Biological filtration

Bio elements 750 m2/m3

In aquaculture biological filters are used for nitrification and denitrification. We offer filters for nitrification as fixed and moving bed filters. Those filters can be used inside the loop of the Recirculation Aquaculture System (RAS) or in the effluent of a RAS or a Flow Through System.

Bacteria in biological filters need to settle on a surface. To provide as much surface per volume unit in a biological filter special bio elements are used. We use bio elements with a surface of 750 m2/m3. Due to their special shape their self cleaning is very efficient.

If you are directly looking for information on denitrification please click here.


Moving bed filters

A rectangular moving bed filter

In moving bed filters the bio elements are constantly moved with air. This results in a very good self cleaning and optimal oxygen distribution in the filter.

Moving bed filters can be used as round or rectangular filters. We usually build filters up to 10 m3 as round filter. Bigger filters are build with a rectangular footprint.

We deliver round filters completely equipped as plug and play units. When filters are build as rectangular units the customer takes care of the construction works according to our design. We deliver and install diffusors, grids and blowers afterwards.


Round moving bed filter

Our moving bed filters can of course be used to modernize existing facilities. They are a powerful tool for farm suffering from water shortage or strict regulations. With a biofilter water intake can be reduced with a stable or increased production.

Advantages of our moving bed filters:

  • Optimal flow
  • Energy efficient due to carefully chosen blowers and aerators
  • Short start up times
  • High degradation rates

Fixed bed filters

A fixed bed filter made in concrete

Fixed bed filters are used like moving bed filters for nitrification. They are especially used in farms with cold water. Besides the biological degradation fixed bed filterswork as a mechanical filter. Due to the structure of the fixed bed fine particles are kept inside the filter. Fixed bed filters need to be backwashed regularly.

Small fixed bed filters are build as round plug and play filters. Bigger filters are build in concrete by the customer according to our design. We deliver and install grids, diffusors and piping afterwards.

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