표제지

목차

Part I. 슬래그반응기의 광산배수 내 Mn, Ni 제거효율 평가 (Assessing removal efficiencies of Mn and Ni in mine drainage at slag reactors) 14

요약 15

1. Introduction 16

2. Materials and Methods 18

2.1. 제강슬래그 및 석회석 18

2.2. 실험방법 20

2.3. 분석 방법 31

3. Results and discussion 33

3.1. 회분식 실험 결과 33

3.2. Slag 컬럼 실험 결과 36

3.3. 파일럿 테스트 결과 51

3.4. 실규모 수처리 시설 공정설계인자 67

4. Conclusion 71

References 73

ABSTRACT 77

Part II. 알럼 슬러지 기반 흡착제의 Zn 흡착효율 평가 (Assessments of Zn adsorption efficiencies an alum slude-based adsorbent) 78

요약 79

1. Introduction 80

2. Metrials and Methods 81

2.1. 흡착제 81

2.2. 실험방법 84

2.3. 분석 방법 89

3. Results and discussion 90

3.1. 회분식 실험 결과 90

4. Conclusion 104

References 105

ABSTRACT 109

Part I 8

Table 1. XRF analysis results of steel slag used in this study 19

Table 2. Average water quality of adit drainage from Taewoo coal mine in 2016 22

Table 3. Average water quality of adit drainage from Cheongsan coal mine in (2016) 24

Table 4. Initial stabilization column experiment PHREEQC saturation index results 38

Table 5. PHREEQC saturation indices of Acidic column experiment 41

Table 6. PHREEQC saturation indices of Neutral column experiment 43

Table 7. Hydaulic conductivities of the weir-type slag reactor 56

Table 8. PHRREQC saturation index results of the outflow from the weir-type slag reactor 57

Table 9. Hydaulic conductivities of the baffle-type slag reactor 60

Table 10. PHRREQC saturation index results of the outflow from the baffle-type slag reactor 61

Table 11. Hydaulic conductivities of the column-type slag reactor 64

Table 12. PHRREQC saturation index results of the outflow from the column-type slag reactor 65

Table 13. Process and design factors of passive treatment of Cheongsan coal mine 67

Table 14. Process and design factors for the passive treatment of Taewoo coal mine drainage 69

Part II 8

Table 15. XRF results of alum sludge-based adsorbent 82

Table 16. Results of BET analysis for alum sludge-based adsorbent 83

Table 17. Initial concentration of adsorption isotherm and pH changes before and after reaction. 96

Table 18. Langmuir adsorption model parameters for Zn adsorption of alumsludge-based adsorbent 96

Table 19. Freundlich adsorption model parameters for Zn adsorption of alumsludge-based adsorbent 96

Part I 10

Fig 1. The shape and size of the steel slag used in this study 18

Fig 2. The shape and size of the limestone used in this study 18

Fig 3. Rotating thermo-temperature shaker for slag batch experiments 20

Fig 4. Bench-scale slag reactor used in this study 21

Fig 5. Pilot-scale Mn treatment slag reactor (weir/baffle wall-type). 25

Fig 6. Pilot-scale Mn treatment slag reactor (baffle-type). 26

Fig 7. Pilot-scale Mn treatment slag reactor (column-type). 27

Fig 8. Pilot-scale upper baffle-type precipitation tank. 28

Fig 9. Weir-type pilot-scale slag reactor 29

Fig 10. Baffle-type pilot-scale slag reactor 29

Fig 11. Column-type pilot-scale slag reactor 30

Fig 12. Upper radial inlet of the slag reactor 30

Fig 13. Upper baffle-type precipitation tank 30

Fig 14. Changes of Mn concentration and pH according to reaction time of slag (inflow of high concentration, solid:liquid ratio of 1:10) 33

Fig 15. Changes of Mn concentration and pH according to reaction time of slag (concentration inflow low, solid:liquid ratio of 1:10) 34

Fig 16. Changes of Mn concentration and pH according to reaction time of slag+limestone (inflow of low concentration, solid:liquid ratio of 1:10) 35

