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Wet Organic Fraction

Any item under 70 millimeters that leaves the residential waste separation plant is considered Wet Organic Fraction (WOF). This stream is often deposited directly into a digester for biogas. However, WOF still contains some valuable materials. For example, plastics make up around 3% of WOF.

The moisture content of WOF is 50%. Any solids in the fraction can be separated using a sieve. The gas yield of the fraction smaller than 6-8 mm is low. Drying this fraction can reduce the mass by 50%. A further upgrade of this fraction is possible.

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The 6-70mm fraction contains many 2D deformable materials. Wind shifting separates the foils and paperĀ from the 3D materials, such as plastics, wood, stone, glass, metals and nonferrous materials. After the iron is removed from the 3D materials using magnets, the plastic is removed using Near-Infrared (NIR) scanners.

What remains goes into an X-tract, a radiation machine that recognizes material at the molecular level using X-rays and infrared. Stone and glass are removed based on their permeability. The organic fraction that remains goes into the digester and ensures a high gas yield.

Stone fraction can be sold as a raw material. The glass is delivered with a purity of more than 95% and is suitable as a raw material for the glass processing industry.

A separation plant for WOF can be customized, designed and implemented with a processing capacity of 5 tons/hour to 40 tons/hour.

Read our customer case: Omrin