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Coffee husks are mainly composed of carbohydrates. like cellulose, hemi-celluloses and lignin; they contain protein, lipids, minerals, caffeine, tannins and potassium.
current disposal methods
The main disposal process remains landfill or simply dumping raw husk into rivers and waterways.
In production of coffee, about 50% of the harvested coffee is husk which contain biogenic substances. Caffeine and tannins make it toxic and inhibit root growth. Carbohydrates lead to an increased methane emissions through decomposition especially when disposed or burned in uncontrolled ways. When dumped into surface waters, most of the hydrophobic compounds, like oils, lipids, triglycerides and fatty acids remain as do insoluble carbohydrates like cellulose and various indigestible sugars; those are very harmful for surrounding water bodies, human health and aquatic life. In fact, people residing in the vicinity of coffee farming industries that are utilizing the river and stream water for domestic purposes often suffer from severe health problems.
some technical data
volatile carbon content