소성 굴 패각의 연안 퇴적물 재부상 및 인산인 용출 억제에 관한 연구
- Alternative Title
- A effect of pyrolyzed oyster shell on suppression of the coastal sediment resuspension and phosphate release
- Abstract
- In order to evaluated the physico-chemical effects of calcium on resuspension and phosphate removal, calcium hydroxide and pyrolyzed oyster shells were applied to cohesive sediment. The results obtained through this study are summarized as follows. Therefore, the main elements of this study can be divided into physical and chemical behavior. Physical behaviors include changes in sediment resuspension and viscosity by calcium, and chemical behaviors include changes in CEC and SAR due to calcium concentrations and changes in PO4-P concentrations. The results obtained through this study are summarized as follows.
Sediment resuspension tended to decrease with increasing calcium concentration. In the case of Ca(OH)2-10.0 g, suspended solids(SS) concentration increased by 448%, which is lower than that of Ca(OH)2-0 g by 1170%. In addition, when the oyster shells pyrolyzed at high temperature were covered, SS concentration was low, especially at POS600, which showed very low SS concentration. Through this phenomenon, it was confirmed that calcium has an effect of suppressing sediment resuspension.
It was found that as the calcium concentration in the sediment increases, the sediment exhibits shear thinning behavior. When the calcium hydroxide and pyrolyzed oyster shells were covered, the n coefficients were found to be between 0.02 and 0.18 and 0.05 and 0.18, respectively, in the shear rate and viscosity regression equations. Also, viscosity increased by 194.7% in Ca(OH)2-10.0 g, 723% in POS600-1.0 and 520% in POS800-0.5. As a result, the sediment viscosity was increased by the calcium eluted from the pyrolyzed oyster shell, and especially, the oyster shell pyrolzyed at a high temperature had a significant effect on the increase in the viscosity of the sediment.
Although the calcium concentration in the sediment increased, the CEC did not show significant changes since Na was dominant factor in the sediment. However, the SAR tended to decrease with increasing Ca(OH)2 content, while in the case of pyrolyzed oyster shells, the SAR also increased with increasing pyrolyzing temperature. It is considered that the reason why the increase and decrease of SAR is caused by the cation exchange between calcium and eluted Na and Mg in the oyster shell.
The concentration of PO4-P in the overlying water was different depending on the pyrolyzing temperature and covering thickness of the oyster shell. When the oyster shell pyrolyzed at 800℃ was covered, the PO4-P concentration in the overlying water tended to decrease, however, oyster shell pyrolyzed at 100℃ led to increase of the PO4-P concentration in the overlying water. And in the case of the oyster shell pyrolyzed at 600℃, the PO4-P concentrations decreased with 0.5 cm covering thickness, but increased when 0.5 cm was covered. The PO4-P concentration in the pore water decreased with ranged from 9.7 to 72.9% regardless of the pyrolyzing temperature and covering thickness and the higher the pyrolyzing temperature of the oyster shell, the higher decrease in the PO4-P concentration.
Based on the above results, it was confirmed that the pyrolzyed oyster shells increased the calcium concentration in the sediment, and it leads to suppress sediment resuspension and effects PO4-P removal. The above results can be used as fundamental research when using pyrolyzed oyster shells as the remediation material in the coastal area.
- Issued Date
- 2020
- Awarded Date
- 2020. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Alternative Author(s)
- Jeong, Il Won
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 해양공학과
- Advisor
- 이인철
- Table Of Contents
- 1. 서론 1
1.1. 연구 배경 1
1.1.1. 연안환경의 중요성 1
1.1.2. 오염퇴적물의 발생원인 및 재부상의 영향 2
1.1.3. 재부상 억제 방안의 한계 5
1.1.4. 굴 패각의 특성 및 적용 가능성 6
1.2. 연구 목적 및 내용 7
2. 재료 및 방법 9
2.1. 퇴적물 관련 이론 9
2.1.1. 점착성 퇴적물의 특징 9
2.1.1.1. Cohesion과 Adhesion 10
2.1.1.2. DLVO 이론 11
2.1.1.3. 퇴적물 침식의 원인과 종류 13
2.2. 실험 방법 15
2.2.1. 실험 장치 및 구성 15
2.2.2. 실험방법 및 분석 16
2.2.2.1. 실험 방법 16
2.2.2.2. 측정 및 분석 항목 16
2.3. PIV를 활용한 환형수조 유속 및 전단응력 측정 실험 20
2.3.1. PIV의 정의 20
2.3.2. PIV 실험 장비 및 소프트웨어 20
2.3.3. 유속 측정 실험 방법 21
2.3.4. PIV 이미지 분석 27
2.3.5. 저면 전단응력 도출 29
2.4. 탁도 및 부유물질 농도 상관관계 실험 30
2.5. 수산화칼슘의 혼합에 따른 퇴적물 거동 31
2.5.1. 실험 방법 및 분석 31
2.6. 굴 패각의 소성 온도 및 피복 두께에 따른 퇴적물 거동 32
2.6.1. 굴 패각 재료의 특징 및 소성 32
2.6.2. 소성 굴 패각의 XRF, XRD 분석 34
2.6.3. 실험 퇴적물의 성상 34
2.6.4. 실험 방법 및 분석 항목 35
3. 결과 및 고찰 38
3.1. PIV를 활용한 환형수조 유속 및 전단응력 분포 결과 38
3.1.1. 환형수조 내 횡방향 유속분포 38
3.1.2. 환형수조 내 종방향 유속분포 41
3.1.3. 환형수조 내 저면 전단응력 분포 44
3.2. 탁도 및 부유물질 농도 상관관계 결과 50
3.3. 수산화칼슘의 혼합에 따른 퇴적물 거동 51
3.3.1. 탁도 변화 51
3.3.2. 퇴적물 재부상 입자의 플럭스 변화 53
3.3.3. 점성 및 전단률 관계 55
3.3.4. CEC 및 SAR 분석 결과 57
3.4. 굴 패각의 소성 온도 및 피복 두께에 따른 퇴적물 거동 60
3.4.1. 소성 굴 패각의 XRF, XRD 분석 결과 60
3.4.2. 탁도 변화 63
3.4.2.1. 소성 굴 패각 1.0 cm 피복 후의 결과 63
3.4.2.2. 소성 굴 패각 0.5 cm 피복 후의 결과 65
3.4.3. 부유물질 농도 및 플럭스 변화 67
3.4.3.1. 소성 굴 패각 1.0 cm 피복 후의 결과 67
3.4.3.2. 소성 굴 패각 0.5 cm 피복 후의 결과 70
3.4.3.3. 피복 두께에 따른 부유물질 농도 변화 비교 72
3.4.4. 점성 및 전단률 관계 73
3.4.5. 직상수의 pH, ORP, PO4-P 분석 결과 75
3.4.6. 간극수의 pH, ORP, PO4-P 분석 결과 83
3.4.7. CEC 및 SAR 분석 결과 91
3.4.7.1. 소성 굴 패각 1.0 cm 피복 후의 결과 91
3.4.7.2. 소성 굴 패각 0.5 cm 피복 후의 결과 94
4. 요약 및 결론 97
5. 참고문헌 101
- Degree
- Master
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