The waste from land based farms is handled in accordance with guidelines for the different local areas. The guidelines are determined by the authorities based on the local conditions such as coastline, the impact on the fauna from the discharge water, weather and wind conditions. AKVA group´s teams of engineers and biologists are always ready to support customers in identifying the most efficient and reliable treatment technologies to meet the requirements stated.
To minimize the discharge from land based fish farms, we have introduced the zero water concept (ZWC) connected to our recirculation aquaculture systems (RAS). This technology brings down the nitrate and phosphorous levels and reduces the water consumption by 99%. The technology also makes it considerably easier to retain all sludge and treat the effluent water in a waste water treatment plant (WWT) to meet the consent levels permitted. The accumulated sludge can be used for soil improvement and fertilizing or for biogas and biodiesel.