Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Study on Autotrophic Denitrification by the Injection of Spent Sulfidic Caustic in a Hybrid Bardenpho Process

Hybrid Bardenpho 공정에서 Spent Sulfidic Caustic의 주입을 통한 독립영양 탈질에 관한 연구

  • Lee, Jae-Ho (School of Civil and Environmental Engineering, Pusan National University) ;
  • Park, So-Ra (School of Civil and Environmental Engineering, Pusan National University) ;
  • Park, Jeung-Jin (School of Civil and Environmental Engineering, Pusan National University) ;
  • Byun, Im-Gyu (School of Civil and Environmental Engineering, Pusan National University) ;
  • Park, Tae-Joo (School of Civil and Environmental Engineering, Pusan National University)
  • 이재호 (부산대학교 사회환경시스템공학부) ;
  • 박소라 (부산대학교 사회환경시스템공학부) ;
  • 박정진 (부산대학교 사회환경시스템공학부) ;
  • 변임규 (부산대학교 사회환경시스템공학부) ;
  • 박태주 (부산대학교 사회환경시스템공학부)
  • Received : 2008.06.09
  • Accepted : 2008.08.14
  • Published : 2008.09.30
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Abstract

In petroleum refining industry, caustic (NaOH) solution is used to remove $H_2S$ from hydrocarbon streams in naphtha cracking process. Once $H_2S$ is absorbed in caustic solution, the solution becomes known as spent sulfidic caustic (SSC), which contains high concentrations of hydrogen sulfide and alkalinity. This study was focused on the evaluation of autotrophic denitrification by SSC in a hybrid Bardenpho process. SSC was injected to the anoxic (1) and anoxic (2) tank at different S/N ratio. In a previous lab-scale study, as we operated a modified Ludzack-Ettinger process, it was observed that the COD increment of effluent and nitrification failure happened because of non-biodegradable matters in SSC and high pH, respectively. Thus cilia media was packed at 2.4%(v/v) in all aerobic tanks and the pH of SSC was neutralized from 13.3 to 11.5 with addition of sulphuric acid ($H_2SO_4$). Consequently, these strategies were successful because no COD increment of effluent was observed and nitrification failure did not happen. The maximum TN removal efficiency was 77.5% when SSC was injected to both the anoxic (1) and anoxic (2) tanks. The mean TN concentration of effluent in this condition was 5.8 mg/L.

Keywords

Acknowledgement

Supported by : 한국환경기술진흥원

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