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Fig. 1. Water pumped through the biofilter tumbles by gravity through a forced-ventilation cascadeaeration(Gunton, Man., Canada) that treats 4560 l min/stripping tower followed by a LHO™ in a recirculating system at Glacier Springs Fish Farm−1 (1200 USgal min−1) in a 54-tank water reuse systemused to produce fingerling rainbow trout and arctic charr (Summerfelt and Wade, 1998).
Fig. 2. Water flow collected at the base of a trickling filter is often pumped through a downflow bubblecontactor (e.g
Fig. 3. U-tubes (left), oxygenation cones (middle), and multi-stage low head oxygenators (right) are examples of technologies used to add pure oxygen inlarge recirculating systems.
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