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In modern life conditions, when emphasis is on environmental protection and sustainable development, fuels produced from biomass are increasingly gaining in importance, and it is necessary to consider the quality of end products obtained from biomass. Based on the existing European standards, collected literature and existing laboratory methods, this paper presents results of testing individual thermal - chemical properties of biomass energy pellets after extrusion and cooling the compressed material. Analysing samples based on standard methods, data were obtained on the basis of which individual thermal-chemical properties of pellets were estimated. Comparing the obtained results with the standards and literature sources, it can be said that moisture content, ash content and calorific values are the most important parameters for quality analysis which decide on applicability and use-value of biomass energy pellets, as biofuel. This paper also shows the impact of biofuels on the quality of environmental protection. The conclusion provides a clear statement of quality of biomass energy pellets.

The motivation for this study is the disagreement of statistical and literature data about potential quantities of biomass in Serbia. This difference is mainly caused by changed status in practice due to several reasons: changes in ownership caused by transition, different application of technologies in practices, organization of work and economic reasons. The main aim is to precisely establish sorts and amounts of organic biomass in Serbia that can be transformed into heat and electricity. So far, data about the quantities of biomass residues in agriculture, forestry and communal services have been collected and published. Data collection methods are different and generally based on statistical data. The paper explains in detail methods of data collection and processing of crop production, fruit growing and viticulture, livestock, forestry and communal services. On the basis of precise data collection, it has been established that there are 26.3 million tons of biomass residue in Serbia every year. The total amount of biomass is reduced by 20-30% in relation to the period of 10 and more years ago. On the basis of the situation in agriculture and forest production in Serbia, it is estimated that out of the total amount of biomass, some 30-40% can be used for the production of heat energy, electricity and biofuel. The remaining biomass can be used in order to increase soil fertility, as cattle spread, for vegetable production, means for polishing in metal industry, for insulation in civil engineering, in cosmetics industry, production of animal feed, and so on.