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총 잔류산화제(TRO) 제어 기술을 이용한 양식 넙치의 생산성 향상 연구

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Alternative Title
A study on the productivity improvement of Olive Flounder, Paralichthys olivaceus using total residual oxidant (TRO) control technology
Abstract
In this study, the fish mortality rate, feeding status, swimming status, etc. were analyzed by applying ozone to seawater to sterilize influent water and improve water quality. In addition, the correlation between Total residual oxidant (TRO) and Oxidation reduction potential (ORP) was confirmed according to the amount of ozone injected for sterilization, the degree of neutralization of TRO was analyzed according to the amount of neutralizer injected, and the mortality of fish was analyzed. In general, ozone is widely applied to the sterilization and removal of pollutants in industrial water treatment industries such as water and sewage. Unlike ozone applied to freshwater, its application in seawater is very different. Ozone has a very short half-life of 5.3 seconds because it reacts rapidly with bromine ions widely distributed in seawater. However, the half-life of TRO produced by reaction with bromide is relatively long, so TRO can accumulate rapidly with residence time. Therefore, when applied to saltwater fish farming, it is important to automatically adjust the TRO value to maintain an acceptable TRO value for the fish, and if it exceeds the allowable value, it will die. Ozone can be applied in a variety of ways to saltwater fish farming. In order to completely inactivate viruses or parasites contained in the influent, the highest CT value among the influent pathogens is selected and the corresponding ozone injection rate is applied to maintain the TRO concentration for inactivation of the pathogens. In this study, the experiment was conducted focusing on the olive flounder, which has the highest production among domestic farmed fish species. In the case of influent sterilization treatment, in order to secure sufficient residence time to consider the CT value for parasite death, it stays for about 3 minutes or more in the ozone reaction tank (Skimmer) and PE tank (reservoir), and sodium thiosulfate is added to neutralize the high TRO. was used. In order to check and control the neutralization of TRO, the ORP value was allowed to flow into the aquaculture tank in the range of 250 to 280mV. In addition, when configured with a closed-loop water treatment such as seawater RAS, a protein skimmer is typically used to remove fish metabolites and dissolved organic matter and particulate matter. When controlling by injecting plasma (ozone) into Protein Skimer, the aggregation effect is excellent and water quality can be effectively improved by removing the organic matter dissolved in the water. However, if the TRO concentration exceeds the allowable range for farmed fish, it puts a great stress on the fish and eventually leads to death. Therefore, the appropriate TRO concentration range of farmed fish was identified, and the fish status and mortality according to exposure to TRO concentration were analyzed. In addition, in order to effectively control the amount of ozone in the low TRO concentration range, it was compared with the ORP value according to the TRO concentration. The ORP value can be maintained proportionally and linearly according to the TRO concentration, so it was analyzed that the method of automatically controlling the ozone injection amount would be sufficient. However, when high-concentration ozone for influent sterilization was injected, the ORP value did not remain proportionally linear at the high TRO concentration, so it was confirmed that a separate ozone injection rate algorithm was needed. As a result of analyzing the TRO tolerance of Oliver flounder in the flow-through method, it was possible to confirm the stability of the fish at 30 ppb or less.
Author(s)
한정호
Issued Date
2022
Awarded Date
2022. 2
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000010597
Alternative Author(s)
Han, Jung Ho
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부 에너지화학공학전공
Advisor
목영선
Table Of Contents
I. 서론 1
II. 이론적 배경 및 문헌 검토(Literature survey) 6
1. 어류양식 현황, 양식장의 물관리 현황 및 최신 공정 6
1) 어류양식 현황 6
2) 유수식 어류 양식장에서의 물관리 현황 9
3) 어류 양식장에서의 물관리 최신 공정 23
2. 오존(O3) 특성과 이를 이용한 물관리 기법 29
1) O3의 일반 특성과 해수에서의 특성 29
(1) 총 잔류산화제(Total residual oxidant, TRO) 값의 중요성 35
(2) O3 처리 39
(3) 유기물 감소 40
(4) 살균 41
(5) 맛 및 냄새 개선 44
2) 문제점 46
(1) 과다 사용 사례 등 46
(2) 싸이오황산나트륨(Na2S2O3)의 위해성 47
(3) O3의 불안전성 48
3) 양식장 적용을 위한 개선방안 관련 연구현황 49
(1) 잔류산화제 vs. 순환 여과 양식 시스템 50
(2) 잔류 오존 50
(3) 잔류 오존 측정 방법 비교 51
III. 재료 및 방법 54
1. 실험 설계 54
2. 오존 및 총 잔류산화제(TRO) 생산 54
3. 실험 장치 및 방법 55
1) 유입 해수의 (살균) 전처리를 위한 오존 발생 시스템 구축 55
2) 양식 수조 내 수질 환경 분석 66
3) 생리활성도 분석 67
IV. 결과 및 고찰 71
1. 살균장치로서 오존의 살균효과 규명을 위한 TRO 생성 및 제어 71
1) 해수 전처리 살균시스템을 위한 오존의 생산 특성 71
2) 살균 TRO 및 중화 TRO 농도에 따른 ORP 값의 변화 75
3) 오존의 기생충 사멸 효과 78
4) 오존 주입량에 따른 탁도(NTU)의 변화 80
5) 수질 정화 능력 분석 82
6) 총 잔류산화제(TRO)가 넙치의 생존에 미치는 영향 90
2. 건강도 분석 91
1) 생존율, 성장률, 사료효율 및 사료 섭이률 91
2) 스트레스 반응과 혈액학적 상관 분석 92
3) 면역력 지표 분석 96
4) 일반 성분(수분, 조단백, 조지질 및 회분) 분석 98
V. 결론 100
참고문헌 103
감사의 글 113
Degree
Doctor
Publisher
제주대학교 대학원
Appears in Collections:
Faculty of Applied Energy System > Energy and Chemical Engineering
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