Fig 17. Results of slag column experiments with 7 phases 36

Fig 18. Mn, Fe, and Ni concentrations and pH according to residence time in the lab-scale slag reactor at the initial stage 37

Fig 19. Manganese removal efficiency according to the residence time at the stage of acidic inflow 39

Fig 20. Nickel removal efficiency according to the residence time at the stage of acidic inflow 40

Fig 21. The residence time and change in pH of neutral inflow 42

Fig 22. Manganese removal efficiency according to the residence time at the stage of neutral inflow 45

Fig 23. Nickel removal efficiency according to the residence time at the stage of neutral inflow 46

Fig 24. SEM images of Mn precipitate in the slag reactor 47

Fig 25. SEM image of birnessite 47

Fig 26. SEM image of birnessite 47

Fig 27. EDS results of Mn precipitate in the slag reactor 48

Fig 28. Plot of pe versus pH for outflow samples of the slag reactor 49

Fig 29. PHREEQC manganite saturation indices of results of column experiments with 7 phases 50

Fig 30. Mn concentration according to residence time for three types of slag reactors. 51

Fig 31. Alkalinity of effluents and influents from the pilot-scale reactors 52

Fig 32. Mn concentration according to residence time for weir-type and baffle wall-type of slag reactors. 53

Fig 33. Mn concentration according to the pH of the weir-type slag reactor. 55

Fig 34. Mn concentration according to the water temperature of the weir-type slag reactor. 55

Fig 35. Mn concentration according to residence time for baffle-type slag reactors. 58

Fig 36. Mn concentration according to the pH of the baffle-type slag reactor. 59

Fig 37. Mn concentration according to the water temperature of the baffle-type slag reactor. 59

Fig 38. Mn concentration according to residence time for column-type slag reactors. 62

Fig 39. Mn concentration according to pH for column-type slag reactors. 63

Fig 40. Mn concentration according to water temperature for column-type slag reactors. 63

Fig 41. Plot of pe versus pH for outflow samples of the three types of slag reactor. 66

Part II 12

Fig 42. Alum sludge-based adsorbent (diameter: 3mm) 81

Fig 43. PZC results of alum sludge-based adsorbent 82

Fig 44. Rotating thermo-temperature shaker for alum sludge batch experiments 84

Fig 45. Bench-scale alum sludge-based adsorbent adsorption reactor used in this study 88

Fig 46. Changes of Zn concentration and pH according to reaction time of alum sludge-based adsorbent(soild:liquid ratio of 1:0.57) 90

Fig 47. Changes of Zn concentration and pH according to reaction time of alum sludge-based adsorbent(soild:liquid ratio of 1:12.5) 91

Fig 48. Pseudo-first-order kinetic model of Zn adsorption kinetics 92

Fig 49. Pseudo-second-order kinetic model of Zn adsorption kinetics 92

Fig 50. Changes of Zn concentration and pH according to reaction time of alum sludge-based adsorbent(soild:liquid ratio of 1:50) 93

Fig 51. Changes of amount of Zn sorption to reaction time of alum sludge-based adsorbent(soild:liquid ratio of 1:50) 94

Fig 52. Changes of amount of Zn sorption to initial conxentration of alum sludge-based adsorbent(soild:liquid ratio of 1:200) 95

Fig 53. Zn adsorption isotherm of alum sludge-based adsorbent (soild:liquid ratio 1000:1) 97

Fig 54. Langmuir adsorption model for Zn adsorption isotherm of alum sludge-based adsorbent 97

Fig 55. Feundlich adsorption model for Zn adsorption isotherm of alum sludge-based adsorbent 97

Fig 56. Zn concemtration of pH after sorption (solid liquid ratio 1:1000) 99

Fig 57. Changes amount of Zn sorption of range of pH 5~8 100

Fig 58. Changes amount of Zn sorption of range of pH 2~6 100

Fig 59. Results of alum sludge-based column experiments with 3 phases 101

Fig 60. SEM images of adsorbent surface in this study 102

Fig 61. SEM images of ZnO 102

Fig 62. SEM images of ZnO 102

Fig 63. EDS results of adsorbent surface in this study 103