• Title, Summary, Keyword: Recirculating aquaculture system

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Design and Performance of a Laboratory Scale Closed Seawater Recirculating System for Korean Rockfish Sebastes schlegeli Culture Part 1. Design of the Closed Seawater Recirculating System

  • Lei Peng;Oh, Sung-Yong;Jo, Jae-Yoon
    • Proceedings of the Korean Aquaculture Society Conference
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    • pp.125-125
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    • 2003
  • Recirculating aquaculture systems consist of different treatment compartments that maintain water quality within the ranges of commonly recommended for fish culture. This paper presents the common considerations in designing different treatment compartments as well as the engineering criteria in designing closed recirculating aquaculture system including a circular tank for fish culture, a sedimentation basin and a foam fractionator for solids removal, two styrofoam bead filters for TAN removal, a sand filter for nitrate removal, and aerators. The main purpose is to outline a common procedure in designing of closed recirculating aquaculture system for marine fish culture.

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Numerical Analysis of A Vortex Cyclone in A Recirculating Aquaculture System (순환여과 양식장에서 와류형 분리기에 대한 수치적 검토)

  • Jeong, S.K.;Kim, E.
    • Journal of Power System Engineering
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    • v.9 no.1
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    • pp.36-41
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    • 2005
  • This study investigated the performance of a vortex hydrocyclone for solid removal in a recirculating aquaculture system. In a fish-breeding industry, effluent water is mainly disposed by gravity sedimentation. Thus, a large settling tank and a lot of water are needed to purify effluent water. However, this typical method does not show consistent efficiency. In case of low efficiency, discharged water contains a lot of feeding sediments. This causes environmental problems. Instead of this typical method a hydrocylone is tested to discharge water which contains a lot of feeding sediments. In this paper, a hydrocyclone with low velocity and pressure drop in a recirculating aquaculture system is investigated.

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Solids removal by foam fractionator in simulated seawater aquarium system

  • Lei Peng;Jo, Jae-yoon
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.219-220
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    • 2003
  • The success of recirculating system depends largely on the treatment efficiency of waste generated in the system. fine solids were suspected to be responsible for fish kill in a recirculating system. Clogging of biofilter may be induced by high solids concentration in recirculating systems. Also, the solids could generate more ammonia nitrogen and oxygen demand if not removed out of recirculating system as soon as possible (Weeks et al., 1992). (omitted)

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Removal of Suspended Solids Using a Flexible Fiber Filter in a Recirculating Aquaculture System (유연성 섬유사 여과기를 이용한 순환여과식 양식장의 부유고형물 제거)

  • Choi, Kwang-Soo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.40 no.2
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    • pp.73-78
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    • 2007
  • The suitability of a flexible fiber filter for removing suspended solid (SS) in a recirculating aquaculture system was evaluated. This study focused on variation in the performance with a change in filtering time, influent water quality, and filtering mode duration. The particle distribution diagram of the filter effluent showed that the number of particles bigger than $5-8{\mu}m$ decreased dramatically, and the removal efficiency exceeded 80%. Although the removal efficiencies of SS and chemical oxygen demand (COD) were dependent on the quality of the influent, the SS and COD concentrations of the effluent were not affected by the influent concentrations. This was despite the deterioration if water quality after feeding in the rearing tank. The performance of the filter was not affected by the filtering mode duration, feeding conditions, or filtering time. The SS concentration and turbidity of the recirculating-type rearing tank were 30% and 50% lower, respectively, than of the a non-recirculating-type rearing tank under the same operating conditions. The flexible fiber filter was applicable to a recirculating aquaculture system that uses plenty of seawater, based on its low filtering resistance $(2kg_f/cm^2)$, high flux $(330m^3/m^2/hr)$, and high fine particle removal efficiency (80%, $5-8{\mu}m$).

The Need of Biofilter for Ammonia Removal in Recirculating Aquaculture System

  • Harwanto, Dicky;Jo, Jae-Yoon
    • Journal of Marine Bioscience and Biotechnology
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    • v.4 no.1
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    • pp.1-5
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    • 2010
  • With the world's population increase, demands of fish production increased rapidly. Because of the demand increase, methods of aquaculture also become more intense. With the increasing intensity of aquaculture, more metabolites in the system are accumulated. The metabolites accumulated in the system turn to the causatives of water quality deterioration and become limiting factors for fish growth. Due to the toxicity of ammonia, ammonia removal is needed in aquaculture system. Biofilters, often referred as biological filter or nitrification filter are commonly used in recirculating aquaculture system to remove ammonia and convert it to nitrite, and then to nitrate.

