표제지
요약
목차
제1장 서론 12
제1절 연구배경 및 목적 12
제2절 연구내용 및 범위 14
제2장 이론적 배경 15
제1절 토양세척 (Soil Washing) 15
1. 토양세척의 원리 15
2. 토양세척의 제약 16
제2절 동전기 정화 (Electrokinetic Remediation) 18
1. 동전기 현상 18
2. 전기분해 (Electrolysis) 19
3. 전기이동 (Electromigration) 20
4. 전기영동 (Electrophoresis) 21
5. 전기삼투 (Electroosmosis) 22
제3절 킬레이트제 (Chelating Agents) 24
1. Citric Acid 26
2. Oxalic Acid 27
3. EDTA (Ethylene Diamine Tetraacetic Acid) 28
제3장 실험재료 및 방법 30
제1절 실험재료 30
1. 세척분리 미세토 30
2. 킬레이트제 31
제2절 실험방법 32
1. 세척분리 미세토의 물리·화학적 특성분석 32
2. 회분식 실험 37
3. 실험실 규모의 동전기 정화 실험 40
제4장 실험결과 46
제1절 세척분리 미세토의 물리·화학적 특성분석 46
제2절 회분식 실험 49
1. 킬레이트제의 종류 선정 49
2. 킬레이트제의 최적 반응을 위한 pH 선정 49
3. 킬레이트제의 최적 농도 선정 51
4. 킬레이트제의 효과 확인 54
제3절 실험실 규모의 동전기 정화 실험 58
1. 동전기 장치 운행 중 전해액의 모니터링 58
2. 동전기 장치 운행 종료 후 세척분리 미세토의 분석 65
제5장 결론 75
제6장 참고문헌 78
Abstract 83
Table. 2.1. Stability constants for EDTA-metal complexes 25
Table. 2.2. Properties of EDTAs 29
Table. 3.1. The characteristics of chelating agents 31
Table. 3.2. Experimental conditions of electrokinetic process 42
Table. 3.3. Monitoring characteristics operating process 44
Table. 3.4. Physico-chemical characteristics to fine soil 45
Table. 4.1. The physico-chemical characteristics of fine soil 46
Table. 4.2. The concentration of contaminants in fine soil 47
Table. 4.3. Extraction concentration of fine soil related to chelating agents 49
Table. 4.4. The result of sequential extraction before/after application Na₂EDTA 55
Table. 4.5. Final recovery rate of contaminants in EK1 to EK3 74
Fig. 2.1. The general process of soil washing 16
Fig. 2.2. The efficiency range for soil washing related to particle diameter 17
Fig. 2.3. The general configuration in electric field 18
Fig. 2.4. Electrokinetic phenomena - electromigration 20
Fig. 2.5. Electrokinetic phenomena - electrophoresis 21
Fig. 2.6. Electrokinetic phenomena - electroosmosis 22
Fig. 2.7. The schematic illustration of the citric acid and metal reaction 27
Fig. 2.8. The configuration of metal-EDTA complex 28
Fig. 3.1. Sampling Site 30
Fig. 3.2. Fine soil after soil washing 30
Fig. 3.3. The Procedure of Tessier's 5 stage sequential extraction 37
Fig. 3.4. The Schematic diagram of bench-scale electrokinetic apparatus 41
Fig. 3.5. The actual units for electrokinetic experiments 43
Fig. 4.1. The result of sequential extraction in fine soil 47
Fig. 4.2. The result for optimal pH with As 50
Fig. 4.3. The result for optimal pH with Cd 50
Fig. 4.4. The result for optimal pH with Cu 50
Fig. 4.5. The result for optimal pH with Pb 50
Fig. 4.6. The optimal concentration for Na₂EDTA with As 52
Fig. 4.7. The optimal concentration for Na₂EDTA with Cd 52
Fig. 4.8. The optimal concentration for Na₂EDTA with Cu 53
Fig. 4.9. The optimal concentration for Na₂EDTA with Pb 53
Fig. 4.10. Result of sequential extraction before application with Na₂EDTA 56
Fig. 4.11. Result of sequential extraction after application with Na₂EDTA 56
Fig. 4.12. pH measured in EK2 to EK3 during 30 days 58
Fig. 4.13. EC measured in EK2 to EK3 during 30 days 60
Fig. 4.14. Recovery rate of As from soil to electrolytes in EK1 to EK3 61
Fig. 4.15. Recovery rate of Cd from soil to electrolytes in EK1 to EK3 62
Fig. 4.16. Recovery rate of Cu from soil to electrolytes in EK1 to EK3 63
Fig. 4.17. Recovery rate of Pb from soil to electrolytes in EK1 to EK3 64
Fig. 4.18. Variation of pH after electrokinetic remediation 66
Fig. 4.19. Variation of EC after electrokinetic remediation 66
Fig. 4.20. Variation of CEC after electrokinetic remediation 67
Fig. 4.21. Variation of TOC after electrokinetic remediation 68
Fig. 4.22. As residue in fine soil according to distance from anode 69
Fig. 4.23. Cd residue in fine soil according to distance from anode 70
Fig. 4.24. Cu residue in fine soil according to distance from anode 71
Fig. 4.25. Pb residue in fine soil according to distance from anode 72