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The Task at Hand
In countries where separate organics collection is not yet in place or only partially so, the production of “quality compost” from municipal waste is the only way to meet the demand for compost. Even where organics are source-separated, trash can get put in the wrong bins, and improper prior treatment can result in contraries like glass, stones and plastic getting into the material.
For Komptech compost preparation, the compost to be cleaned needs to be sufficiently cured or dry. Preparation starts with drum or star screening. The material is normally separated into an undersize fraction of 0-15 (20) mm and an oversize fraction. The undersize fraction is cleaned of contraries in one or more air separation steps, and then forms the product. Following cleaning by wind sifter, stone separator or a combination thereof, the oversize fraction can be returned to the rotting process.
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Process Steps
Screening
Processing starts with screening of the cured compost to the grain size specified by the customer. This can be done with stationary or mobile screen drums or star screens.
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Process Steps
Fines processing
Before the overlengths are returned to composting they should be as free of contraries as possible. The Stonefex, Hurrikan and Hurrifex are all suitable separators. Since the material is pre-screened they are all highly efficient. The choice of machine will depend on the kind of contrary in the oversize fraction.
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Process Steps
Fines processing
The undersize fraction that will become compost is cleaned of contraries by air separator table, consisting of a vibration plate with fine holes through which air flows. Thereafter it goes on to ballistic separation, which removes contraries like glass and stones, as well as light plastics thanks to the airflow.
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