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Gone are the days when coffee grounds were read to tell fortune – they are now processed into new products

Coffee grounds. / flickr

"That's too good for the garbage," my grandma always shouted when I wanted to throw away coffee grounds. The brown sludge should nurture the roses in the garden. It proves to be a high-quality fertilizer. This is a good use of the waste for coffee drinkers with a garden, at best also for restaurants in a city with compost production. But what to do with the estimated 7 million tonnes of coffee grounds that are generated worldwide every year? In many places it rots away on landfills and releases methane that is harmful to the climate.

Why it is interesting. In recent years, resourceful minds have come up with various ideas for putting coffee grounds to good use. Apart from nutrients such as nitrogen, phosphorus and potassium, it also contains plant fibres, proteins and coffee oil.

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