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The use of ozone in a high density recirculation system for rotifers
Suantika, G.; Dhert, P.; Rombaut, G.; Vandenberghe, J.; De Wolf, T.; Sorgeloos, P. (2001). The use of ozone in a high density recirculation system for rotifers. Aquaculture 201(1-2): 35-49. dx.doi.org/10.1016/S0044-8486(01)00532-4
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622
Peer reviewed article  

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Trefwoorden
    Aquaculture systems > Recirculating systems
    Aquaculture techniques
    Chemical elements > Nonmetals > Atmospheric gases > Oxygen > Dissolved gases > Dissolved oxygen
    Chemical reactions > Nitrification
    Control > Quality control > Water quality control
    Fluids > Gases > Atmospheric gases > Ozone
    Particulates > Suspended particulate matter
    Recirculation
    Bacteria [WoRMS]; Brachionus plicatilis Müller, 1786 [WoRMS]; Rotifera [WoRMS]
    Marien; Brak water; Zoet water
Author keywords
    Brachionus plicatilis; recirculation; ozone; rotifers

Auteurs  Top 
  • Suantika, G.
  • Dhert, P.
  • Rombaut, G.
  • Vandenberghe, J.
  • De Wolf, T.
  • Sorgeloos, P.

Abstract
    The use of ozone in the effluent treatment of a closed recirculation system for rotifers resulted in a significant improvement of rotifer production and water quality. Compared to a control treatment, the rotifer culture exposed to ozone did not only support a higher rotifer biomass (16000 vs. 8000 rotifers ml-1), it also allowed a prolongation of the culture period for 4 days. Compared to a control treatment, the ammonium levels were reduced by 67%, nitrite levels by 85% and nitrate levels by 67%. The supplementation of ozone did not affect pH and dissolved oxygen levels. Besides the positive effect of ozone to the nitrification process, a better removal of suspended solids was noticed as well. This resulted in a decreased turbidity and a reduction of the number of particles in the culture water. The use of ozone also reduced the number of bacteria in the culture water. In general terms, it can be stated that supplementation of ozone in a closed recirculation system for rotifers considerably improves water quality, ensures stable and longer rotifer culture periods and controls bacterial proliferation.

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