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The facility consists of two departments: Start-feeding and Grow-out. Each department has its own separate water treatment system, running on clean freshwater.

  
In addition to this, the facility has vacuum-run equipment for dead fish transport and a sludge treatment system to dewater the waste sludge. All the equipment is under observation via cameras placed in each department hall.



 

 

 



#### Major components:

  
The Kaldnes® RAS water treatment system consists of four major process components:

***Mechanical Particle Separation***

The Hydrotech™ drumfilters remove particles and suspended matter from the water, both from fish feed and fish feces

***Biological Filtration***

Dissolved and particulate organic matter and ammonia are degraded by bacteria and microorganisms in a two-stage Kaldnes® MBBR biofilter.

***Degassing***

Carbon dioxide produced by fish respiration is removed in a centralized CO2 degasser.

***Automation***

The entire facility, including the water treatment systems, lighting, oxygen and heat, is monitored and controlled by Veolia’s operating control system.

***Footprint***

The two Kaldnes® RAS systems together have a capacity of 1.556 kg daily feeding, with a total hydraulic capacity of 2.875 m3 /h. They occupy a footprint of 176 m2  (including the switchboard) which is a mere 12% of the total hall area.



 

 

 



####  

#### Key Data

| Parameter | Start-feeding | Grow-out |
|---|---|---|
| Total fish tank volume | 339 m3 | 1.272 m3 |
| Maximum biomass | 11.875 kg | 63.617 kg |
| Maximum feeding | 356 kg/døgn | 1.200 kg/døgn |
| Recirculating water flowrate | 675 m3/time | 2.200 m3/time |



   ![](/sites/g/files/dvc2471/files/styles/default/public/image/2019/02/Osland-diagram.jpg.webp?itok=Zb9c3FXU)   





 

 

 



 

 

#### Client: Osland Settefisk AS  
Startup: 2016

**Challenge:**  
To build a turnkey RAS facility with a highly constrained footprint.

  
**Solution:**  
Kaldnes® RAS consisting of Hydrotech™ Drumfilters, Kaldnes® MBBR, central CO2 degasser and circulation pumps. The facility is monitored and controlled by VA-operator, a fully automated control program



 

 

 

 

 

 





#### Design capacity:

**Production:**  
2,5 million smolt per year

**Maximum feeding:**  
356 + 1.200 kg per day

**Fish tank volume :**  
339 + 1.272 m3

**Operating conditions:**  
CO2 ut av kar: ≤15 mg/l  
TAN: ≤ 2 mg/l  
NO2-N: ≤ 0,5 mg/l  
NO3-N: ≤ 70 mg/l  
Nitrogen saturation: ≤ 100 %