표제지
요약
목차
1. 서론 15
1.1. 연구배경 및 목적 15
1.2. 연구내용 및 구성 17
2. 이론적 배경 20
2.1. 비소 20
2.1.1. 비소의 형태 및 특성 20
2.1.2. 비소의 유해성 23
2.1.3. 인체 내 비소 대사과정 26
2.1.4. 비소의 자연계 순환 28
2.2. 비소 오염 30
2.2.1. 비소 오염의 발생 원인 30
2.2.2. 국내 지하수의 비소 오염 현황 32
2.2.3. 해외 비소의 오염 현황 34
2.3. 비소의 처리방법 37
2.3.1. 석회 연수화(lime softening) 38
2.3.2. 역삼투압(Reverse Osmosis) 39
2.3.3. 이온 교환법(Ion Exchange Technology) 40
2.4. 응집·침전 43
2.4.1. 응집·침전의 특징 43
2.4.2. 응집·침전의 영향인자 44
2.4.3. 응집제 종류에 따른 특징 47
2.4.4. 비소 응집·침전 처리법 기존 연구사례 50
3. 연구 내용 및 방법 51
3.1. 연구 재료 51
3.1.1. 비소 및 공존이온 인공시료 51
3.2. 실험방법 및 조건 54
3.2.1. 비소의 제거 실험 절차 54
3.2.2. 응집·침전 실험방법 54
3.3. 분석방법 58
3.3.1. 비소 및 공존이온 분석 58
3.3.2. 유도결합플라스마-원자발광분광법 59
3.3.3. 이온크로마토그래피 분석법 59
4. 결과 및 고찰 60
4.1. 응집제 종류에 따른 처리효율 60
4.1.1. 응집제 종류에 따른 비소(V)의 농도별 처리효율 61
4.1.2. 응집제 종류에 따른 비소(III)의 농도별 처리효율 65
4.2. 공존이온에 따른 처리효율 70
4.2.1. 비소(V) 응집·침전시 공존이온에 따른 영향 70
4.2.2. 비소(III) 응집·침전시 공존이온에 따른 영향 75
4.3. 비소의 산화형태에 따른 응집침전의 처리효율 83
5. 결론 86
참고문헌 88
ABSTRACT 92
Table 2.1. Molecular forms of arsenic and arsenic compounds in nature 21
Table 2.2. International Human Safety Standard for Arsenic 23
Table 2.3. Domestic and international drinking water arsenic standards 24
Table 2.4. Arsenic standards by domestic legislation 24
Table 2.5. Current Status of Arsenic Contamination by Measurement Network 33
Table 2.6. Arsenic Concentrations by Country 36
Table 2.7. Commercialized arsenic treatment technology 37
Table 3.1. Groundwater stationary ion 52
Table 3.2. Coexistence ion experimental concentration 53
Table 3.3. Reagent properties for coexisting ion experiments 53
Table 3.4. Amount of coagulant and coagulant aid 55
Table 3.5. first Jar test conditions 56
Table 3.6. Second Jar test conditions 56
Table 3.7. Third Jar test conditions 57
Table 3.8. Analytical methods for water quality analysis 58
Table 4.1. Experimental results according to arsenic(V) concentration 64
Table 4.2. Experimental results according to arsenic(III) concentration 69
Table 4.3. Solubility of the precipitate 73
Table 4.4. Arsenic(V) treatment efficiency according to coexisting ions 74
Table 4.5. Arsenic(III) 0.5 mg/L treatment efficiency according to coexisting ions 78
Table 4.6. Arsenic(III) 5 mg/L treatment efficiency according to coexisting ions 82
Fig 1.1. Flow chart of this study 19
Fig 2.1. Eh-pH As diagram for aqueous arsenic species in the system AsO₂ - H₂O at 25 ℃ and 1 bar total pressure 22
Fig 2.2. human metabolism of arsenic 27
Fig 2.3. Arsenic's Natural Cycle 28
Fig 2.4. Excess rate by substance among groundwater pollution in Korea 33
Fig 2.5. Floc characteristics at different pH and coagulant dose for DOM coagulation 44
Fig 3.1. Schematic diagram of flocculation sedimentation 57
Fig 4.1. Arsenate(V) 0.5 mg/L treatment efficiency according to the type of coagulant 61
Fig 4.2. Arsenate(V) 2 mg/L treatment efficiency according to the type of coagulant 62
Fig 4.3. Arsenate(V) 5 mg/L treatment efficiency according to the type of coagulant 63
Fig 4.4. Arsenic(III) 0.5mg/L treatment efficiency according to the type of coagulant 65
Fig 4.5. Arsenic(III) 2mg/L treatment efficiency according to the type of coagulant 66
Fig 4.6. Arsenic(III) 5mg/L treatment efficiency according to the type of coagulant 67
Fig 4.7. Effect of nitrogen ions in Arsenic(V) 0.5 mg/L agglomeration treatment 71
Fig 4.8. Effect of nitrogen ions in Arsenic(V) 5 mg/L agglomeration treatment 72
Fig 4.9. Effect of ions in Arsenic(III) 0.5 mg/L agglomeration treatment 76
Fig 4.10. Effect of ions in Arsenic(III) 0.5 mg/L agglomeration treatment 77
Fig 4.11. Effect of ions in Arsenic(III) 5 mg/L agglomeration treatment 80
Fig 4.12. Effect of ions in Arsenic(III) 5 mg/L agglomeration treatment 81
Fig 4.13. Changes in arsenic(III) 5 mg/L coagulation treatment efficiency according to the amount of hydrogen... 84