나노 영가철을 이용한 국내 지하수내 질산성질소(NO3--N) 소거 활용성 조사 = Survey of the capability of nZVI for scavenging against Nitrate-Nitrogen(NO3-N) pollutants in the groung water

다국어 초록 (Multilingual Abstract)

As a result of the survey on major domestic water pollutants in the recent five years, the average of total samples exceeding the guideline was 5.2%, among which NO3--N(Nitrate-Nitrogen) was 22.1%. The most commonly used removal method for the NO3--N was ion exchange resin so far.
The research trend of the nZVI(nano-Zero Valent Iron) was conducted through keyword search during the last 10 years. The number of foreign documents was 1,410 and showed an increasing trend in every year. However, there were 33 domestic documents and difficult to find the increasing tendency.
Typically, the nZVI is synthesisd through the consequence processes of mixing step, separation step, cleaning step, and drying step. However, the nZVI is so quickly oxidative, that corrosion and coagulation are happened together. Recently, additional methods such as surface modification, immobilization, dual solvent, and others have been applied to synthesis of the nZVI.
In this study, the ability of nZVI prepared without washing process was compared with nZVI prepared by clean up process, including the GT-nZVI(Green Tea-nZVI) synthesized utilizing green tea. The NO3--N concentration was measured by using spectrophotometric method and the removal efficiency of NO3--N was ranged between 16% and 79%, depending on the experimental methods.
The nZVI was used to remove heavy metals and ionic pollutants, especially NO3--N removal. Research has also shown that experiments involving the removal of NO3--N accounted for a large proportion. From this point of view, the nZVI will be expected to us as one of the practical ways in the future for removal of NO3--N rather than other pollutants.
The ability of the nZVI to remove contaminants, synthesis and removal mechanisms of the literature are suggested. The comparison studies with existing methods were investigated for removing NO3--N from the ground water. As a result, the bio-degradable polymer of the surface modification of the nZVI was found to be the most practical method in the field. It is expected that surface deformation studies and trials for testing practical use of the nZVI will be worthy to pursue further.
Keywords: nZVI, Green Tea, Nitrate-Nitrogen, Polymer, Surface modific- ation, mechanism, ground water

목차 (Table of Contents)

• List of Figures ⅳ
• List of Tables ⅴ
• Abstract ⅵ
• Ⅰ. 서론 1
• Ⅱ. 이론적 배경 3
• 1. 국내 지하수 주요오염물질 및 정화 방법 3
• 1.1. 조사범위 및 수질 기준 3
• 1.2. 주요오염물질 현황 분석 6
• 1.3. 국내 지하수의 정화 방법 10
• 1.4. 질산성질소 생성 및 특성 12
• 2. 나노 영가철의 특성 14
• 2.1. 반응성 14
• 2.2. 부식과 산화 17
• 2.3. 탈질 효소 활성 18
• 2.4. 독성 19
• 3. 나노 영가철의 연구동향 분석 20
• 3.1. 조사 방법 20
• 3.2. 연구동향 분석 21
• 3.3. 국내 연구 동향 24
• 4. 나노 영가철의 합성 및 오염물질 제거 특성 27
• 4.1. 나노 영가철의 이론적 합성 27
• 4.1.1. 합성 과정 27
• 4.1.2 Greener 나노 영가철의 합성 29
• 4.1.3. 저장 과정 30
• 4.2. 질산성질소 이론적 제거 31
• 4.2.1. 화학적 제법에 의한 나노 영가철 31
• 4.2.2. Greener 나노 영가철 32
• 5. 실제적 나노 영가철의 합성 및 적용 33
• 5.1. 화학적 제법에 의한 나노 영가철 33
• 5.2. Greener 나노 영가철 34
• 6. 향후 나노 영가철의 발전방향 37
• 6.1. 고정화 38
• 6.2. 표면개질 39
• 6.2.1. 이중금속 39
• 6.2.2. 폴리머 40
• 6.3. 그 외 개선 요소 41
• Ⅲ. 정제된 영가철 및 미정제된 영가철의 반응 특성 비교 42
• 1. 비교 방법 42
• 2. 시약 및 제조 43
• 3. 영가철과 녹차 추출물-FeCl3의 부피비율별 질산성질소 제거 44
• 4. 영가철과 질산성질소와의 몰비별 질산성질소 제거 46
• 5. 영가철의 pH별 질산성질소 제거 48
• Ⅳ. 결론 50
• Ⅴ. 참고문헌 52
• 감사의 글 60