Determinação do poder calorífico do lodo de esgoto doméstico e industrial a partir da análise imediata

Abstract

Some wastes have interesting properties for the energy production if operated properly, it making a sustainable alternative in view of wide industrial development and environmental degradation. The objective of this study was to analyze the energy potential of sludge car washing, sewage sludge and sludge from paper recycling industry. For that, it was determined the moisture content, the volatile matter, ash content, fixed carbon and through a mathematical correlation the biomass heating analyzed. The moisture contents found for the sludge washing vehicles, sewage sludge and sludge from paper recycling industry were 35.49%, 86.70% and 65.90%, respectively. On a dry basis, the sludge of the washing vehicles showed 7.22% of volatile material, 92.70% ash and 0.08% fixed carbon. The sludge from the car washing indicated 62.11% volatile material, 28.76% ash and 9.13% fixed carbon. The sludge from paper recycling industry pointed 56.68% volatile material, 34.27% ash and 9.05% fixed carbon. The sludge from car washing had the lowest heating value 0.43 MJ.kg-1, being disqualified for power generation, while the sewage sludge and the paper industry presented, 12.69 MJ.kg-1 e 11.77 MJ.kg-1 , respectively, showing favorable properties for the combustion process to be studied in more depth.