C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 3/04 (2006.01) A01K 63/04 (2006.01)
Patent
CA 2118783
The invention relates to a water treatment system and more particularly to a fish tank and biofilter for use in a fish aquaculture. The fish tank has a double outlet system whereby solid waste particles are drawn continually into a central well by a trickle of water flowing through the well and out stand-pipe apparatus exterior of the tank. Clarified water is withdrawn from the center of the fish tank through a manifold having an outlet above the well and conducted to a spray bar of a separate biofilter apparatus. The biofilter includes a rotating spray bar distributing water over a bed of floating media pellets, the water exiting the spray bar causing momentarily and cyclically dynamic flow loading of the bed of pellets below it whereby the pellets are gently agitated. Fine particles in the clarified water to be filtered and biofilter growth particulates gently scoured from the media fall to a cone-shaped bottom of the biofilter tank and gravitate to a central well from which the solid fine wastes can be periodically flushed. The filtered water is returned to the fish tank by a filtered water manifold having an inlet above the bottom of the biofilter tank but below the floating media.
Finlayson & Singlehurst
Vantoever J. Wayne
LandOfFree
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