Caracterização do lodo da indústria de papelão

Abstract

The paper industry has been maintained for decades as one of the world leaders in biomass consumption and water consumption, millions of tons of sludge from effluent treatment plants are generated annually, requiring the correct destination. The characterization of biomass and energy technologies such as pyrolysis help to allocate this residue properly, generating by-products such as coal, liquid and non-condensable gases, useful in other production chains. In this study, immediate physicochemical characterization of sludge (moisture, volatile material content, ash content and fixed carbon) was performed. Significant differences between ABNT and ASMT standards were verified by anova variance analysis; pyrolysis yield was quantified at temperatures of 400°C, 500°C, 600°C, 700°C and 800°C. The sludge presented ash content of 39.57±1.08, volatile content of 51.54±0.99, fixed carbon of 8.89% by astm regulations. Ash, volatile and fixed carbon contents by ABNT standards were 43.04±4.94, 55.07±1.42and 1.89%, respectively. Variance analyses showed that there is no 5 significant difference for ash content procedures, and there are significant differences between the processes of obtaining volatile contents. ASTM standards showed lower standard deviation in the assays. Pyrolysis yielded yields for temperatures of 400°C, 500°C, 600°C, 700°C and 800°C, respectively, 78.12%, 72.12%, 70.06%, 68.76% and 66.73% for the coal fraction, 8.17%, 19.19%, 17.32%, 18.76% and 14.61% for the net fraction and 13.71%, 8.69%, 12.62%, 12.49% and 18.66% for the gas fraction. Pyrolysis with low heating rate had a yield of 77.33% and 73.75% for coal, 10.00% and 5.73% for liquid, 12.66% and 20.52% for gases, respectively at temperatures of 400° C and 500°C.