Initial situation
apparently clean |
After 10 minutes
of operation |
After 30 minutes
of operation |
The foam that has surfaced is called PROTEIN SKIMMING
OR FOAM FRACTIONATION.
It is characterized by two factors.
- colloidal substances of an organic nature in suspension and
sometimes combined with an inorganic colloidal portion.
These heterogeneous substances may have a different specific gravity
to water and different features of electric polarity, permitting
them in suitable physical or chemicophysical conditions to concentrate
in the water-air interface.
- great dispersion of air in fine bubbles which with the circulation
caused by EOLO causes particles in suspension to be dragged up
to the surface. The high turbulence produces a flow consequently
changing the colloidal suspension.
The removal of dissolved proteins has always been a problem in high-density
breeding situations. Carbon dioxide, ammonia, and excrement are not
the only waste products. Other substances are present from decomposing
feed, urine, lime, and metabolic by-products. In addition, there may
be algae, phenol, and a number of saprophytic bacteria that damage
the gills, limit growth and promote disease. These dissolved substances
and the suspended solids increase B.O.D., nitrates, colour, odour,
flavour, and turbidness. Eolo thus ensures the efficient removal of
proteins, suspended solids, organic substances, including amino acids,
fatty acids, enzymes, fats, many inorganic compounds, phosphorus,
protozoans, and bacteria.
BENEFITS:
- less colloidal turbidity
- grater penetration of sunlight into the depths
- lower biological requirement for dissolved oxygen due to the
metabolic degradation of the organic colloids in suspension
- easy mechanical removal of the colloidal portion on the SURFACE
(foam)
- less chance of mycotic infections in particular
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