Characterization of branch waste of several tropical fruit tree species as considerations for bioenergy resources

The aims of this research were to analyse the bio-energy properties of tree branches and determine the appropriate conversion process for the fuel source use of each species. Bio-energy properties, such as proximate analysis, calorific value, firewood value index, and hydrolysis rate of wood, and chemical component content were evaluated for branches of 11 fruit tree species (Cacao, Durian, Java plum, Rose apple, Guava, White leadtree, Mango, Gnetum, Jackfruit, Rambutan, Strawberry tree) planted in Indonesia. Among all 11 species, Rambutan, Mango, and Java plum were the best 3 species for firewood feedstock, with the score 176.6, 169.2, and 163.8 respectively. While Mango, White leadtree, and Jackfruit were the best three species for liquid bio-fuel feedstock, with the score 91.1, 86.6, and 78.0 respectively. The branches of Durian and Gnetum can be used for purposes other than bio-energy due to their low score in both two groups. © 2020 IOP Publishing Ltd.