Performance of sedimentation tanks in a recirculating system for tilapia production
Journal Title: Revista MVZ Cordoba - Year 2013, Vol 18, Issue 2
Abstract
Objective. 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/m3 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 m3 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 m3 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 removal of the studied parameters and presented similar performance on turbidity and apparent color removal; however, the Col.ST was more efficient than Con.ST for solids removal, requires less space, less volume and requires less discharge water volume, displaying feasibility for its use on RAS.
Authors and Affiliations
Yemall Maigual E, M. Sc| Universidad de Nariño, Departamento de Recursos Hidrobiológicos. Ciudad Universitaria, Barrio Torobajo Carrera 42 # 18-109. San Juan de Pasto, Nariño, Colombia., Iván Sánchez O, M. Sc *| Universidad de Nariño, Departamento de Recursos Hidrobiológicos. Ciudad Universitaria, Barrio Torobajo Carrera 42 # 18-109. San Juan de Pasto, Nariño, Colombia.Correspondencia: iaso@udenar.edu.co, Tsunao Matsumoto, Ph. D| Universidade Estadual Paulista Júlio de Mesquita Filho UNESP, Campus de Ilha Solteira, Faculdade de Engenharia, Departamento de Engenharia Civil. Alameda Bahia, 550 CEP: 15.385-000 - Ilha Solteira, São Paulo – Brasil.
Keywords
Related Articles
- EP ID EP3311
- DOI -
- Views 365
- Downloads 17
EVALUACIÓN DEL COMPORTAMIENTO REPRODUCTIVO POSTPARTO, INFLUIDO POR LA ÉPOCA DEL AÑO Y LA RAZA EN BOVINOS BAJO EL SISTEMA DOBLE PROPÓSITO
The objective of this study was to evaluate the effect that exercises the time of the year and the race in the reproductive acting post - I leave of cows managed under the system of double purpose. 28 were used you vacat...
ALTERNATIVE STRATEGIES IN THE MANAGEMENT OF HEIFERS’ MASTITIS
Mastitis in dairy heifers is a problem that has reached remarkable importance since the development of highly specialized dairy operations. The bovine female is susceptible to intramammary infections (IMI) from the momen...
Comparison of methods to determine the energy value of feeds for ruminants
Objective. Compare different methods (MET) to calculate TND based on chemical analysis of diets and digestibility trials. Materials and methods. in vivo digestibility trials were determined using zebu animals fed hay (Cy...
Electrocardiographic parameters in captive, clinically healthy, Amazona ochrocephala
Objective. To stablish the electrocardiographic parameters of individuals of the species Amazona ochrocephala, from the Unidad de Rescate y Rehabilitacion de Animales Silvestres at the Universidad Nacional de Colombia. M...
DETERMINACIÓN DE UN ÍNDICE DE SELECCIÓN PARA EL PESO AL NACER Y AL DESTETE EN GANADO CEBÚ
In order to knowing an index of selection for the weight upon being born and to the weaning in the Costa Rica farm, at Montería (Colombia), 895 data were analyzed of which were obtained the covariances and variances gene...