Fresh water
Schematic overview of a recirculation system for freshwater fish:
- Fish basin
- Drum filter to remove all particles > 30 micron
- Rinse water pump which rinses with system water
- Water storage sump under drum filter and trickling filter
- Pump to rotating nozzles above trickling filter; 100% of water flow which means approximately 1 to 1.5 times per hour all water in basins is treated.
- Trickling filter is a biologic filter that’s removes NH4 and NO3
- Heat exchanger on intake water
- Pumps to bring water to fish basins (eventually by-passing O2 reactor)
- Oxygen reactor to bring water on over saturation with Oxygen
- Pump to up-flow filter and UV unit; approximately an extra 15% of water volume is filtered by this unit per hour
- Up-flow filter; to remove smaller particles and also for nitrification
- Ultra violet unit to treat all the water from Up-flow at least 1x per 6 hours all system water is treated by up-flow and UV.
- Sump to store all waste water from drum filters and up-flow filters
- Pump in waste water sump to de-nitrification tower and waste water treatment unit
- De-nitrification filter with ethanol dosing pump
- Mixing unit to bring polymer and iron chloride in the system to get flocks of dirt
- Belt filter to split “cleaned waste water” from the sludge
- Storage of “dry sludge” and cleaned waste water for discharge
- Intake of new water to replace waste water and evaporation
- Submerged heat exchanger in sump or in water supply to fish basins
- Heating unit
- Ventilator on top of trickling filter to de-gas and ventilate building and filter.
- Pure Oxygen from storage tank or O2 generator
