Abstract
Coffee is one of the most popular beverages worldwide. The goal of this work is an estimation of the qualities of waste coffee grounds as a material used in biofuel production. There were selected two most popular coffee beans mixtures: arabica and arabica with robusta, as well as chocolate-flavoured coffee and green coffee (unroasted coffee beans). All types of coffee had approximately the same ash value its average oscillating between 2,59-3,21%. Calorific value of the dried waste coffee grounds after coffee percolation places it among very good energy materials
Highlights
Coffee is one of the most popular beverages worldwide
The process of drying waste coffee grounds left over from coffee percolation was conducted in constant conditions with air temperature Tp= 60°C±0.5°C
The popularity of coffee leads to the production of large quantities of coffee waste left over after percolation in many coffee houses in different towns and cities
Summary
Coffee is one of the most popular beverages worldwide. The content of stimulating substances and availability make coffee continuously popular. Between 2014-2016 nearly 3.8 million tons of green coffee beans were imported to Europe (in 2016 nearly 4 million tons were imported excluding Belarus and Georgia). The most important coffee exporters to the European Union were Brazil and Vietnam. A statistical citizen of the European Union drinks coffee infusion from 4 kilograms of coffee annually. In Scandinavian countries the consumption of coffee is the highest, in Finland 10.3 kg/person and in Sweden 9.2 kg/person. The smallest amount of coffee is consumed in Ireland (1.2 kg/person) and Great Britain (1.8 kg/person) according to the data for 2016. The data for Poland show that the consumption of coffee is below the average – 3.2 kg/person [2]
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