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biomass briquettes

a briquette may of compressed hay
Briquette made of compressed hay. Manufacturer: Ruf (Germany)
Picture source: Wikipedia

Biomass briquettes are a form of solid biofuel consisting of compressed, flammable biomass. Wood briquettes are a particular form of biomass briquettes produced from compressed sawdust. However, more generally, biomass briquettes may consist of a variety of different materials often derived from agricultural waste, including hay (see illustration), rice husks, bagasse, and groundnut shells.

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