Mixed waste
MBT plants
In a MBT (mechanical-biological treatment) plant mixed waste streams are treated by mechanical means such as shredding, screening and separation, as well as by biological processes.
Start with
shredding
Process starts with a Terminator shredder, with shredding performance configured for the input material. The goal of this step is to homogenize the input stream, and open up bags and packages. The contrary resistance of the shredder lets it take in a wide range of input materials, while the even feed ensures a consistent supply of shredded material to the downstream process steps
Separation
of organics
Since the largest organic content is in the fine fraction, screening is the first step after shredding. The resulting organic fraction is sent to biological preparation. The machine used is either a stationary Komptech drum screen or the Flowerdisc disc screen.
Further
recycling steps
The oversize fraction is put through screening and separating to generate various kinds of RDF and recycling fractions. The nature of the starting material will largely determine whether this mechanical process step is focused more on producing RDF, separating out recyclables or a combination.Â
Biological
tratment
The organic fraction is piled into triangular windrows by wheel loader. Regular turning with a Topturn compost turner supplies the process with air and water if necessary. This accelerates composting. The windrow technique can be supplemented by a closed composting tunnel or anaerobic digestion technologies.
Final compost
treatment
To produce compost, the material can be cleaned after the rotting phase using a stationary or mobile screening and separation technologies. The screen overflow is cleared of contraries using wind sifters.Â
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