Energy optimized design of fish farms

The fish farming industry has adapted to stricter environmental requirements by changing operations to partial or total recirculation of farm water. The project carried out theoretical analyses and practical tests with improved energy-saving operation concepts to prevent increasing electricity consumption for water oxidation, treatment and degassing. Farm water only absorbs 2-5% oxygen when conventional aeration technologies are used and the potential energy efficiency improvement is thus immense. The widely used mammoth pump principle should be optimised, e.g. by applying a propeller pump to move the water and a low-pressure diffuser for aeration.