Water Recycling

The Kingfisher BioReactor System consists of four basic components, circulation pump, primary filtration, secondary filtration and biological filtration. Further options can be added in the form of ultra violet (UV) sterilisation, degassing, heating and cooling systems. The BioReactor has the ability to operate by pumped intake with gravity return or gravity intake with pumped return, thus restricting the pumping processes to one, unlike some other systems. It also operates successfully with both fresh and sea water.

Water from the fish enclosures is passed initially through a drum filter fitted typically with a 40µ screen. The partially filtered water is then passed on into the first stage of the BioReactor chamber, the foam fractionator, to further reduce the level of suspended matter. Dissolved oxygen levels are boosted during this process as a beneficial side effect.

The water then enters the fluidised bed stage of the BioReactor, where the main biological activity occurs. The media, which has a surface area of 500m2 per m3, has a density slightly less than that of water and is maintained in suspension by diffused air. Residence times, media levels and air flows are all calculated using feed rates, fish size and biomass levels. Due to the unique design of the plastic media re-fluidisation from a static state is both simple and total in its action. Excessive build up of bio-slime is prevented, and the need for maintenance is eliminated. Oxygen levels remain high due to the continued use of diffused air.

The clean water is finally returned to the fish enclosure, or passed on for degassing, UV treatment or heat recovery / cooling as necessary. Thanks to the unique modular design of the system, almost any size of BioReactor can be manufactured to suit requirements.