|Design and performance of a water recirculation system to culture the African catfish (Abstract)|
Bovendeur, J.; Eding, E.H. (1989). Design and performance of a water recirculation system to culture the African catfish (Abstract), in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 971
In: De Pauw, N. et al. (Ed.) (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene, Belgium. ISBN 90-71625-03-6. 1-592 pp., more
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|Document type: Conference paper|
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- Bovendeur, J.
- Eding, E.H.
The final performance of a water recirculating system is the resultant of the waste production of fish on the one hand and the waste removal by the water-treatment installation on the other. In this paper the design, operation, and performance of a recirculation system are presented, based on earlier experiments on the nitrification kinetics of attached biofilm material in relation to the ambient concentrations of ammonium and dissolved oxygen. The starting points for the system design were a minimized size of the water treatment installation and a minimized requirement of fresh exchange water. Therefore, the selected system configuration consisted of a primary lamella separator and a trickling filter operated under conditions inducing 0-order nitrification kinetics (75m² surface area.kg-1 feed.d-1). The observed NH4-N concentrations in the fish tank before feeding (2.5 ±1.1 g NH4--N.m-3 were comparable to or lower than the expected values (about 3.5g.m-3. The average water exchange rate was 0.08 m³.d-1.kg-1 feed resulting in nitrate concentrations up to 200g NO3-N.m-3. The results indicate that the design and operation techniques are effective tools to develop water recirculation systems for aquaculture purposes.