Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Influence of Free Nitrous Acid on Thiosulfate-Utilizing Autotrophic Denitrification

티오황산염을 이용한 황탈질과 Free Nitrous Acid의 영향

  • Ahn, Johwan (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Bae, Wookeun (Department of Civil and Environmental Engineering, Hanyang University)
  • 안조환 (한양대학교 건설환경공학과) ;
  • 배우근 (한양대학교 건설환경공학과)
  • Received : 2013.12.19
  • Accepted : 2014.03.25
  • Published : 2014.03.30
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Abstract

A sequencing batch reactor (SBR) was operated to obtain thiosulfate-utilizing denitrifier cultivated with two types of electron accepter (nitrate and nitrite). Using the microbial biomass obtained from the SBR, batch tests were conducted with different nitrite concentrations (50 and 100 mg-N/L) at pH 7.0, 7.5 and 7.9 to see how free nitrous acid (FNA) negatively works on the thiosulfate-utilizing denitrification of nitrate. The specific denitrification rate (SDR) of nitrate was significantly influenced by pH and FNA. The presence of nitrite caused a remarked decrease of the SDR under low pH conditions, because of the microbiological inhibitory effect of FNA. The minimum SDR was observed when initial nitrite concentration was 100 mg-N/L at pH 7.0. Moreover. the SDR was influenced by the type of electron acceptor used during the SBR operation. Thiosulfate-utilizing denitrifier cultivated with nitrite showed smaller SDR on the thiosulfate-utilizing denitrification of nitrate than those cultivated with nitrate.

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References

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