The Radial Flow Settler Design
The new 6 foot tank design uses a
built in Radial Flow Settler (RFS) which uses gravity to concentrate the solids
of the water from the bottom tank drain, described in the slideshow.
- Bottom
Drain: Most of the waste water of the
tank containing fecal material and left over feed leaves the tank through
the bottom drain. This water is sent to the RFS to concentrate the solids
by gravity in the cone shaped structure of the RFS. By opening the valve
periodically, these solids are flushed out of the system as effluent. When
the valve is closed this bottom drain water will settle out in the RFS and
the cleaner of this water overflows to be recirculated.
- Side
Drain: Most of the tank water flows
out of the tank through the side drain. This cleaner water of the tank is
sent directly to the recirculation pipe.
- Recirculation: The water that will be recirculated is gravity fed
into the recirc sump where it will be pumped up to a degassing/aeration column
to be aerated and stripped of carbon dioxide. This is done by
percolating the water through a matrix of plastic material. The recirculation
water is then sent to the tanks via a gravity distribution line.
- Key
Points: This is a partial
recirculation system, which will recirculate 50-70% of the water. This
system does not require a drum filter nor a biofilter which will greatly
decrease equipment costs, while still practicing sustainable aquaculture
by conserving water. This system is showing to work well at low densities,
higher densities may require an additional drum filter for solid removal.
Learn more about the development of this system...
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