Waste management

GERRI investigates issues of waste management with a holistic approach. Three central aspects are relevant: material systems and their characterization, single processes up to entire process chains as well as their modelling and assessment. Our understanding of materials and material systems is focused on anthropogenic deposits that carry potentials for valuable materials and are usually labelled as "waste". During the investigation and assessment of such systems, the formation of material mixtures and their influence on the down-stream technical process chains are taken into account.

GERRI can describe and assess the influence of preconditioning and sorting processes on different material systems both individually and in process chains. Our expertise also allows interface evaluations, e.g. between mechanical processing and the subsequent metallurgical process. Experimental setups from laboratory to pilot plant scale enables us to carry out application-oriented research and development.


Waste characterization


Since waste deposits are a mixture of different materials, it is necessary to characterize the waste in order to determine valuable fractions. The process-relevant particle size distributions are analyzed for bulk material or single particles using screening techniques and sensor based technologies. A multidimensional data base then enables the evaluation of further process steps for any kind of material mixture.

  • Portable continuous circular vibratory screen
  • Sensor-based technologies (optical, NIR, 3D)


Specific waste processing technologies


GERRI uses adapted technologies for screening and sorting processes. They can be used either for preconditioning waste materials or for the production of final products.

  • Drum Screen
  • Zig-Zag Wind Sifting


Waste processing chains


The Separation of valuable materials from waste streams is carried out in different process steps. Our competence is in the enrichment of metallic fractions, wether ferrous or non-ferrous, by the combination of different comminution and separation methods. These process chains enable the continuous recovery of metals.

  • Sieving / wind sifting / magnetic separation / eddy current separation
  • Comminution (impact mill) / screening / sensor-based sorting (XRT)


Mathematical modelling of material systems


Our model considerations and plant assessments result from an in-depth knowledge of the mechanisms of separation processes. Relevant data for different waste streams are empirically generated and transferred into mathematical models. Evaluations are carried out regarding technical and economic aspects such as efficiency, purity and yield of a single process step or the entire process chain.

  • Modelling and Assessment