Focusing on the reuse of the energy and aiming at the thermal and kinetic characterization of sewage sludge and its mixture, with pruning residues (50 mass%), the thermogravimetry was used. The kinetic study was elaborated from the local isoconversional integral method in heating rates 10.0, 20.0 and 30.0°C min-1 at a temperature ranging from 219 to 386°C at nitrogen atmosphere, in a flow of 100 mL min-1. The average activation energy of sewage sludge sample revealed the value of 219 kJ mol-1 and that of the mixture 161 kJ mol-1 , supporting the incorporation of pruning residues in the sewage sludge. During the degradation process, a remarkable increase in activation energy was noticed that ranged from 20 to 70% conversion in the sewage sludge sample, and regarding the mixture, an almost linear behavior was observed during the decomposition reaction. There was no evidence of kinetic compensation effect in the performed studies. The evaluation of the thermal characteristics, as well as the kinetic study of the degradation of sewage sludge and its mixture with pruning residues, can lead to important insights and contribute to a better use of energy regarding the environmental issues.

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Samples of pruning sawdust (PS) and water treatment plant (WTP) sludge residue were collected and mixed in proportions of 10 to 80% of WTP sludge in PS, submitted to torrefaction at 260°C, and the resulting biochar samples were submitted to TG/DTG analysis to assess their decomposition, thermal stability, and immediate analysis. Also, the nitrogen adsorption-desorption isotherm, mercury-injection capillary pressure (MICP), ultimate analysis, SEM, EDS, and FTIR were employed. The biochars of blend with 20% of sludge (BB20) and PS without sludge (BBM) were the ones that presented the best stability test in an aqueous medium. The biochar BB20 presented thermal stability (190°C), moisture (5.7%), volatiles (48.6%), fixed carbon (35.9%), ash (9.8%), BET surface area (0:7942 m 2 g À1 ), mean pore diameter (389:13Å), adsorption-desorption isotherm characteristic of the mesoporous material, highest MICP total pore volume, porosity (76.7%), total pore area (62:859 m 2 g À1 ), mean pore diameter (0:1322 l m) , the predominance of macropores. The biochar BBM showed BET surface area (1:3366 m 2 g À1 ), mean pore diameter (169:97Å), adsorption-desorption isotherm characteristic of mesoporous material, better second one MICP total pore volume, porosity (64.4%), total pore area (76:520 m 2 g), mean pore diameter (0:0786 lm) also, macroporosity. According to the results presented, the biochar BB20 itself to several uses as substitution of anthracite coal in water and filtration systems plant for the wastewater treatment due to macroporosity and as a viable solution to the reuse of these two residues.