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A Trommel (from the Dutch word for drum,
"Trommel") is a screened cylinder used to separate materials
by size - for example, separating the biodegradable fraction
of mixed municipal waste or separating different sizes of
crushed stone.
Portable trommels (also called portable Trommel screens) are
often used in the production of organic products from
various types of waste.
For example, excavation contractors may screen their site
debris into two fractions; a saleable topsoil for farms,
nurseries and site-work, as well as cleaned rock for
aggregates or landscaping work. This allows the contractor
to resell their waste, instead of incurring the cost of
sending it for disposal.
The same principal applies to the production of compost,
sand, gravel, lumber mill by-products and municipal waste.
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