Ken Hilderbrand (ken.hilderbrand@hmsc.orst.edu)
Wed, 24 Nov 1999 09:56:18 -0800
Dipak,
Scales, skin/bone, and gut/head waste can be made into fish meal using
standard technology. They can also be hydrolyzed into a liquid using
enzymes, then spray dried into animal feed . With enzyme hydrolysis and acid
stabilization, or acid hydrolysis alone, they can be made into fertilizer.
They can be tilled directly into the soil as fertilizer or composted with
wood (or other) waste carbon bulking materials. The technologies can be
summarized as follows:
CAPITAL INVESTMENT TECHNOLOGY COSTS
MARKET
meal high high
high good to excellent (but varies)
spray dried
liquid feed high high
high good (assuming spray dried)
liquid fert. moderate moderate
moderate fair (depends on location)
compost low low
low developing (depends on location)
field tilling very low very low
very low depends on weather/season/location
All of the above have some environmental concerns and may be regulated by
government for various emissions. As it turns out, in some circumstances,
composting fish waste with wood (and other) waste can be the most profitable
when all costs are subtracted from revenue. But an analysis of the best use
of fish waste must be site and species specific as mentioned by others who
have responded to your question.
There is little use of water effluent from mechanical fish processing
operations. Irrigation on crops might be possible in some locations but
environmental laws will restrict most applications. The best way to dispose
of liquid effluents is to screen out solids and discharge into a marine
environment in such a way as to not degrade water quality. Environmental law
will still apply in most countries of the world. Some locations will require
primary treatments such as flocculation and air flotation
Ken H
Kenneth S. Hilderbrand Jr.
Seafood Processing Specialist
Sea Grant Extension Program
Oregon State Univ. Marine Science Center
2030 Sth Marine Science Drive
Newport, Oregon 97365-5296 USA
phone: 541 867-0242
fax: 541 867-0138
email: <ken.hilderbrand@hmsc.orst.edu>
-----Original Message-----
From: owner-seafood@ucdavis.edu [mailto:owner-seafood@ucdavis.edu]On
Behalf Of Dipak,Chaudhari
Sent: Tuesday, November 23, 1999 10:28 PM
To: 'Andrew Strak'; 'Seafood List'
Subject: Fish meal/Oil
Dear Group
We have a surimi plant and we generate huge quantities of waste. I am
interested in converting this fish waste to some useful product which is
basically
1. Sclaes
2. Skin/ bone
3. Gut and head waste
4. Effluent
Can some one throw some light on how this can be done?
Dipak
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