Journal of Marine Life Science (한국해양생명과학회지)

The Korean Society of Marine Life Science (한국해양생명과학회)
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Improvement of Water Quality by Corona Discharge Plasma-activated Water in a Tilapia Recirculating Aquaculture System

코로나 방전-플라즈마 처리수의 틸라피아 순환여과양식시스템 수질 개선 효과

  • You, Jin Ho (Department of Aquatic Life Medical Sciences, Sunmoon University) ;
  • Mun, Seong Hee (Department of Aquatic Life Medical Sciences, Sunmoon University) ;
  • Oh, Hyeon Ji (Department of Aquatic Life Medical Sciences, Sunmoon University) ;
  • Park, Tae Sup (JIN JIN E&T Co., Ltd.) ;
  • Kwon, Joon Yeong (Department of Aquatic Life Medical Sciences, Sunmoon University)
  • 유진호 (선문대학교 수산생명의학과) ;
  • 문성희 (선문대학교 수산생명의학과) ;
  • 오현지 (선문대학교 수산생명의학과) ;
  • 박태섭 ((주)진진이앤티) ;
  • 권준영 (선문대학교 수산생명의학과)
  • Received : 2020.11.13
  • Accepted : 2020.12.01
  • Published : 2020.12.16
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Abstract

Disinfection and maintenance of rearing water in aquaculture is an essential element for the prevention of fish diseases. This is especially important in recirculating aquaculture systems (RAS) in which fish are reared at high density using recycled water. In this study, tilapia was reared in two different RAS (one with plasma generator - PW system, another without plasma generator - No PW system). In plasma treated group, UVT% of water was improved clearly, and the number of heterotrophic bacteria decreased significantly after 40 days. Total weight gain of tilapia in PW system was significantly higher, and other growth indicators were also relatively higher although not statistically significant. In addition, the fish in PW system had a 100% survival rate, and there were no histological differences between fish from both systems. Fish did not seem to be affected by the toxicity of ROS. In conclusion, it is expected that plasma water can effectively deactivate fish pathogens and improve the quality of rearing water.

순환여과양식시스템(RAS)은 사육수를 여과하여 재사용하며 고밀도로 사육하는 양식 방법으로 수질관리 및 소독이 매우 중요하다. 병원체로 인한 질병 발생을 예방하고 수질 개선에 도움을 주기 위하여 최근 코로나 방전 플라즈마 처리수(plasma water, PW)를 이용한 사육수 소독법이 제안되었다. 본 연구에서는 플라즈마 발생장치를 설치한 순환여과시스템(처리구, PW system)과 설치하지 않은 순환여과시스템(대조구, No PW system)에서 40일 동안 틸라피아를 사육하면서 수질 변화 및 어체의 성장을 조사하였다. 이를 위해 10일 마다 물을 채수하여 UV 투과율과 일반 세균 수 변화를 측정하였고 틸라피아의 성장지표, 생존율 및 조직학적인 차이를 분석하였다. UV 투과율 실험 결과 처리구와 대조구는 실험 시작 시에(0일) 각각 74.1%, 74.8%를 나타냈으며, 40일째에 처리구는 91.8%로 증가한 반면 대조구는 65.2%로 감소하여 수중 유기물 감소 효과를 확인하였다. 일반 세균 수는 40일에 이르러 처리구(101.69 CFU/ml)에서 대조구(103.25 CFU/ml) 보다 유의하게 감소하였다(p<0.05). 틸라피아 성장차이 조사 결과 처리구는 대조구에 비해 총 증중량이 유의하게 높았으며(p<0.05), 다른 성장지표도 처리구가 상대적으로 높았으나 통계적으로 유의한 차이는 아니었다(p>0.05). 또한 처리구는 100%의 생존율을 보였으며, 조직학적으로 대조구와 차이가 나타나지 않았다. 따라서 플라즈마 처리수는 순환여과양식시스템 내 어류의 성장과 건강에 해를 끼치지 않고 수질 개선에도 효과가 있을 것으로 기대된다. 그러나 현장 적용 시에는 탈기수조의 설치 등 주의사항을 충분히 고려하여야 할 것이다.

Keywords

Acknowledgement

본 결과물은 농림축산식품부의 재원으로 농림식품기술기획평가원의 농식품연구성과후속지원사업의 지원을 받아 연구되었음(818006-2).

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