Osland Settefisk

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.


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


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


The two Kaldnes® RAS systems together have a capacity of 1.556 kg daily feeding, with a total hydraulic capacity of 2.875 m/h. They occupy a footprint of 176 m (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



Client: Osland Settefisk AS
Startup: 2016

To build a turnkey RAS facility with a highly constrained footprint.

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:

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 %