Denitrification of Nitric Oxide Using Hollow Fiber Membrane Bioreactor; Effect of Nitrate and Nitric Oxide Loadings on the Reactor Performance and Microbiology

Vahid Razaviarani, Melany Ruiz-Urigüen, Peter R. Jaffe

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Nitric oxide (NO) removal from a gas stream containing ~500 ppm NO was studied in a hollow fiber membrane (HFM) bioreactor. Compared to other biological NO removal methods the HFM bioreactor achieved NO removal rates that were as good if not better, of up to 92% NO removal, under comparable loadings and reactor size. Results showed that a wastewater stream containing organic carbon can be used as the electron donor to reduce the NO. Hence, combining biological NO treatment with treatment of a wastewater containing organic carbon has may be an effective overall cost-reducing strategy. The effect of different nitrate (NO3) concentrations on the NO reduction rate was also evaluated, and results showed that NO3 does enhance the NO removal rate. The reactor’s performance was studied under six different NO:NO3 loading regimes and the NO removal rate as well as the microbial denitrifier community in the reactor was tracked. Specifically, the relevant genes responsible for each denitrification step were tracked during each different NO:NO3 loading regime to the reactor. Results showed that the denitrifying microbial community adjust rapidly to changes in the different N loadings, but overall the performance of the reactor is robust and can withstand such variability in terms of NO, NO3 and organic carbon removal.

Original languageEnglish (US)
Pages (from-to)1989-2000
Number of pages12
JournalWaste and Biomass Valorization
Volume10
Issue number7
DOIs
StatePublished - Jul 1 2019

All Science Journal Classification (ASJC) codes

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

Keywords

  • Denitrification
  • Electron acceptor
  • Hollow fiber membrane
  • Microbial community
  • Nitric oxide (NO)
  • Waste treatment

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