The core of today's aquaculture industry is the water used to incubate eggs and raise fish larvae
The abundance and purity of water continues to decline, while concern about diseases found in water sources continues to increase.
Simultaneously, increased fish consumption has led to a growing demand for higher stocking densities in the same farming facilities.
Fish farms and breeding facilities are evaluating ways to improve the quality of their water at source, while compensating for quantity losses.
through the implementation of water recirculation systems (RAS).
This is leading more fish farms to install sophisticated water treatment systems to improve water quality and balance the needs of
water due to the lower availability of water in natural sources.
Most common applications
Desinfection
This is the most common application of UV in water treatment. A fish breeding and fattening plant requires disinfection and filtration systems.
at various locations along the water line.
UV systems are installed after any other treatment technology used to improve water quality (e.g. filters, degassers, etc.),
just before water comes into contact with fish eggs in a rearing or breeding facility. UV equipment can also be used in
the recirculation circuits of the breeding facilities and in the effluent circuit generated in the activity itself (increasingly common in some regions).
UV systems significantly reduce pathogen counts in hatchery and rearing facilities and have proven to be the go-to disinfection technology
most cost-effective for the inactivation of various types of bacteria, viruses and parasites harmful to many species of fish.
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Ozone Destruction
Ozonation is often used in a fish hatchery to improve the quality of problematic water sources used in the hatchery stages.
and fish farming.
However, residual ozone in water can be extremely toxic or fatal to aquatic life being cultured. To ensure that the fish
are not exposed to residual ozone, one of these two removal processes is usually used: the first is an ozone degasser (column
which expels ozone into the atmosphere); This method may not be the best design based on its toxic effect on the environment. The second method
It consists of applying 254 nm UV energy to consume residual ozone in the water flow before coming into contact with fish.
A certain dose of UV will need to be applied to consume residual ozone levels in the water. A common dimensioning for the complete
elimination of up to 1 ppm of residual ozone concentration would be a UV dose of 90 mJ/cm2. UV energy 254 nm breaks down the ozone molecule,
generating oxygen as a byproduct, which is a benefit for the fish.
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Primary Filtration
Our compact and highly efficient rotating belt filter technology is installed in aquaculture plants around the world, offering customers:
- High TSS removal (40 - 90%, depending on design).
- High removal of organic particles (COD/BOD).
- Integrated sludge thickening and dewatering (2 - 30% dry sludge, depends on design and adjustment).
- Gentle filtration that does not crush particles.
- Flexible system configuration.
- Complete system automation with screen controls.
- Quick and easy maintenance.
- Low operating costs.
- High quality parts and long machine life (316 stainless steel).
- Quick access to spare parts and technical support and service.
Hatcheries and fish farms:
In hatcheries and fish farms, solids can appear in the water from fish waste and uneaten food. In large
quantities, these solids have a negative impact on the growth and survival rates of fish, as they demand oxygen and contaminate the water with
ammonia. A Salsnes filter system can effectively remove these solids (without crushing them like a typical drum filter) to maintain high filter quality.
water for fish.
Sea lice:
Sea lice are tiny parasites that attach to the skin, fins and gills of fish. Infestation can occur anywhere:
along coasts, around fish farms, on ships carrying live fish and in slaughterhouses. The most commonly used treatment methods only
They temporarily neutralize sea lice, allowing for future infestations.
A Salsnes filter system separates sea lice (and their eggs) from the water for proper disposal. Almost 100% reduction in sea lice improves
water recirculation, which results in a higher fish survival rate and contributes to reducing operating costs.
Processed:
The composition and strength of slaughterhouse wastewater poses many treatment and discharge problems for these facilities. It has great
volumes of difficult-to-filter components, such as blood, dirt, manure, and grease, oil, and grease (FOG).
The Salsnes Filter system can separate these components thanks to the design of the filter mesh. First, the fiber and grain of the excrement are collected in
the filter mesh. These larger particles begin to collect smaller particles to create a "filter blanket". Separation performance
improves as particles continue to accumulate on the filter mesh, creating progressively smaller holes that retain particles each time
smaller.
Another important characteristic for slaughterhouses is the speed of separation of solids to prevent proteins from biodegrading into ammonia and phosphorus.
dissolved. Less dissolved protein reduces the cost of biological treatment and produces less excess sludge to dewater.
