The COLDEP process resolves the main technical limitations encountered by shellfish purification systems in shellfish farming facilities:

  • Presence of bacteria and viruses in the water.
  • Abundance of small particles <30 µm which are not captured by conventional filters and reduce the effectiveness of UV treatments.
  • Decrease in dissolved oxygen concentration in water.
  • CO accumulation2 dissolved in water.
  • Energy cost of the solutions implemented to solve these problems.
particulate extraction - Compatibility - biosecurity

Shellfish water purification

The microbubbles created in the system trap impurities as they rise and create a scum at the top of the column. This scum which is sucked up by the vacuum carries with it the particles which are trapped inside. These extracted particles are between 0.3 and 30 µm and are not trapped in conventional systems.

Minimum size of the particles extracted

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Transmittance indicating water clarification

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Reduction of bacterial load

Quantité maximale de coquillages traités par une VAL1400 sur 200 m³ d’eau

Maximum energy consumption per m³ of treated water

less viral load

Particulate extraction by the COLDEP system also allows bacteria and viruses to be trapped, thus ensuring the biosecurity of the installation.

The clarification of the water also makes it possible to guarantee optimum UV efficiency, coupled with the extraction function which eliminates the degraded particles that the UV and ozone treatments neutralize but leave in the environment.

There is the possibility of extracting continuously or only a few hours a day.

Dissolved gas management

Regulation of O concentration2 and co2

The bubbles associated with the vacuum created at the top of the column make it possible to achieve unmatched aeration and degassing efficiency.

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Minimum oxygen saturation level

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Reduction of the quantity of CO₂ in a single pass

The opinion of professionals

Testimonials

Our new building comprises 230 m3 shellfish purification tanks, for a total volume to be treated of 430 m3 retrieved directly from the Thau lagoon. The initial plans included conventional pump technology, sand filters and UV treatments. Exchanging this set for the only COLDEP device allowed us eight times less electricity consumption, and superior water quality performance both in filtration and purification and in oxygenation.
Guy Sanchez

General manager, GUY SANCHEZ OYSTERS