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지하수 공의 Fe 스케일에 대한 중금속원소 함량과 철산화박테리아의 지구화학적 특성 연구

Geochemical Characteristics of the Heavy Metal Content and the Iron-oxidation Bacteria for Fe Scales in Groundwater Well

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주제분류자원공학

초록

조선대학교 지하수 공에 형성된 Fe scale에 대한 지구화학적 특징을 연구하였다. Fe 스케일을 구성하는 주요 성분은 Fe2O3와 SiO2이며, Fe2O3의 함량범위는 8.77 wt.%에서 79.1 wt.%이고, SiO2 함량범위는 4.43 wt.%에서 61.1 wt.%로 나타났다. 중금속원소인 Cr(최대 94,400 mg/kg), Ni(최대 7,250 mg/kg), Zn(최대 10,000 mg/kg), Mo(최대 2,930 mg/kg) Cu(최대 1,410 mg/kg) 및 Co(최대 87 mg/kg)등이 매우 높은 함량으로 나타났으며 이들 원소의 부화 순서는 Cr>Ni>Zn>Mo>Cu>Co이다. Fe 스케일에서 Cr의 함량이 증가하면 Mo, Ni, Cu 및 Co의 함량도 함께 증가하였다. Fe 스케일에서 Fe2O3 함량이 증가하면 SiO2, Al2O3, CaO, Na2O 및 TiO2 등의 함량은 감소 경향을 보였으나 Cr, Ni, Mo 및 Cu 등의 중금속함량은 증가하였다. 지하수 공의 Fe 스케일에 대한 XRD분석에서 비정질의 철수산화물, 침철석, 석영, 고령토, 조장석 등이 관찰 되었다. 침철석을 판명하는데 이용하는 4.18Å(hkl=100), 2.69Å(hkl=130) 및 2.44Å(hkl=111)의 회절 크기가 지하수 심도가 증가할 수 록 증가하고 있다. Fe 스케일에 대한 SEM 분석에서 철산화박테리아의 일종인, 협막(sheath)을 형성하는 Leptothrix와 나선형 줄기로된 Gallionella 종(species)들이 관찰되었으며, 특히 나선형의 Gallionella 줄기 표면에 미세구형 혹은 포도송이구조의 철수산화물들이 무수히 침전되어 있는 것이 관찰되었다. Fe 스케일로 구성된 Fe 생물막의 중앙 단면에서 다수의 능철석 결정들이 관찰되었다.

Abstract

The object of this study is to investigate the geochemistry for Fe scale formed in groundwater well at Chosun University. The composition of Fe scale consist mainly of Fe2O3 and SiO2. The content of Fe2O3 ranges from 8.77 wt.% to 79.1 wt.% and SiO2 content ranges from 4.43 wt.% to 61.1 wt.%. Heavy metal elements such as Cr (max. 94,400 mg/kg), Ni (max. 7,250 mg/kg), Zn (max. 10,000 mg/kg), Mo (max. 2,930 mg/kg) Cu (max. 1,410 mg/kg) and Co (max. 87 mg/kg) were observed to be rich in those scales. When placed in order of high content it accounts for, Cr>Ni>Zn>Mo>Cu>Co is the result. As the content of Cr increases in Fe scale, so do the elements of Mo, Ni, Cu, and Co. The content of SiO2, Al2O3, CaO, Na2O and TiO2 decrease as Fe2O3 increase, whereas the content of Cr, Ni, Mo and Cu increase in Fe scales. Amorphous iron hydrate, goethite, quartz, kaolinite and albite were identified in Fe scales by x-ray powder diffraction. The height of diagnostic peaks for 4.18Å(hkl=100), 2.69Å(hkl=130) and 2.44Å(hkl=111) in goethite was increased with the depth. In the IR analysis, the OH-stretching vibration, the -OH bending vibration and the δ-OH-bending vibration of diagnostic absorption bands for goethite were only found in the surface of Fe scale at the submersible-pumps. The iron-oxidizing bacteria, helically stalked Gallionella and sheathed Leptothrix species were identified in Fe scale by the SEM and EDS analysis. The micro-spherical shape and the framboid structure of iron hydroxide were precipitated in twisted stalk Gallionella cell surface. The numerous siderite crystals were observed from the cross section of the biofilms that were composed of Fe oxides.

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