유리 비드 및 자연 토양으로 충진한 컬럼 내에서 5가 비소의 이동도에 미치는 미생물과 철 나노입자의 영향
Effects of Microorganism and Fe-Nanoparticles on Mobility of Arsenate in Columns Filled with Glass Beads or Natural Soil
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지중에서 As(V)의 이동도에 미치는 미생물과 철 나노입자의 영향을 파악하기 위하여, 유리 비드 및 비소로 오염된 자연 토양으로 충진한 컬럼에 As(V) 용액을 통과시키며 각 컬럼에 미생물, akaganeite 나노입자, 미생물과 나 노입자 혼합물을 주입하였다. 유리 비드를 이용한 7일 간의 실험 결과, 나노입자를 주입한 유출수(0.48 mg/L)에서 비 교실험(0.17 mg/L)에 비하여 높은 비소 농도를 보였다. 미생물(0.04 mg/L) 및 혼합물(0.08 mg/L)을 주입한 경우는 비 교실험에 비하여 낮은 As 농도를 나타내었다. 이와 대조적으로 자연 토양으로 충진한 컬럼에 미생물을 주입한 결과, 비소가 매우 높은 함량(1.39 mg/L)으로 유출되었으며, 나노입자를 주입한 경우(0.28 mg/L)는 비교실험(0.18 mg/L)과 큰 차이가 없었다. 유리 비드와 자연 토양에서 나타나는 이러한 상이한 결과는 미생물 및 나노입자와 반응하는 As(V) 의 거동이 오염된 지질학적 매질의 종류, 즉 결정질암 대수층 또는 토양 여부에 의해 좌우될 수 있음을 나타낸다.
Abstract
The effects of microorganism, akaganeite nanoparticles, and a mixture of both on the mobility of dissolved As(V) were investigated through experiments using columns filled with glass beads or natural, As-contaminated soil. In the case of glass beads column, nanoparticles enhanced the concentration of dissolved As in the effluent (0.48 mg/L) when compared with a control (0.17 mg/L) after 7 days. In microbial (0.04 mg/L) and mixture columns (0.08 mg/L), dissolved As concentrations were lower than the control. However, injection of microbe into the column filled with natural soil led to highly enhanced extraction of As from the soil (1.39 mg/L), whereas no significant difference in the amount of dissolved As was observed between nanoparticles (0.28 mg/L) and control (0.18 mg/L) columns. The results indicated that the interaction of As(V) with microorganism and Fe-nanoparticles may be controlled by the kind of geological media, i.e., crystalline aquifer or soil, contaminated with As(V).
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