The effect of salinity on nitrite accumulation in a down-flow hanging sponge reactor

T. Natori, Y. Takemura, Hideki Harada, K. Abe, A. Ohashi, M. Kimura, T. Yamaguchi, T. Okubo, S. Uemura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background: In this study, the inductive effect of salinity on nitrite accumulation in a down-flow hanging sponge (DHS) reactor, developed as a novel and cost-effective wastewater treatment process, was evaluated by conducting a long-term continuous experiment lasting more than 1400 days. Results: The influent salinity was controlled by adding NaCl at concentrations ranging from 0 to 25 g Cl - L -1. The effluent nitrite increased with increases in salinity, i.e. the fraction of nitrite to total nitrogen in the effluent increased from 1.6% at 0 g Cl - L -1 to 87.6% at 25 g Cl - L -1. Fluorescence in situ hybridization (FISH) analysis revealed that as salinity increased, the nitrifying bacterial community in the DHS changed markedly at the species level. In particular, the dominant nitrite-oxidizing bacteria changed from Nitrospira-sublineage I at 0 g Cl - L -1 to Nitrobacter spp. at 15 g Cl - L -1. At 25 g Cl - L -1, no nitrite-oxidizing bacteria were detected. Conclusion: Our findings suggest that the DHS reactor is suitable for cost-effective nitrite production processes and that salinity control using NaCl is an effective method for inducing nitrite accumulation.

Original languageEnglish
Pages (from-to)1466-1472
Number of pages7
JournalJournal of Chemical Technology and Biotechnology
Volume87
Issue number10
DOIs
Publication statusPublished - 2012 Oct 1

Keywords

  • Ammonia-oxidizing bacteria
  • Down-flow hanging sponge reactor
  • Fluorescence in situ hybridization
  • Nitrite accumulation
  • Nitrite-oxidizing bacteria
  • Salinity

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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  • Cite this

    Natori, T., Takemura, Y., Harada, H., Abe, K., Ohashi, A., Kimura, M., Yamaguchi, T., Okubo, T., & Uemura, S. (2012). The effect of salinity on nitrite accumulation in a down-flow hanging sponge reactor. Journal of Chemical Technology and Biotechnology, 87(10), 1466-1472. https://doi.org/10.1002/jctb.3770