Design, manufacture and distribution of airlift vacuum columns: water treatment, circulation and degassing
Fish Farming
The COLDEP system solves the main technical limitations encountered by recirculating water in fish farms:
Decrease in oxygen level
Water acidification due to too much dissolved CO2
Abundance of small particles <30 microns, which are not captured by conventional filters and reduce the effectiveness of UV treatment
Energy cost of solutions implemented to address these issues
Dissolved gas management
Air bubbles associated with the vacuum created at the top of the column can achieve unparalleled efficiency in aeration and degassing:
Oxygen levels are kept above 80% saturation
More O2 can be injected in the column downflow with 100% dissolution
In a single passage of water in the column, the amount of CO2 is decreased by 30%
One system can manage the gases produced by a feeding of 50 kg / day
Energy consumption is between 5 and 10 W.h / m3 of treated water
Particles Extraction
Micro-bubbles generated in the system trap the particles in suspenson while rising and create a froth at the top of the column. This foam is sucked out with the particles by the vacuum and so extracted:
The extracted particles are between 0.3 and 100 microns and aren't trapped by the conventional systems
Particles can be extracted continuously or only a few hours a day
Energy consumption is between 10 and 15W.h / m3 of treated water
Biological filtering
The latest tests conducted with IFREMER show that on top of particles, the COLDEP system also traps bacteria and viruses:
The amount of virus in the water is divided by 100
