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제주도 지하수 중 바나듐의 산출 및 거동 특성

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Alternative Title
Characteristics of Occurrence and Behavior of Vanadium in Jeju Island Groundwater, Korea
Abstract
The objective of this work was to investigate the characteristics of occurrence and behavior of vanadium in Jeju Island groundwater using Jeju Island groundwater data from 2006 to 2014 and analytical data of soil pore water of wetland. Moreover, batch leaching experiments were carried out under various geochemical conditions (redox potential (Eh) and pH) and under conditions similar to natural environments using basaltic paleo soil, in order to understand the characteristics of occurrence and behavior of vanadium in Jeju Island water more evidently. The results obtained were summarized as follows. The concentrations of groundwater vanadium were in the range of 0.2~71.0 μg/L (average 12.0 μg/L) and showed local enrichments without temporal variation and without variation with surface geology, land use, and altitude. Vanadium concentration was significantly positively correlated with that of major ions (Cl-, Na+ and K+) and siderophilic elements (As, Cr, and Al) among trace matals, and pH, but was negatively correlated with NO3-N concentration. It seemed to be that vanadium concentration was geochemically controlled by especially pH of groundwater, namely the high concentrations of vanadium (> 30 μg/L) occurred in groundwater with high pH (≥ 8.0), indicating that a high degree of water-rock interactions resulted in vanadium enrichment, but vanadium concentration was remarkably lower in groundwater of Na-Ca-Cl(NO3) type that represented the influence of anthropogenic pollution. Vanadium was detected in very low concentration or not detected in groundwater containing high concentration of carbonate salt, due to the formation of complex and precipitation between carbonate salt and vanadium. Vanadium concentration was enriched in soil pore water of wetland representing reducing environment with high content of organic matter by the mechanism of reduction and complex formation, indicating wetland was the source of vanadium supply. From the effect of Eh and pH on vanadium leaching using basaltic paleo soil, the geochemical conditions, in which soil-water reactions occurred to form groundwater with high vanadium concentrations, were under alkaline-oxidizing conditions. Considering overall leaching characteristics of Fe, Al, Cr, and V with Eh-pH change, it seemed to be that mainly desorption and dissolution of vanadium adsorbed on iron (hydro)oxides occurred in alkaline leaching, and vanadium was leached by dissolution of silicate minerals containing residual irons, such as pyroxene group in oxidizing conditions. From leaching experiments, the pH and leached vanadium concentrations of the solution were in the ranges of 5.45~5.58 and 6~9 μg/L, respectively, under CO2 supersaturation conditions for the first 15 days, whereas values under O2 aeration conditions after the next 15 days increased to 8.48~8.62 and 9.7~12.2 μg/L, respectively. Vanadium concentrations from the latter leaching experiments were similar to the average concentration of groundwater in Jeju Island (11.2 μg/L). Furthermore leached vanadium concentrations in continuous leaching experiments were highly correlated with pH and Al, Cr, Fe, Mn and Zn concentrations. The results of this study may be applied as a guideline of exploration and exploitation for application of functional vanadium. Moreover, they will be contributed to promoting understanding of distribution and behavior in anionic metals (e.g., As, Cr, U, Se) showing similar behavior with vanadium in water environment
Author(s)
현익현
Issued Date
2017
Awarded Date
2017. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000008045
Alternative Author(s)
Ik-Hyun Hyun
Department
대학원 환경공학과
Advisor
감상규
Table Of Contents
Summary ⅷ
I. 서 론 1
II. 이론적 고찰 3
1. 바나듐의 지화학적 특성 3
1) 수환경 중 바나듐의 기원 3
2) 바나듐 및 산소 음이온(oxyanion)의 종변화 및 거동 5
2. 물-암석 반응 8
4. 제주도의 지질 특성 10
1) 제주도 지질 및 수문지질 10
2) 지하수 유동 및 수화학 특성 12
III. 재료 및 방법 14
1. 시료채취 14
1) 지하수 채수 14
2) 토양 공극수 채수 17
3) 토양 시료채취 18
2. 실험방법 20
1) 시료 분석 20
2) 토양으로부터 바나듐 용출시험 24
3) 자료의 해석 27
IV. 결과 및 고찰 31
1. 지하수 중 바나듐의 산출특성 31
1) 지하수 수질 특성 31
2) 지하수 중 바나듐의 분포 특성 36
3) 주요 용존이온 및 미량성분과의 관계 49
2. 지하수 중 바나듐의 거동 특성 52
1) pH 와의 관계 52
2) 수질유형과의 관계 53
3) 수환경(pHEh) 과의 관계 56
4) 탄산염 농도와의 관계 58
5) 습지 환경과의 관계 66
3. 현무암질 토양의 바나듐 용출실험 70
1) 현무암 토양의 화학조성 70
2) 회분식 용출실험 73
3) 이산화탄소 및 공기 폭기 조건에서의 용출실험 82
V. 결 론 85
VI. 참고문헌 87
Degree
Doctor
Publisher
제주대학교 일반대학원
Citation
현익현. (2017). 제주도 지하수 중 바나듐의 산출 및 거동 특성
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