참나무 탄화물을 이용한 질산성 질소의 제거에 관한 연구
- Issued Date
- 2010
- Keyword
- 질산성질소
- Abstract
- Abstract
A Study on the Removal of Nitrate Nitrogen by Carbonaceous Materials Prepared from Oak
By: Kim, Jung Ae
Advisor: Prof. Cheong Kyung-Hoon Ph. D
Department of Environmental-Biological Engineering
In recent, the nitrate nitrogen pollution in lakes, rivers and underground water has become a serious issue. A new purification method for nitrate nitrogen is required, because no efficient means of purification has been established yet. Carbonization processing is one of the techniques of effectively using wood biomass. The obtained charcoal is widely used for a variety of purpose such as water purification and humidity control, and as soil conditioner. However, the charcoal obtained by mere carbonization is expected to have limited use. Thus, a laboratory experiments have studied charcoal with the ability to absorb nitrate nitrogen. In this paper, the adsorption behavior of nitrate anion and mechanism in aqueous solution investigated using FeCl3-dipped charcoal(FT), HCl-treated charcoal(AT) and FeCl3-HCl treated charcoal(FTAT). Also, The influence of various parameters such as NO3- concentration, adsorbent dose, pH, different anion, repeated adsorption and temperature has been studied.
The removal efficiency of nitrate was increased with increasing of dosage of adsorbents. The NO3--N removal was not affected by the pH under the experiment range of pH. The degree of removal was found to be dependent on temperature and it is increased as the temperature decrease. It was found that the obtained charcoal had the ability to absorb nitrate and fluoride anion but not sulfate and phosphate anions. The adsorbents was regenerated using KCl solution, and recovery was about 76.6% at 1 M of KCl. Batch adsorption studies have shown that the adsorption reaction can be described by the second-order reversible reaction. The process of uptake obeys both Langmuir and Frendlich isotherms. The thermodynamic parameters were also calculated to elucidate the adsorption mechanism.
The values of △Ho and △So were obtained from the slope and intercept of the van't Hoff plots of in b vs 1/T. The negative value of the △Ho suggests the exothernic nature of adsorption. The negative values of △Go indicates the spontaneous nature of adsorption of NO3- by the adsorbents(AT and FTAT). The negative value of △So shows that the freedom of molecules of NO3- is more restricted in the charcoal particles(AT and FTAT) than in solution. The plots of the in C vs 1/T at different surface loading were found to be linear and △Hx values were calculated from the slope of the curves. The value of the △Hx was almost constant and was independent of surface loadings. The order of magnitude of the value indicates a weakend chemical mechanism for the adsorption of NO3- on to AT and FTAT. The results of the investigation are quite useful for the removal of NO3- from ground water using batched or stirred tank flow reactor.
- Alternative Title
- A Study on the Removal of Nitrate Nitrogen by Carbonaceous Meterials Prepared from Oak
- Alternative Author(s)
- Kim, Jung Ae
- Affiliation
- 조선대학교 대학원
- Department
- 일반대학원 환경공학
- Advisor
- 정경훈
- Awarded Date
- 2010-08
- Table Of Contents
- 목 차
List of Tables ⅰ
List of Figures ⅱ
Abstract ⅴ
Ⅰ. 서 론 1
Ⅱ. 이론적 고찰 3
2-1. 지하수 3
1) 지하수 오염 3
2) 지하수의 질산염의 고농도화 3
2-2. NO3-N 제거 기술 4
1) 역삼투압법 4
2) 전기투석법 5
3) 생물학적 탈질법 5
4) 이온교환법 5
5) 0가 금속을 이용한 환원법 6
6) Fe(OH)2을 이용한 환원법 7
2-3. 흡착 8
1) 활성탄 흡착의 개념 9
2) 활성탄 흡착의 특성 10
(1) 분자구조 10
(2) 표면장력 10
(3) 용해도 11
(4) pH와 이온성 11
(5) 농도 11
(6) 온도 11
(7) 흡착등온선 12
3) 활성탄에 대한 흡착량 13
4) 활성탄 흡착탑 14
5) 활성탄의 재생 15
2-4. 이온교환수지 17
1) 이온교환수지의 종류와 반응 18
(1) 강산성 양이온교환수지 18
(2) 약산성 양이온교환수지 20
(3) 강염기성 음이온교환수지 21
(4) 약염기성 음이온교환수지 23
2) 이온교환용량 24
3) 이온교환수지의 성능 저하 28
2-5. 선택계수 29
2-6. 흡착등온선 30
2-7. 흡착속도 상수 31
2-8. NO3-N가 흡착에 미치는 온도의 영향 31
2-9. Enthalpy 계산 32
Ⅲ. 실험방법 및 분석 33
3-1. 염화철 및 산 처리 목탄 시료의 제조 33
3-2. 목탄의 물성 33
3-3. NO3-N 흡착실험 34
1) FT 실험 34
2) AT 실험 35
3) FTAT 실험 37
3-4. 분석항목 및 측정방법 40
Ⅳ. 결과 및 고찰 42
4-1. NO3-N 제거 42
1) 참나무 탄화물의 물성 42
2) FT의 열처리 온도에 따른 NO3-N 흡착 53
3) FT의 초기 NO3-N 농도에 따른 NO3-N 흡착 55
4) AT의 열처리 온도에 따른 NO3-N 흡착 57
5) AT의 HCl농도에 따른 NO3-N 흡착 59
6) AT의 투입량에 따른 NO3-N 흡착 60
7) AT의 진탕 속도에 따른 NO3-N 흡착 61
8) AT의 pH에 따른 NO3-N 흡착 62
9) AT의 흡착온도에 따른 NO3-N 흡착 63
10) AT의 흡착 등온선 68
11) AT의 Langmuir와 Freundlich model 69
12) 흡착속도 상수 73
13) NO3-N가 흡착에 미치는 온도의 영향 76
14) AT의 여러 음이온에 대한 흡착 80
15) AT를 충진한 컬럼에서의 NO3-N 연속 흡착 82
16) FTAT의 투입량에 따른 NO3-N 흡착 83
17) FTAT의 pH에 따른 NO3-N 흡착 85
18) FTAT의 흡착온도에 따른 NO3-N 흡착 86
19) FTAT의 흡착 등온선 91
20) FTAT의 Langmuir와 Freundlich model 92
21) 흡착속도 상수 96
22) NO3-N가 흡착에 미치는 온도의 영향 99
23) FTAT에 의한 NO3-N 반복 흡착 104
24) FTAT를 충진한 컬럼에서의 NO3-N 연속 흡착 106
Ⅴ. 결 론 107
1. 참나무 탄화물의 물성 107
2. FT를 사용한 NO3-N 흡착제거 107
3. AT를 사용한 NO3-N 흡착제거 107
4. FTAT를 사용한 NO3-N 흡착제거 109
Ⅵ. REFERENCES 111
- Degree
- Doctor
- Publisher
- 조선대학교 대학원
- Citation
- 김정애. (2010). 참나무 탄화물을 이용한 질산성 질소의 제거에 관한 연구.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/8799
http://chosun.dcollection.net/common/orgView/200000240276
- Appears in Collections:
- General Graduate School > 4. Theses(Ph.D)
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