Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Iron Extraction Characteristics of Sediment Samples from a River Bank Filtration Site

강변 여과 취수 지역 퇴적물의 철 화학종 추출 특성

  • Hyun, Sung Pil (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Moon, Hee Sun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Yoon, Pilsun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, BoA (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Ha, Kyoochul (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
  • 현성필 (한국지질자원연구원 지구환경연구본부) ;
  • 문희선 (한국지질자원연구원 지구환경연구본부) ;
  • 윤필선 (한국지질자원연구원 지구환경연구본부) ;
  • 김보아 (한국지질자원연구원 지구환경연구본부) ;
  • 하규철 (한국지질자원연구원 지구환경연구본부)
  • Received : 2013.06.10
  • Accepted : 2013.06.25
  • Published : 2013.06.30
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Abstract

River bank filtration has been considered as a promising alternative water management scheme, in which groundwater is extracted from an aquifer near a river after infiltration of the river water into the aquifer, thereby improving and maintaining the quality of water recovered. Iron (Fe) associated with sediment in contact with groundwater and infiltrating surface water is an important factor in determining the quality of water recovered from the pumping wells in river bank filtration. This study reports the results of Fe speciation in the aquifer sediment samples collected from different depths at the river bank filtration site in Changwon, studied using four different chemical extraction methods, namely, ferrozine, oxalate, HCl, and DCB methods. Overall, the results show that Fe(II) as well as the total Fe content decreases with depth down to ~20 m and then increases further below. This trend is consistent with the redox characteristics suggested by visual observation. The silt/clay size fraction (${\phi}$ < 62.5 ${\mu}M$) has up to 2~10 times more Fe compared with the sand size fraction (62.5 ${\mu}M$ < ${\phi}$ < 2 mm), depending on the extraction method. Of the four extraction methods, DCB solution extracted the most Fe from the sediment samples. The amounts of Fe extracted by the different extraction methods can be a good indicator of the redox conditions along the depth of the aquifer.

최근 들어 안정된 수자원 확보를 위해 하천수를 강변의 충적층을 통과시켜 취수하는 강변 여과수 개발이 각광을 받고 있다. 지표수 및 지하수와 반응하는 주변 충적층 퇴적물에 존재하는 철은 강변 여과 후 양수정을 통해 얻어지는 지하수의 수질을 결정하는 데 매우 중요한 요소이다. 본 연구에서는 퇴적물-지하수-지표수의 상호 작용에 의한 철 화학종의 존재 변화를 알아보기 위해 창원시 대산면 낙동강변의 강변여과 부지에서 채취한 대수층 퇴적물 내에 존재하는 철 함유량을 퇴적물 심도 및 입자 크기에 따라 다양한 화학적 철 추출법을 통해 비교하였다. 실험 결과는 전체적으로 지표로부터 20 m 부근까지는 2가철 및 총 철 함량이 전체적으로 감소하다 20 m 깊이 이하에서는 증가하는 경향을 나타내었다. 이러한 결과는 육안으로 관찰되는 퇴적물 색깔이 지시하는 산화/환원 환경 특성과도 일치하였다. 한편, 퇴적물의 모래 부분보다 미사/점토 부분에서 추출법에 따라 2~10배의 철이 추출되었다. 그리고, 다양한 추출법 중 DCB 용액에 의해 가장 많은 철이 추출되었다. 이와 같은 다양한 철 분석법으로 추출되는 철 함량 특성은 퇴적물 내에서 철의 용해 및 침전을 결정짓는 심도에 따른 산화/환원 조건의 좋은 지시자로 활용될 수 있을 것으로 판단된다.

Keywords

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  2. Evaluating Effects of Membrane Filter Pore Sizes on Determination of Dissolved Concentrations of Major Elements in Groundwater and Surface Water Near Nakdong River vol.20, pp.4, 2015, https://doi.org/10.7857/JSGE.2015.20.4.031
  3. Spatiotemporal evolution of iron and sulfate concentrations during riverbank filtration: Field observations and reactive transport modeling vol.234, pp.None, 2013, https://doi.org/10.1016/j.jconhyd.2020.103697