Recycle Food Waste by Dewatering

Recycle Food Waste into Biopulp

A bigger part of household waste can be recycled and used as organic "energy soup" (bio-pulp) for degassing at biogas plants. The “energy soup” from food waste is used to create sustainable energy. The technology to separate waste from food and organic material is developing and trying to find the best possible solutions and by this optimizing the biogas plants.

To be able to refine the organic part of the household waste it is send through a system where large amounts of water is added to separate the organic material from the plastic and other materials. This plastic reject and other non-organic materials are after this process a waste product with high water content. The wet reject is very expensive to transport and dispose of, or send to incineration and RUNI has the solution

Dewatering Food Waste with RUNI Screw Compactor

The installation of RUNI SK370 as a food waste compactor or as a machine for depackaging food waste in the line, reduces the water content significantly and the weight of the waste is reduced with more than 50%. Furthermore, a few extra percent of the organic material is collected from the waste and can be added to the “energy soup” for the biogas.

Producers of biopulp from food waste optimize their plants significantly with this solution, as they can reuse the dewatered water in their system and save money on transport and disposal of the left waste. Dewatering food waste also reduces both the volume and weight of the reject, which saves you money on transportation and disposal.

The RUNI Solution for Food Waste

RUNI SK370 screw compactor has for many years proved to be a strong and reliable machine, that is designed to work 24/7 with a capacity of 2000 kg food waste reject per hour. When dewatering reject from food waste, the RUNI normally achieves up to 50 65 % of dry matter.

Case with Dewatering of Food Waste

Haith recycling, Great Britain 


  • How does a food waste compactor work?
    When handling food waste, the compactor squeezes the bio liquid out of the waste, to gain as much biogas as possible from the food waste.
  • Is there any food waste you can not put in a compactor?
    The food waste compactor handles liquefied food waste, usually together with packaging or plastic bags.

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