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 424
- Downloads 17
ENVIROMENTAL AND GENETIC ASPECTS OF WEANING WEIGHT IN NATIVE CATTLE OF COLOMBIA
Data of 1877 native cattle (Romosinuano) weaning weight born between 1980 to 2001, were analyzed. The weaning weight average was 182,88 ± 0,67 kg, the standard desviation was of 29.35 kg and variation of coeficient was...
Monitoring rumen environment in finishing Lidia bulls
Objective. The aim of this work was to characterize the changes in rumen pH and temperature in finishing Lidia breed bulls reared on pasture and fed a total mixed ration (TMR). Materials and methods. Five 4-year-old Lidi...
RESTRICCIÓN DEL AMAMANTAMIENTO EN VACAS DEL SISTEMA CRÍA LIBRE
In order to increase the pregnancy rate which it was found diminished by the incidence of a long anoestrus postpartum in lactating cows in the farm Andalucía, the technology or «restriction of the suckling period to 30 m...
CANINE LYMPHOSARCOMA
A 5 year-old female Creole canine was taken to the veterinary clinic of the Universidad de Los Llanos, with anorexy history and with a lesion in the front region of face. The hemathological analysis showed light anemia,...
Microbiota of Vibrio sp. in the hepatopancreas of cultured white pacific shrimp (Litopenaeus vannamei)
Objective. The present study aimed to investigate the presence of vibrios in the hepatopancreas of cultured shrimp. Materials and methods. Vibrios from the hepatopancreas of fifteen samples of five specimens each, of app...