개도국 내 자연적 비소오염 지하수의 정화를 위한 새로운 흡착제 평가 - 경제성, 취득용이성, 효율성을 중심으로
Assessment of Adsorbent Candidates for Treatment of Groundwater Contaminated with Geogenic Arsenic in Developing Countries – Based on Cost, Availability, and Effectiveness
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초록
이 연구에서는 기존의 As 여과장치에 적용된 흡착제보다 상대적으로 저렴하고 확보가 용이한 물질을 조사 하고자 하였으며, 이 중 커피찌꺼기, 황토, 레드머드, 볏짚의 이용 가능성을 확인하였다. As(III) 주입 실험에서 커피찌 꺼기 11.7%, 황토 40.0%, 레드머드 70.8%, 볏짚 12.6%의 총 As 제거효율을 보였으며, As(V) 주입 실험에서는 커피찌 꺼기 10.7%, 황토 82.3%, 레드머드 80.6%, 볏짚 19.7%의 총 As 제거효율을 나타내었다. 용액 내 As 제거효율 측면에 서 황토와 레드머드가 높은 현지 적용 가능성을 보였으며, 추가적으로 커피찌꺼기는 높은 As(III) 산화능을 보여 보조 흡착제 역할을 수행할 수 있을 것으로 판단되었다. 그러나 커피찌꺼기의 낮은 제거효율, 현지 토양의 광물학적 ‧ 지구 화학적 특성 파악, 레드머드의 강알칼리성 등은 이들 물질을 이용하기 위해 극복해야 할 필수과제이며, 따라서 각 물 질이 지닌 문제점 해결을 위한 다양한 선행연구가 수행되어야 할 것이다.
Abstract
The purpose of this study was to investigate the adsorbents of lower cost and easier availability than the conventional As adsorbents and to verify its applicability. Coffee waste, red-yellow soil, red mud and rice straw were used as adsorbents in As(III) input experiment, and the removal efficiencies of total As were 11.7%, 40.0%, 70.8% and 12.6%, respectively. Results of As(V) input experiment showed that the removal efficiencies of total As were 10.7%, 82.3% 80.6% and 19.7%, respectively. Red-yellow soil and red mud can serve as adsorbent candidates of As treatment in terms of the removal efficiency. Coffee waste may be considered as a co-adsorbent of As(III) removal due to its high capacity of As(III) oxidation. However, disadvantages such as the low removal efficiency, the need of mineralogical and geochemical characterization of on-site red-yellow soil, and the strong alkalinity of red mud should be solved through precedent studies for on-site application.
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