These units are specifically designed and manufactured to remove unwanted
dissolved gases such as ammonia from water. Depending upon operating
volumes and diameters required, I.A.S. Products Ltd. utilizes P.V.C. A.B.S.
and/or F.R.P. tanks with internal fibreglass grates, packing media, and top
distribution pipes to drop and spray water down over the packing media.
>From the top distribution pipes water is cascaded down over packing media
where it interfaces with up welling air. Maximum performance is obtained
using a low energy blower or air circulation system to create a moderate
level of negative pressure within the vessel. This negative internal tank
pressure insures that static air is drawn in through ports around the lower
half of the unit, drawn up the interior of the vessel, and through the
packing media to meet the cascading water from above.
This process insures that maximum interface between air and water is
obtained and the resulting 'gassed' off material is drawn away from the
vessel as part of the function of the blower or air draw system used within
the vessel. Due to the simple nature and low blower energy requirements of
this process, this equipment has proven to be a very effective and efficient
means of stripping gases from water.
USE PICTURE NUMBER 10 ag.gif
FRESH and SALT WATER FARM SITE RECIRCULATION SYSTEMS:
With attention focusing on maximizing feed conversion and fish growth rates,
I.A.S. Products Ltd. is working closely with industry leaders to provide a
range of Hydro-Spreader and Aero-Spreader feed broadcasters necessary to
reduce feeding competition and stress along with the SEEMATE C1 underwater
video camera system for fish feed and fish observation.
To complete this support package it has proved equally important for I.A.S.
Products Ltd. to address many of the environmental factors that limit the
farmer's ability to maximize feed conversion and fish growth rates. Feed
conversion rates and maximum growth potentials are often restricted due to
such environmental factors as poor water quality, temperature gradients,
poor site water circulation, inadequate oxygen levels, and winter ice up
conditions and the resulting limited pen access.
ALL SEASON APPROACH.
In many instances the need for farm site water circulation and aeration is
required. In the summer months temperature gradients (thermoclines) affect
water quality and 02 levels and in the winter months surface freeze occurs
restricting feeding capabilities resulting in lost fish growth potential.
Traditional aeration and circulation equipment such as propeller, paddle,
and other mechanical surface aerators are often assumed to be the best
methods for maximizing water aeration, agitation and circulation. However,
with the use of Ramco MAT aeration and site circulation units a simple,
cost effective aeration, circulation and complete site mixing system is at
Ramco MAT Aeration and site circulation units may be used alone or in
multiples. Each Ramco MAT unit is suspended vertically in the water column
beneath a ball float. To each Ramco MAT unit is attached a length of pipe
used to draw water up the column with the length of pipe set to the water
draw depth desired. The Ramco MAT system operates on the airlift principle,
receiving air at a pressure just sufficient to combat static head and loses
from friction. Air enters the aerator through a diffuser at the base of the
Ramco MAT unit (set at the10 foot depth below the surface) and is pushed
upward. The rapidly rising air-water mixture passes through free-turning
counter rotating turbines which shear the air pockets into millions of
This air/water mixing creates a low pressure zone within the MAT unit. This
low pressure zone is used to draw water up the length of pipe from below the
Ramco unit, up through the column and across the surface of the pen. The
water drawn from depth is colder and heavier in nature and it is this
characteristic that is used to create a complete site pumping action. Cold
dense water is drawn to the surface where it travels across the surface and
sinks back down to be once again picked up by the Ramco unit and returned to
the surface. As part of this cycle the turbine action creates vigorous
subsurface turbulence and exceptionally high oxygen transfer. Significant
additional aeration also occurs in the surface boil. It is this ability to
impart an excellent surface boil and a complete site circulation that are
used to improve aeration, water mixing and to reduce and eliminate ice pack
conditions around fish pens.
Air is supplied using a small power pack running a blower to supply the low
pressure (3-5 psi) and medium volume (18 cfm ) air per Ramco MAT unit. One
or more units can be connected throughout the farm using a simple air line
manifold to provide complete site upwelling and water circulation. Using
this method of air delivery Ramco MAT units can be easily added or removed
USE PICTURES 11 (blower assembly) 12,13,14,and15ag.gif (best picture of
winter freeze up)
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This is a description of feature 1.
This is a description of feature 2.
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