표제지
요약
목차
1. 서론 15
1.1. 연구배경 및 목적 15
1.2. 연구내용 및 범위 18
2. 이론적 고찰 20
2.1. 하수처리 과정 20
2.1.1. 침사지 및 유량조정조 20
2.1.2. 최초침전지(1차 침전지) 21
2.1.3. 생물반응조 21
2.1.4. 최종침전지 21
2.1.5. 소독시설 21
2.2. 하수처리장 소독기술 22
2.2.1. 염소 소독 22
2.2.2. UV 소독 25
2.2.3. 오존 소독 29
3. 연구내용 및 방법 32
3.1. 대상시료 특성 32
3.2. 실험개요 37
3.2.1. 초자 세척 및 멸균 37
3.2.2. 시약 37
3.2.3. 실험장치 37
3.2.4. 대장균군 검출시험 방법(수질오염공정시험기준) 40
3.3. 염소 소독에 의한 대장균 제거실험 41
3.3.1. 염소 주입량 및 접촉시간 실험 41
3.3.2. 온도 실험 42
3.3.3. 교반속도 실험 42
3.3.4. 초기 pH 실험 43
3.4. UV 소독에 의한 대장균 제거실험 44
3.4.1. UV 조사량 실험 44
3.4.2. SS 농도에 따른 UV 조사량 실험 44
3.5. 염소/UV 조합소독에 의한 대장균 제거실험 45
4. 연구결과 47
4.1. 염소 소독에 의한 대장균 소독 효과 47
4.1.1. 염소 주입량 및 접촉시간 실험 47
4.1.2. 온도 실험 50
4.1.3. 교반속도 실험 52
4.1.4. 초기 pH 실험 53
4.2. UV 소독에 의한 대장균 소독 효과 55
4.2.1. UV 조사량 실험 55
4.2.2. SS 농도에 따른 UV 조사 실험 56
4.3. 염소/UV 조합소독에 의한 대장균 소독 효과 59
5. 결론 66
References 69
ABSTRACT 74
Table. 2.1. Characteristics of chlorine gas 22
Table. 3.1. Sewage reuse: Water quality standards by utilization purpose 34
Table. 3.2. Characteristics of sewage secondary treated water 36
Table. 3.3. Dimensions of UV contactor 39
Table. 3.4. Chlorine dosage and contact time experimental conditions 41
Table. 3.5. Temperature experimental conditions 42
Table. 3.6. Agitation speed experimental conditions 43
Table. 3.7. Initial pH experimental conditions 43
Table. 3.8. UV dose experimental conditions 44
Table. 3.9. UV dose experimental conditions based on SS concentration 45
Table. 3.10. Chlorine/UV combination disinfection experimental conditions 46
Table. 4.1. Removal rate of E. coli based on chlorine dosage and contact time 49
Table. 4.2. Residual chlorine concentration based on chlorine dosage and contact time 50
Table. 4.3. Removal rate of E.coli based on chlorine disinfection temperature 51
Table. 4.4. Removal rate of E. coli based on chlorine disinfection agitation rate 53
Table. 4.5. Removal rate of E. coli based on initial pH during chlorine disinfection 54
Table. 4.6. Removal rate of E. coli based on UV radiation dosage 55
Fig. 1.1. Flow chart of this study 19
Fig. 2.2. Distribution of HOCl/OCl- based on pH 24
Fig. 2.3. UV light in the electromagnetic spectrum 26
Fig. 2.4. Particle interactions that impact UV efectiveness 28
Fig. 3.1. Monthly E. coli count at B public sewage treatment plant in 2022 33
Fig. 3.2. B public sewage treatment plant process 35
Fig. 3.3. Chlorine contactor: jar-tester 38
Fig. 3.4. Pocket colorimeter 38
Fig. 3.5. UV dosage experiment reactor 40
Fig. 4.1. Removal rate of E. coli based on chlorine dosage and contact time 49
Fig. 4.2. Removal rate of E. coli based on chlorine disinfection temperature 51
Fig. 4.3. Removal rate of E.coli based on chlorine disinfection agitation rate 52
Fig. 4.4. Removal rate of E. coli based on initial pH during chlorine disinfection 54
Fig. 4.5. Removal rate of E. coli based on UV radiation dosage 56
Fig. 4.6. Removal rate of E. coli in sample 1 based on UV disinfection 57
Fig. 4.7. Removal rate of E. coli in sample 2 based on UV disinfection 58
Fig. 4.8. Removal rate of E. coli in sample 3 based on UV disinfection 58
Fig. 4.9. Removal rate of E. coli based on UV disinfection and suspended solids (SS) concentration 59
Fig. 4.10. Comparison of E. coli removal rate between chlorine (0.2 mg/L)/UV combined disinfection and UV... 60
Fig. 4.11. Comparison of E. coli removal rate between chlorine (0.2 mg/L)/UV combined disinfection and chlorine (0.2 mg/L) single... 61
Fig. 4.12. Comparison of E. coli removal rate between chlorine (0.5 mg/L)/UV combined disinfection and UV... 62
Fig. 4.13. Comparison of E. coli removal rate between chlorine (0.5 mg/L)/UV combined disinfection and chlorine (0.5 mg/L) single... 62
Fig. 4.14. Comparison of E. coli removal rate between chlorine (0.2 mg/L)/UV combined disinfection and UV... 63
Fig. 4.15. Comparison of E. coli removal rate between chlorine (0.2 mg/L)/UV combined disinfection and chlorine (0.2 mg/L) single... 64
Fig. 4.16. Comparison of E. coli removal rate between chlorine (0.5 mg/L)/UV combined disinfection and UV single... 65
Fig. 4.17. Comparison of E. coli removal rate between chlorine (0.5 mg/L)/UV combined disinfection and chlorine... 65