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use of finer mesh screens (down to 0.15 mm) to separate solids form the
wastewater liquid stream.
The above measures can reduce the organic loading from a fish processing facility by
approximately 50 to 60 %
6.4 By-Product Recovery
By-product recovery is a cost effective way to reduce the amount of waste that would,
otherwise, be disposed of. There are numerous ways for by-product recovery in the fish
processing industry (as outlined in Section 5.4), such as production of:
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fish meal;
pet food;
fertilizers;
fish silage;
protein hydrolysates;
chitin and chitosan;
food flavours;
bone meal;
bait;
fish scales.
The predominant commercial use of fisheries waste in Canada is fish meal production.
On the West Coast, fish meal is manufactured primarily in the Lower Mainland followed
by Prince Rupert and Port Hardy.
6.5 Wastewater Treatment
Although there is a wide variety of wastewater treatment technologies (Section 5.3), the
only type currently economical for the fish processing industry is fine screening (mesh
size 0.5 mm or less) followed by a deep water discharge. The most widely used screens
in the fish industry include tangential and rotary screens.
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