Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Removal of Cs and Sr in Water Using Chemical and Natural Coagulants

화학 및 천연 응집제를 이용한 수중 Cs, Sr 제거

  • Kim, Seongbeom (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Kim, Youngsug (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kang, Sungwon (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Oh, Daemin (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Wontae (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • Received : 2016.11.07
  • Accepted : 2016.12.02
  • Published : 2016.12.31
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Abstract

This study investigated removal of radionuclides (Cs, Sr) in surface water by coagulation and precipitation. Jar tests were conducted with various chemical and natural coagulants to remove the stabilized radionuclides ($^{133}Cs$, $^{88}Sr$). Chemical coagulants included aluminum sulfate, poly aluminum chloride, and poly aluminum hydroxide chloride silicate (PACS); natural coagulants (minerals) included illite and zeolite. Chemical coagulant alone could achieve removals of Cs and Sr less than 10%; The removals increased up to 23.1% for Cs and 17.8% for Sr with addition of poly-dimethyldiallylammonium chloride (polyDADMAC) along with the chemical coagulants. Compared with chemical coagulants, natural coagulants (minerals) could achieve higher removals of Cs and Sr. Addition of zeolite along with PACS and polyDADMAC increased the removal rates up to 36.9% for Cs and 17.1% for Sr.

응집/침전 기술로 지표수 내 방사성 핵종(Cs, Sr)의 제거 가능성을 평가하였다. 화학응집제는 Alum (aluminum sulfate), PAC (poly aluminum chloride), PACS (poly aluminum hydroxide chloride silicate)를 사용하였고, 광물계 천연응집제는 일라이트(illite)와 제올라이트(zeolite)를 사용하였다. 화학 및 천연 응집제는 각각 주입하거나 혼합 주입한 후 jar-test를 통하여 안정화된 방사성 핵종($^{133}Cs$, $^{88}Sr$)의 제거율을 평가하였다. 응집/침전 공정에서 화학응집제(Alum, PAC, PACS) 주입만으로는 Cs과 Sr이 10% 미만으로 제거되었고, 고분자응집제(polyDADMAC)를 혼합하여 주입할 경우 Cs은 최대 23.1%, Sr은 최대 17.8%까지 제거가 가능하였다. 광물계 천연응집제(zeolite, illite)는 화학응집제(Alum, PAC, PACS)에 비하여 Cs과 Sr의 제거율이 높았는데, 화학응집제(PACS)와 고분자응집제에 zeolite를 추가로 주입(10~200 mg/L)한 경우 Cs 제거율은 최대 36.9%, Sr 제거율은 최대 17.1%로 증가하였다.

Keywords

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