Flow pattern in aquaculture circular tanks: Influence of flow rate, water depth, and water inlet &amp; outlet features

Oca, Joan; Masaló, Ingrid

doi:10.1016/j.aquaeng.2012.09.002

Cited by 81 publications

(60 citation statements)

References 25 publications

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“…Timmons [3] also described an irrotational zone near the center of the tank. Oca and Masalo [2] stated that velocities in circular tanks decrease from the outer wall to the center of the tank, just as was observed in both flow treatments used in this study. Even though velocities were reduced by the presence of the verticallysuspended rods, there was still a large central vortex with both flows, just as was described by [4].…”

Section: Discussionmentioning

confidence: 58%

“…It would also explain the more pronounced effects of rods at higher velocities observed by Kientz and Barnes [7]. While some water velocity has been shown to improve fish growth and feeding efficiency [8,9], higher velocities can lead to decreased rearing performance [10,11] due to excessive energy requirements [2].…”

Section: Discussionmentioning

confidence: 82%

“…The rods were equally spaced approximately 11.0 cm apart, arranged into an array within a 15 × 40 cm area, and placed directly opposite of the spray bar. Each one had a surface area of 170 cm 2 . Water entered the tank via a spray bar inclined at 45° below the horizontal.…”

Section: Methodsmentioning

confidence: 99%

“…In comparison to rectangular rearing units, circular tanks have uniform water quality [1,2] and the distribution of velocities inside the tank is very heterogeneous. Circular tanks are also self-cleaning, with solid waste flushed through a center drain [3].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Moine¹,

Me²,

Kientz³

et al. 2016

J Fisheries Livest Prod

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Moine¹,

Me²,

Kientz³

et al. 2016

J Fisheries Livest Prod

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“…Para la remoción de sólidos en las unidades de cultivo, es muy común en acuacultura el uso de tanques circulares con entrada tangencial del agua y salida localizada en el fondo ya que permiten obtener patrones de flujo más estables. Esto permite una distribución más homogénea del oxígeno disuelto y los metabolitos y mejores condiciones de auto limpieza, gracias a las características de flujo rotacional (18). Para la remoción de partículas del agua residual se utilizan diversos métodos, los cuales pueden clasificarse como: filtración mecánica, también conocida como colado o micro tamizado, la filtración profunda, llamada filtración por arena y la sedimentación.…”

Section: Introductionunclassified

Desempeño de tanques decantadores de sólidos en un sistema de recirculación para producción de tilapia

Matsumoto

2013

Rev MVZ Córdoba

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RESUMENObjetivo. Comparar la eficiencia de remoción de sólidos, turbidez y color aparente en un decantador convencional y uno de columna en un sistema de recirculación acuícola (SRA) para cultivo de tilapia. Materiales y métodos. Se cultivaron tilapias con densidad entre 30 y 33 kg/m 3 en un SRA, el cual constó de: caja de nivel constante, tubería en PVC, tres tanques de cultivo, decantador convencional de flujo horizontal (D.Con), decantador de columna de flujo ascendente (D.Col), reactor de lecho fluidizado trifásico, reactor para transferencia de oxígeno, compresor, blower, electrobomba. El D.Con operó con volumen útil (VU) de 1.4 m 3 y tiempo de retención hidráulica (TRH) de 2.94 h, fue vaciado una vez por semana para lavado y colecta del lodo, representando sustitución del 55% del volumen del sistema. El D.Col operó con 0.30 m 3 de VU y TRH de 0.553 h. Se realizaron 3 sangrados diarios, representando sustitución semanal de 50% del volumen. Resultados. Las eficiencias promedio de remoción fueron: para sólidos totales de 34.01 y 44.44%; sólidos suspendidos 64.45% y 71.71%; sólidos volátiles 21.10 y 45.65%; para turbidez 65.51 y 62.79%; para color aparente 56.37 y 50.91%, respectivamente en el D.Con y el D.Col. Conclusiones. Ambos decantadores son útiles en la remoción de los parámetros estudiados y presentaron comportamientos semejantes en remoción de turbidez y color aparente. Sin embargo, el D.Col es más eficiente que el convencional para remoción de los sólidos, ocupa menor espacio, menor volumen y requiere menor porcentaje de renovación, mostrando viabilidad para su utilización en SRA.Palabras clave: Acuicultura, gravimetría, recirculación, tilapia, SRA (Fuente: DeCS). Rev.MVZ Córdoba 18(2):3492-3500, 2013. ORIGINAL 3493 ABSTRACTObjective. To compare the removal efficiency of solids, turbidity and apparent color between a conventional and a column settling tanks in a recirculating aquaculture system (RAS) for tilapia farming. Materials and methods. Tilapia with a stocking density between 30 and 33 kg/m 3 were cultured in a RAS consisting of a water level control box, PVC piping system, three plastic tanks for culture, conventional horizontal flow settling tank (Con.ST), column vertical flow settling tank (Col. ST), three phase fluidized bed reactor, oxygen transfer reactor, air compressor, air blower, centrifugal pump. The Con.ST operated at a volume of 1.4 m 3 and hydraulic retention time (HRT) of 2.94 h; and was drained weekly for washing and sludge collection, representing a 55%discharge of system water volume. The Col.ST operated with a volume of 0.30 m 3 and HRT of 0.553 h. Three daily partial draining operations were executed, representing a discharge of 50% of the system volume. Results. The mean solids removal efficiencies were: 34.01 and 44.44%for total solids; 64.45 and 71.71% for suspended solids; 21.10 and 45.65% volatile solids; 65.51% and 62.79% for turbidity; and 56.37 and 50.91% for apparent color, respectively for Con.ST and Col.ST. Conclusions. The two settling devices are useful on remo...

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Use of Suspended Plastic Conduit Arrays during Brown Trout and Rainbow Trout Rearing in Circular Tanks

et al. 2018

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Environmental enrichment is the modification of otherwise sterile hatchery rearing units to provide structural complexity. We investigated the use of an array of suspended plastic conduit sections as enrichment in large circular tanks during two experiments. Brown Trout Salmo trutta and Rainbow Trout Oncorhynchus mykiss were reared for 126 and 61 d, respectively, in covered, 3.63‐m‐diameter circular tanks that were either void of any structure or enriched with a suspended array of twenty 0.94‐m‐long sections of plastic conduit. Total tank weight gain and feed conversion ratio were significantly improved for both Brown Trout and Rainbow Trout reared with suspended conduit as enrichment compared to unenriched tanks. Enrichment did not significantly affect individual fish length, weight, or condition factor in either experiment, likely because of small sample sizes. The suspended array did not interfere with tank hydraulic self‐cleaning. Based on the results of this study, the use of vertically suspended enrichment structures in circular tanks is recommended to improve trout rearing efficiencies.

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Flow pattern in aquaculture circular tanks: Influence of flow rate, water depth, and water inlet & outlet features

Abstract: Postprint (published version

Cited by 81 publications

References 25 publications

Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Desempeño de tanques decantadores de sólidos en un sistema de recirculación para producción de tilapia

Use of Suspended Plastic Conduit Arrays during Brown Trout and Rainbow Trout Rearing in Circular Tanks

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