Methods for particle removal in fish farming
Several principle and methods are used to remove particles from a water flow. These can be classified as follows:
· Mechanical filtration, also called straining or micro screens
· Depth filtration, also called sand filtration or just filtration
It is also possible to use other methods to remove particles, such as flotation, membrane filtration and ozonation. These methods are normally utilized for removing smaller particles and are usually too expensive to use in aquaculture facilities, perhaps with the exception of water supplied to small fry, such as for some marine species.
Regardless of the method chosen, method it is important to remember that all filter systems will cause a head loss. This can be quite high, for instance when using pressurized filters on the inlet water, with the loss depending on the principle employed. Acceptable head loss is therefore an important criterion when selecting an appropriate filter.