Multi Media Sand Filter

Each individual sand filter consists of Five (5) different filtration layers. This design ensures a high dirt holding capacity with a reduction in multimedia channeling.

The five layers of multimedia are:

  1. Garnett pebbles
  2. Sand grains with a particle size of 4-9mm.
  3. Sand grains with a particle size of 2.5mm.
  4. Sand grains with a particle size of 0.6-1.2mm.
  5. Anthracite as a final deep penetration layer
  6. High-intensity conditioning.
  7. Liberation of valuable minerals from clay matrix.
  8. Washing plastic chips for recycling.
  9. Reaction vessels
  10. Soil washing - liberation of contaminants.
  11. Delamination or blunging of clays.

Advantages of multimedia versus cartridge filtration:

  1. The multimedia filter offers a three-dimensional filtration versus single dimensional filtration of cartridge filtration. This means that a multimedia filter can remove particles much smaller than its actual gap based direct impaction with the media. Cartridge filtration uses the pore size of the cartridge for removal in other words any particle smaller than the pore size will pass through the pore.
  2. Cartridge filtration units may require an additional high-pressurized vessel to force the captured particles off the filter media. This cost has to be added to the filter cartridge system price.
  3. The dirt holding capacity of any filter is limited to the amount of surface area. The multimedia filter has approximately 10000 times more filter area than the cartridge filters. This aspect ensures a greater dirt holding capacity.
  4. An increase in the dirt holding capacity leads to a reduction in the backwash fluid. This reduction, over a period, relates to a vast decrease in fluid loss and better recovery efficiencies.
  5. The capital cost of a sand filter plant is roughly five to seven times cheaper that a cartridge filter system.
  6. The operating costs of the multimedia sand filters are negligible for at least the first five years. In addition, the units can be manually overridden without affecting the process or its performance.

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