Long term evaluation of the effect of salinity on organic removal and ammonium oxidation in a down-flow hanging sponge reactor

S. Uemura, M. Kimura, T. Yamaguchi, A. Ohashi, Y. Takemura, H. Harada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The effect of salinity on organic removal and ammonium oxidation in a down-flow hanging sponge reactor was investigated by conducting a long-term continuous experiment over a period of 800 days. The DHS reactor, constructed by connecting three identical units, was fed with artificial wastewater containing 500 mg-N/L of ammonium nitrogen and 1400 mg- COD/L of phenol. Salinity of the influent was controlled by the addition of 8.0 to 25 g-Cl -/L of NaCl. The DHS reactor was operated at a hydraulic retention time of 12 h in a temperature controlled room at 25oC. No significant inhibition of organic removal and ammonium oxidation was observed at salinities of up to 20 g-Cl-/L, at which levels ammonium oxidation and COD removal both exceeded 90%, respectively. However, at a salinity of 25 g-Cl -/L, organic removal and ammonium oxidation were both severely inhibited. In addition, the ratio of effluent nitrite nitrogen to influent ammonium nitrogen increased from 3.4% at salinities of 8.0 g-Cl -/L to 33% at salinities of 20 g-Cl -/L.

Original languageEnglish
Pages (from-to)361-366
Number of pages6
JournalInternational Journal of Environmental Research
Volume6
Issue number2
Publication statusPublished - 2012 Apr

Keywords

  • Ammonium oxidation
  • DHS
  • Nitritation
  • Phenol
  • Salinity

ASJC Scopus subject areas

  • Environmental Science(all)

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