Member of proweps engineering association proweps GmbH ( and proweps envirotec GmbH

Waste recycling

Municipal solid waste (MSW) includes indeed a high percentage of organic fraction but also valuable resources that can be recovered in mechanical sorting plants. In addition to the recovery of raw materials, the treatment of the organic fraction is of central importance in order to avoid the emission of climate-damaging gases caused by the biological decomposition of organic constituents on landfill sites. The organic fraction of MSW can be used sensibly by anaerobic digestion to produce renewable biogas. If both technologies are combined it is a so-called Mechanical-Biological-Treatment plant (MBT plant).

It is technically possible to separate from MSW following in mechanical sorting plants raw materials as:

• Plastic (PP, PS, PET, PE, HDPE, LDPE, PVC etc.)
• Glass
• Paper
• Cardboard
• Fe-metals
• Non-Fe-metals

For the technical solution it is important to identify the markets for the recyclables and the expected revenues.


The mechanical sorting of MSW includes different process elements:
• Crushing
• Screening
• Ballistic separation
• Wind shifting
• Optical sorting
• Fe-Metal separation
• Non-Fe-Metal separation
• Pressing of recyclables

The intelligent combination of technically sophisticated individual processes enables the separation of municipal solid waste characterized by a very heterogeneous composition, into high-quality material flows that can be recycled and are returned to the material cycle. As a result, limited available raw materials on the market and fossil fuels used for the material production can be saved. Efficient mechanical sorting systems ensure high recycling rates of MSW and contribute significantly to landfill diversion.

Today, modern mechanical sorting systems of MSW already fulfil important functions in environmental and climate protection in many respects.

Example of a completely automatized mechanical sorting plant:

Our services

We support our customers in the planning and realization
of MSW sorting plants in many ways. These include:
• Feasibility studies
• Clarifications of interfaces to organics treatment plant
• Tender documents for technology procurement
• Supplier bid evaluation
• Preparation of documents for approval procedures
• Engineering
• Supervision of installation and commissioning