한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제29권6호
  • /
  • Pages.777-781
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  • 2013
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  • 2289-0971(pISSN)
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  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
권호 표지

질산성질소에 파과된 이온교환수지의 생물학적 직접 재생

Direct Bio-regeneration of Nitrate-laden Ion-exchange Resin

  • Nam, Youn-Woo (Department of Environment Engineering, Daejeon University) ;
  • Bae, Byung-Uk (Department of Environment Engineering, Daejeon University)
  • 투고 : 2013.09.23
  • 심사 : 2013.11.07
  • 발행 : 2013.11.30
⟨ 이전 논문 다음 논문 ⟩

초록

Ion-exchange technology is one of the best for removing nitrate from drinking water. However, problems related to the disposal of spent brine from regeneration of exhausted resins must be overcome so that ion exchange can be applied more widely and economically, especially in small communities. In this background, a combined bio-regeneration and ion-exchange system was operated in order to prove that nitrate-laden resins could be bio-regenerated through direct contact with denitrifying bacteria. A nitrate-selective A520E resin was successfully regenerated by denitrifying bacteria. The bio-regeneration efficiency of nitrate-laden resins increased with the amount of flow passed through the ion-exchange column. When the fully exhausted resin was bio-regenerated for 5 days at the flowrate of 30 BV/hr and MLSS concentration of $125{\pm}25mg/L$, 97.5% of ion-exchange capacity was recovered. Measurement of nitrate concentrations in the column effluents also revealed that less than 5% of nitrate was eluted from the resin during 5 days of bio-regeneration. This result indicates that the main mechanism of bio-regeneration is the direct reduction of nitrate by denitrifying bacteria on the resin.

키워드

과제정보

연구 과제 주관 기관 : 중소기업청

참고문헌

  1. Bae, B. U., Kim, C. H., and Kim, Y. I. (2004). Treatment of Spent Brine from a Nitrate Exchange Process Using Combined Biological Denitrification and Sulfate Precipitation, Water Science and Technology, 49(5-6), pp. 413-419.
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