Branches and tops from harvested trees are often called "GROT".
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When branches and tops of trees are harvested for creating fuel, the material is called "GROT" (after the Swedish acronym: GRenar Och Toppar, i. e. branches and tops)
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GROT is usually processed into small chips that afterwards become a ready-to-use fuel which is processed in a chipper or a grinding mill.
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The finished fuels processed in a chipper are called "dry chips".
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When evaluating GROT handling we should bear in mind that a ready-to-use fuel is produced in the forest and part of our goal should be to prepare a fuel in which microorganisms grow as little as possible.
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Microorganisms are found everywhere and always cause a problem.
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Levels of microorganisms, and thus potential consequences of exposure to them, are somehow linked to GROT handling.
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Storing chips containing a large amount of bark, leaves and twigs can result in appearing large amounts of mold within a couple of weeks. It is, therefore, recommended to dry the chips prior to mold developing. If you dry chips that have been attached by mold, it will become less dangerous the drier they are.
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One of measures for reducing levels of microorganisms is that biofuel with visible signs of mold should not be brought into an indoor work site for handling.
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Another measure for reducing levels of microorganisms is bundling GROT (pressing it into so-called GROT logs), which creates more dust during further handling.