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The Task at Hand
In an 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.
The goal is to stabilize the organic content and bring it into disposable condition, while preparing the remainder for thermal and material reclamation.
The biological treatment takes place anaerobically (anaerobic digestion) or aerobically (composting). The details of the processing line are configured for the specific customer’s input materials and sales venues for the output fraction.
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Process Steps
Mechanical - 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.
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Process Steps
Mechanical - Separation of fines
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.
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Process Steps
Further mechanical process
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.
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Process Steps
Biological - Rotting phase
The ejected 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 fermentation technologies.
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Process Steps
Biological - Compost treatment
To make compost, the material can be screened after the rotting phase using a stationary or mobile drum or star screen. If necessary, the screen overflow can be cleared of contraries using a Hurrifex, Hurrikan or Stonefex (see also Final compost treatment).
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