Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on Enzyme-induced Carbonate Precipitation Technique for Soil Reinforcement without Releasing an Environmental Contaminant

환경 유해 부산물 누출이 없는 지반 보강용 효소 기반 탄산칼슘 침전 기법 연구

  • Lee, Seung-Hyung (Dept. of Civil and Environmental Engrg., Sejong Univ.) ;
  • Kim, Jong-Min (Dept. of Civil and Environmental Engrg., Sejong Univ.)
  • 이승형 (세종대학교 건설환경공학과) ;
  • 김종민 (세종대학교 건설환경공학과)
  • Received : 2021.04.09
  • Accepted : 2021.04.16
  • Published : 2021.04.30
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Abstract

Recently, the enzyme-induced carbonate precipitation (EICP) technique has been considered as one of the alternatives to the cement-based soil reinforcing method. However, the problem with the emission of ammonium ion has not been solved. In this study, an experimental study on the EICP without releasing an environmental contaminant (Ze-EICP) is performed using calcium-exchanged zeolite. The results show that the Ze-EICP using calcium-exchanged zeolite reduced the amount of ammonium ions by 96.96% and precipitated almost the same amount of calcium carbonate, compared to the EICP using calcium chloride. In addition, the Ze-EICP shows higher strength improvement rate than the EICP due to densification of zeolite and cementation of calcium carbonate.

최근 효소 기반 탄산칼슘 침전(EICP) 기법은 시멘트 기반 지반보강공법의 대안 중 하나로 간주되어 왔다. 하지만 EICP 기법에서 발생하는 환경 유해 부산물인 암모늄 이온의 배출에 대한 문제는 해결되지 않고 있다. 따라서 본 연구에서는 칼슘 치환 제올라이트를 사용하여 환경 유해 부산물이 없는 EICP(Ze-EICP)의 실험적 연구를 수행하고자 한다. 실험결과는 칼슘 치환 제올라이트를 사용하는 Ze-EICP가 염화칼슘을 사용하는 EICP와 비교하여 암모늄 이온은 96.96%가 제거되었으며, 거의 동일한 양의 탄산칼슘이 침전되었음을 보여주었다. 또한 Ze-EICP는 제올라이트의 조밀화와 탄산칼슘의 고결화로 인해 EICP 대비 높은 강도증진 효과를 보여주었다.

Keywords

References

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