Beneficiamento físico-químico do resíduo sólido dregs da indústria de celulose e papel para emprego em misturas asfálticas

Abstract

The pulp and paper industry has great relevance in the global economy, being one of the top waste generating industry. As a large part of this waste is still disposed of in industrial landfills, studies that enable its recycling are increasingly necessary, promoting the mitigation of negative environmental impacts allied to the reduction of the consumption of non-renewable natural resources. The general objective of this research was to evaluate the effect of the treatment of dregs (waste generated in Kraft process) to enable its use as a filler in bituminous mixtures. For this, is was proposed washing and filtration of the waste, promoting the reduction of the content of soluble salts, responsible for the increase in the consumption of petroleum asphalt cement (PAC) and reduction of the mechanical resistance of bituminous mixtures. To verify the efficiency of the treatment, the physical, chemical and mineralogical characterization of the waste was carried out before and after the treatment, as well as the physical and mechanical characterization of the asphalt mixtures produced with and without the incorporation of the waste. There was a reduction in pH values and mainly in electrical conductivity over the 3 washes applied, being the EC reduced by 98% when compared to the untreated waste. In the Marshall test, the mixes containing dregs in their composition met all normative limits, and the mixture containing 4% of dregs showed lower fluence than the reference mix. The treatment of this material can enable its use in more sustainable pavements, paying attention to the specifications established by current standards.