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The Application of Ozone in Aquaculture

Views: 232     Author: Site Editor     Publish Time: 2021-01-28      Origin: Site

Ozone (O3) is a very effective disinfection agent and can be used in aquaculture / fish farming to replace chlorine and bromine containing disinfection chemicals. Using ozone disinfection can prevent the formation of chlorine or bromine containing byproduct, like chloramines and trihalomethanes.


Aquaculture involves commercial fish culturing in tanks or enclosures. It plays an ever increasing important role in supplying the world's demand for fish. To effectively meet this demand, fish farms must practice intensive farming techniques. Of course, as the fish density grows, the risk of infection by water-borne bacteria and viruses increases.


Because of these problems, some aquaculture operators frequently use strong antibiotic drugs to keep the fish alive (but many fish still die prematurely with a rate of up to 30 percent). In some cases, these drugs will enter the sewage and pollute the environment.


Additionally, the residue of these drugs in human food products has become controversial. However, most fish farming operations still use antibiotics, many of which considered to be a serious problem to human health and for fish farming. Ozone is the ideal disinfectant for aquaculture to kill bacteria and viruses without leaving any residue. So ozone disinfection technology is widely used.


Using ozone in aquaculture water treatment projects has the following purposes.



1. Removal of Fine and Colloidal Solids

Fine and colloidal solids consist of particles with 1-30 microns and 0.001-1 microns respectively. The small size of the particles enables the solids to remain in suspension and avoid using most mechanical methods of separation. The accumulation of fine and colloidal solids can impair bio-filter nitrification efficiency and endanger the fish culturing. Ozone purification technology can remove fine and colloidal solids by removing clumping of the solids, which facilitates removal by foam-fractionation, filtration and sedimentation.



2. Removal of Dissolved Organic Compounds

Dissolved organic compounds or refractory organics give the water a characteristic tea-colored stain. Dissolved organic compounds are non-biodegradable and accumulate according to feed input, water exchange rate and the rate of solids removal. High levels of dissolved organic compounds can stress fish and reduce nitrification efficiency of the bio-filter. However, using ozone disinfection technology can solve  this problem, it can effectively remove dissolved organic compounds.

66-2-ozone disinfection technology

3. Removal of Nitrite

Nitrite can accumulate as production intensifies and organic matters on the bio-filter increase. Bacteria that process ammonia into nitrite (Nitrosomonas spp) operates more efficiently under high organic loading than those that process nitrite into nitrate (Nitrobacter). High levels of nitrite can be toxic to fish. According to the data of Bidyanus bidyanus, nitrite content as low as 2.8 parts per million (ppm) can reduce the growth of fingerlings by 5%.


4. 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, including RAS and flow-through hatchery systems, are also interested in reducing the pathogen load introduced by treating the source water. The disinfection of waste water before introduction to the environment is also crucial to prevent the 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.


In addition to aquaculture water treatment, ozone can also be used for domestic water treatment and sewage treatment. When carrying out ozone sterilization and disinfection, it is very important to have a suitable ozone generator. We are a company dedicated to ozone technology application. We can provide you a suitable and efficient ozone generator.

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