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Efficient separation into different fractions

Preparing construction waste with the aid of Doppstadt: Perfectly combined complete systems for lower disposal costs.

Preparation of construction waste

Rising landfill costs, more stringent legal restrictions on disposability and the ever-increasing demand for secondary raw materials of good quality call for innovative solutions to recover valuable products from mixed construction waste.

The processing equipment from Doppstadt takes these boundary conditions into account with its high-performance technology and the wide variety of possible combinations – and reliably separates non-recyclable fractions from waste that can either be recycled or used as refuse derived fuel.

Mixed construction waste is generated with every demolition, renovation or construction site. It cannot completely be disposed of in landfill due to its organic content. Thermal disposal on the other hand is too expensive due to the high mineral content. That is why it is necessary to first separate the waste by density so that inert material can go to landfills while combustible material can be utilized effectively. Doppstadt offers different separation processes that are combined into an individual package solution that effectively separates the material into 

  • Refuse derived fuel (plastic films)
  • Plastics and wood for utilization as an energy source (lightweight fraction)
  • Stones and metal (heavy fraction)

The processing of mixed construction waste with Doppstadt offers 

  • Lower disposal costs
  • Reliable separation of fractions into combustible and inert components
  • Mineral components can be crushed and used as recycled gravel

Our comprehensive consulting services are based on many years of experience, thus guaranteeing the perfect solution for every material stream. A solution that includes the reliable Doppstadt service as well.

Contact us now for your optimum recycling solution!

Processing Mixed Construction Waste

The process of treating construction waste consists of a screening machine, wind sifter, sink–float separation and water treatment. The screening machine serves to separate the fine particle fraction and thereby reduces the amount of sludge produced later in the process. The oversize is further separated according to density. First, foils are removed with the help of a wind sifter. These can then be burned for energy recovery. The heavy fraction is transferred from the wind sifter to the sink–float separation system, where it undergoes further density separation using the density of water.

The heavy stones and metal parts are discharged and can be further separated by magnets. The light pieces of wood and plastic are washed and can then be burned for energy recovery in a similar way to the foil fraction. For continuous operation of the sink–float separation system, a lamella separator is needed to treat the process water for recirculation. Here the sediments have time to settle down, without the need of a big settling basin, which would take up a lot of space.

Mixed construction waste cannot be disposed on landfill because of its organic components. Thermal disposal on the other hand is too expensive. That’s why it should first be separated according to density so that inert waste can be dumped and combustible material can be burned for energy recovery.



Plastic and Wood

light fraction


heavy fraction

The process at a glance

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