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A Laboratory-scale Recirculating Aquaculture System for Sea Cucumber Apostichopus japonicus (소형 순환여과양식시스템에서 어린 해삼(Apostichopus japonicus) 사육)

  • Jeong, U-Cheol;Jin, Feng;Choi, Jong-Kuk;Han, Jong-Cheol;Choi, Byong-Dae;Kang, Seok-Joong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.49 no.3
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    • pp.343-350
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    • 2016
  • The sea cucumber Apostichopus japonicus is a commercially valuable aquaculture species in Korea. Aquaculture species require specific nursery culture conditions to increase survival and growth rates. Sea cucumbers hibernate during the high temperatures of summer and during the low temperatures of winter, and suboptimal temperature conditions decrease sea cucumber growth and survival rates. The natural South Korean environment is very unfavorable for culturing sea cucumber; therefore, developing a recirculating aquaculture system (RAS) capable of breeding and growing sea cucumber year-round is necessary. The aim of this study was to investigate growth performance of juvenile sea cucumber in a RAS. Growth and survival rates of juvenile sea cucumber were high during our 24-week experiment. Sea cucumber survival rates were 87.8-93.3%, and specific growth rates were 0.4689-0.7846.

Design and Development of Integrated Recirculating Aquaculture System (순환 여과식 양식 시스템의 설계 및 개발)

  • SUH Kuen-Hack;KIM Byong-Jin;JEON Im Gi
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.1
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    • pp.70-76
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    • 2001
  • An integrated recirculating aquaculture system suitable to our country's situation was designes and developed, The integrated recirculating aquaculture system consisting of a double drain type rearing tank of the $2.5 m^3$, a sedimentation tank for removal of settleable solids, a floating bead filter for the removal of suspended solids, a foam separator for removal of fine particles and a rotating biological contactor for the nitrification was designed and manufactured. The integrated recirculating aquaculture system was stocked with nile tilapia (Oreochromis niloticus) at $2\%$ rearing density for 2 weeks. Feed coefficient was 1.4 and average daily growth rate was $0.64\%$ in the system for 2 weeks.

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Complete genome sequence of Flavobacteriaceae strain KCTC 52651 isolated from seawater recirculating aquaculture system (해수 순환여과양식시스템에서 분리된 Flavobacteriaceae 균주 KCTC 52651의 유전체 분석)

  • Kim, Young-Sam;Jeon, Young Jae;Kim, Kyoung-Ho
    • Korean Journal of Microbiology
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    • v.55 no.2
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    • pp.174-176
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    • 2019
  • A novel bacterium, designated strain RR4-38 (= KCTC 52651 = DSM 108068), belonging to the family Flavobacteriaceae was isolated from a biofilter in the seawater recirculating aquaculture system in South Korea. A single complete genome contig which is 3,182,272 bp with 41.9% G+C content was generated using PacBio RS II platform. The genome includes 2,829 protein-coding genes, 6 rRNA genes, 38 tRNA genes, 4 non-coding RNA genes, and 9 pseudogenes. The results will provide insights for understanding microbial activity in the seawater recirculating aquaculture system.

Fecal Solid Feed from the Recirculating Aquaculture System of the Renewable Sea Cucumber Apostichopus japonicus (해삼사료원료로서 육상순환여과양식장 고형오물의 이화학적 특징과 해삼(Apostichopus japonicus)의 소화흡수율)

  • Jeong, U-Cheol;Jin, Feng;Choi, Jong-Kuk;Md, Anisuzzaman;Choi, Byeong-Dae;Kang, Seok-Joong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.49 no.3
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    • pp.330-336
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    • 2016
  • Pollution caused by fecal solids released from recirculating aquaculture systems (RAS) is a growing global concern requiring immediate attention. Thus, this study investigated the physicochemical characteristics of fecal solid feed from RASs used for eel and rainbow trout farming. The concentrations of proteins, lipids, crude ash, and moisture in eel fecal solids were 10.9%, 1.2%, 85.8%, and 72.2%, respectively, while those in rainbow trout fecal solid feed were 20.5%, 3.2%, 70.9%, and 87.0%, respectively. The control group was fed a mixture of sea cucumber and dried sea mud. The protein digestibilities of eel and rainbow trout fecal solids were 25.43% and 23.96%, respectively, while the respective lipid digestibilities were 35.62% and 36.80%, respectively.

Performance of foam fractionator in seawater recirculating system

  • Lei Peng;Jo, Jae-yoon
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.221-222
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    • 2003
  • Typically, closed production system units are subject to an accumulation of fine suspended solids and dissolved organics (Weeks et at., 1992). Foam fractionation process is believed to be most effective in marine application for solids removal. In present experiment, the performance of foam fractionator for removal of solids, protein, and other dissolved materials was evaluated at different foam overflow heights and air flow rates in a pilot-scale recirculating aquaculture system for culture of Korean rockfish. (omitted)

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