A large part of fish farming that has been carried out so far takes place at sea in large cages. The handling is increasingly questioned for a variety of reasons, which is why more and more fish farms are carried out in large pools in so-called RAS facilities (Recirculated Aquaculture Systems). Regardless of the cultivation system, the fish are fed with large amounts of feed pellets while also excreting feces, which has a negative impact on both the fish’s living conditions and the surrounding environment. Cultivation can take place in both fresh and saltwater and usually occurs at an elevated temperature. It has been shown that AxoPur is an extremely effective method for purifying water streams around fish farms for many applications.
When slaughtering and processing fish, whether it is farmed or caught in the sea, large amounts of water are used to wash and keep it clean. The process water used contains fat, proteins, and chemicals used in the process, and there is also a risk of various types of microbes that must be eliminated before the water can be returned to the recipient. A larger fish slaughterhouse can generate as much pollution as a medium-sized city, which is why purification is important.
Typical reductions of different categories of substances are presented below:
• Microorganisms: 90+%
• Suspended solids: 90+%
• Nutrients – Phosphorus: 90+ %