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Design and evaluation of a water recycling plant for Atlantic salmon smolt production
Rusten, B.; Harr, C. (1989). Design and evaluation of a water recycling plant for Atlantic salmon smolt production, in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 2. pp. 1143-1148
In: De Pauw, N. et al. (Ed.) (1989). Aquaculture: a biotechnology in progress: volume 2. European Aquaculture Society: Bredene, Belgium. ISBN 90-71625-02-8. 597-1222 pp., more

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Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Rusten, B.
  • Harr, C.

Abstract
    A water recycling plant for Atlantic salmon smolt production has been developed with the aim to reduce water consumption to less than 10% of the water flow. The effluent from the fish tanks goes to a mechanical filter for removal of particles, followed by two aerated submerged biological filters for nitrification and removal of dissolved organics. The recycled water is pumped through a dual media sand filter for removal of fine solids and excess biofilm. UV-generated ozone is added to the water before and after the sand filter. Make-up water is added ahead of a heat exchanger. Water flows then through packed column aerators, before it is returned to the fish tanks. Various ratios of recycled water and make-up water (down to 6% of the flow or 80% of the volume of the system per day) have been tested. Due to high biomass concentrations, dissolved oxygen levels in the fish tanks have been as low as 4.4mg.l-1, and generally below 6.0mg.l-1. Nevertheless, daily growth of Atlantic salmon juveniles of 2.1% was observed at a mean temperature of about 14°C. Water has been of good quality, with median values of 0.15mg.l-1 of NH4+-N, 0.016mg.l-1 of NO2-N, 0.6mg.l-1 of suspended solids (SS) and 22mg.l-1 of COD.

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