYes


Wastewaters with high salinity are yielded that need sufficient treatment. This study applied aerobic granules to conduct partial nitrification reactions for wastewaters with high NaCl concentrations in a continuous-flow reactor. The present granules revealed partial nitrification performances at nitrite accumulation rate >95% and chemical oxygen demand (COD) removal at >85% at salt concentration up to 50g l-1. High salinity led to compact and tough granules. The granules applied electrogenic ion pump and sodium-calcium exchanger to reduce intracellular Na+ concentration; generated amino acids as osmoprotectants to resist the high osmotic pressure; produced excess extracellular polysaccharides and proteins with secretion of c-di-GMP; revised microbial community with halophilic strains. The present continuous-flow aerobic granule reactor (CFAGR) is a promising process to convert ammonium in highly saline wastewaters to nitrite, which can be applied with a subsequent Anammox process for efficient nitrogen removal. © 2013 Elsevier Ltd.

Research Area(s)

  • Aerobic granules, Continuous-flow reactor, Microbial community, NaCl, Osmoprotectants

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