Análise econômica da produção de misturas asfálticas com cinza de termelétrica, biochar e bio-óleo

Abstract

The conditions of the highways in Amazonas are worrying, considering that it is the only state in Brazil where there are no roads classified as excellent or good. In this context, research aimed at replacing the materials conventionally used in hot asphalt mixtures with others of good technique, lower cost and environmental impact are pertinent. It is noteworthy that in thermoelectric plants, ashes (light and heavy) are generated that are harmful to the environment and health. In addition, due to the Industrial District, the city of Manaus is a major producer of industrial waste, notably Printed Circuit Boards (PCI), which can undergo pyrolysis and transform into biochar and bio-oil. In this work, an economic analysis of the production of hot machined asphalt mixtures was carried out, with the participation of thermoelectric ash, bio-oil or biochar. In this analysis, the cost of producing traditional asphalt concrete was compared with that containing alternative materials. Also, the implementation of the pyrolysis plant was considered in three scenarios with which the Net Present Value (NPV), Internal Rate of Return (IRR) and Simple Capital Recovery Period (Payback) were calculated. The greatest savings occur when there is a partial replacement (10%) of the traditional CAP by bio-oil. It is noteworthy that the first scenario presented the lowest investment risks with an IRR of 143% and Payback of the order of 182 days, with the second scenario having the highest profitability of around R$ 24,6 million. It is concluded that the use of thermoelectric ash, bio-oil and biochar in asphalt mixtures is economically viable.