Aquaculture

The Viriditec Sanitation Solution™ is an all powerful solution to the many day-to-day odor problems. Ozone can be used in aquaculture water treatment projects for the following purposes:

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Fish Farming

Ozone use can keep water cleaner and fish healthier. Healthier fish take on feed faster which leads to increased growth. Use of ozone in these applications has shown a great return on investment. Ozone is widely used in the treatment of water in aquariums and fish ponds. Its use can minimize bacterial growth, control parasites, eliminate transmission of some diseases, and reduce or eliminate “yellowing” of the water.

Removal of Nitrite

Nitrite can accumulate as production intensifies and organic loadings on the bio-filters increase.

Ozonation – a process of infusing water with ozone – can be used in aquaculture to facilitate organic breakdown. Ozone is also added to recirculating water systems to reduce nitrite levels through conversion into nitrate. If nitrite levels in the water are high, nitrites will also accumulate in the blood and tissues of fish, where it interferes with oxygen transport (it causes oxidation of the heme-group of haemoglobin from ferrous (Fe2+) to ferric (Fe3+), making haemoglobin unable to bind to O2.)

Removal of Fine and Colloidal Solids

Fine and colloidal solids consist of particles 1-30 microns (m m) and 0.001-1 m m respectively. The small size of the particles enables the solids to remain in suspension and avoid most mechanical methods of separation. The accumulation of fine and colloidal solids can impair bio-filter nitrification efficiencies and stress fish stocks.

Ozone removes fine and colloidal solids by causing clumping of the solids (microflocculation), which facilitates removal by foam-fractionation, filtration and sedimentation.

Removal of Dissolved Organic Compounds

Dissolved organic compounds (DOC’s) or refractory organics, give the water a characteristic tea-colored stain. DOC’s are non-biodegradable and accumulate according to feed input, water exchange rate and the rate of solids removal. High levels of DOC’s can stress fish and reduce nitrification efficiencies of the bio-filter.

Ozone removes dissolved organics by: oxidation into products that are more readily nitrified in the biofilter; including precipitation, which enables removal of waste particles by conventional filtration or sedimentation.

Disinfection

The high stocking densities, associated fish stress and increased nutrient loads found in RAS create an ideal environment for fish pathogens. An important step in reducing the risk of disease outbreaks in RAS is the use of standard quarantine procedures for any fish introduced. Facilities using surface waters, including RAS and flow-through hatchery systems, are also interested in reducing the pathogen load introduced via the source water. The disinfection of effluent waters before introduction to the environment is also crucial to prevent the translocation of exotic diseases.

Ozone can effectively inactivate a range of bacterial, viral, fungal and protozoan fish pathogens. The effectiveness of ozone treatment depends on ozone concentration, length of ozone exposure (contact time), pathogen loads and levels of organic matter. If high levels of organic matter are present, the demand created by oxidizing the organic matter can make it difficult to maintain enough residual ozone for effective disinfection. O3Canada can design systems for a wide range of applications.

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Ozonated Ice

After fish are harvested they are typically stored on ice. Another great use of ozone is ozonated ice. By dissolving ozone into water and quickly freezing it, ozone is essentially trapped within the ice.

Ozone is an excellent antimicrobial agent, and is commonly used to extend shelf life of many food products. By locking ozone into the ice, and placing fish on this ice, the benefit of ozone is slowly released to extend the shelf life and improve the quality of your fish while storing and shipping to your end user.

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