Is it advantageous to reuse fruit waste biomass from processing of grapevine (Vitis vinifera L.) for briquette production?
2017
Brunerova, A., Czech Univ. of Life Sciences, Prague (Czech Republic) | Brozek, M., Czech Univ. of Life Sciences, Prague (Czech Republic)
Wine making industry represents a significant part of the agriculture sector; a growing area, where grapevine (Vitis vinifera L.) Was cultivated, was equal to 7,534 mil. ha in 2015 and produced 275.7 mil. hl of wine worldwide (50 % in European regions). Such a large industry produces a great amount of waste materials. During grapevine technological processing (wine production) waste biomass is produced in the form of vine-shoots, pruning, stems, seeds or fruit pressings and is commonly used as fertilizer, plowed into soil or burnt. Therefore, the present research deals with the suitability of grapevine residues (fruit biomass) reusing for briquette production purposes. The investigated material consists of the following parts: skins, pulps, seeds and stems, thus, occurred in heterogeneous mixture. The initial form of the material exhibited high moisture content, thus, had to be dried in a laboratory dryer and subsequently crushed and homogenized. The produced briquette samples were densified into cylindrical shape with diameter 50 mm with different length and weight. Determination of the briquette final quality was stated directly after briquette production. The chemical analysis was focused on the briquette moisture, ash content and calorific value while the mechanical analysis described the mechanical durability and volume density of the briquette samples. The result values of experimental testing proved great level of the moisture content (5.3 %), ash content (6.2 %); the gross calorific value was equal to 19.2 MJ kgE–1 which is a great result. However, the result values of the briquette mechanical quality indicators exhibited low level; the mechanical durability was equal to 28.3 ± 3.5 %, which is an unsatisfactory result. It can be concluded that the investigated material is advantageous for combustion purposes, but the performance of the biofuel was not suitable. This fact offers an opportunity to improve bad mechanical properties of briquettes by mixing with other feedstock with high lignin content (natural binder).
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