Avaliação da produção, comercialização e uso de serradura na cidade de Maputo

Abstract

A part of the volume of wood waste produced by the wood industry in the city of Maputo is in the form of sawdust. However, information on the quantities of sawdust produced in sawmills and carpentry, as well as the use for which it is intended, is deficient. The present work intends to evaluate the production and commercialization of sawdust in sawmills and carpentry in the city of Maputo, as well as its uses, with a view to defining strategies for the best use of this residue from the wood industry. To determine the amount of sawdust produced in the sawmills, a visual Fox Pro software was created, which allowed determining the percentage of sawdust produced per log processed, and the sawdust volume per sawmill, based on mathematical formulas and general sawdust procedures in the city ​​of Maputo. On the other hand, semi-structured interviews were used to qualify the sawdust sold and identify its uses. The results of the work show that, in Maputo city's sawmills, at least 6227,484m3 of sawdust is produced annually, which comes mainly from the transformation of Afzelia quanzwsis and pterocarpus angolensisi logs in the main saw and in the alignment. thin and thick. Fine sawdust is used for fuel and as a substrate, and coarse sawdust is used in aviaries for heating chicks. The fine sawdust used for fuel is more consumed. The results also indicate that populations living close to sawmills and carpentry shops buy at a low price compared to other woody fuels, it is estimated that at least 810 families can potentially benefit from it as fuel. Based on the results obtained, the study recommends evaluating the feasibility of developing standardized stoves for the use of sawdust or its transformation into briquettes, for better use, which will certainly contribute to reducing the pressure on other woody fuels.