Kinetic and Thermodynamic Analyses of Sugar Cane Bagasse and Sewage Sludge Co-pyrolysis Process

This study investigates the co-pyrolysis of sugar cane bagasse (B), sewage sludge (5), and their blends of different proportions (100% B, 70% B/30% S, 50% B/50% S, 30% B/70% S, and 100% S) through thermogravimetric analysis differential thermal analysis at 20 C/min. The purpose of this study to assess the synergistic effect of the addition of sugar cane bagasse into sewage sludge and investigate the co-pyrolysis process kinetics and thermodynamics by employing five major reaction mechanisms with 17 models using the Coats and Redfern method. The kinetic result indicates a synergistic effect of bagasse and sewage sludge. The active co-pyrolysis zone was divided into two reaction zones: zone I (200-400 C) and zone II (400-600 C). In both zones, 100% bagasse has the highest E-a (F1-F3, 20.77-106.54 kJ/mol; D1-D4, 1.59-89.27 kJ/mol; N1-N4, 2.33-43.69 kJ/mol; and P0.5-Pi, 2.15-39.88 kJ/mol) and A (F1-F3, 2.22 X 10(+2)-6.4 X 10(+1)0 min(-1); D1-D4, 3.20 X 10(+2)-3.72 X 10(+2) min(-1); N1-N4, 2.33 X 10(+2)-3.20 X 10(+2)min(-1); and P0.5-Pi, 2.33 X 10(+2)-3.20 X 10(+2) min(-1)) compared to 100% sewage sludge Ea (F1-F3, 6.20-51.06 kJ/mol; D1-D4, 1.85-68.01 kJ/mol; N1-N4, 2.07-32.06 kJ/mol; and P0.5 Pi, 0.91-29.25 kJ/mol) and A (F1-F3, 2.66 X 10(+2)-4.0 X 10(+2) min(-1); D I-D4, 2.66 X 10(+2)-4.32 X 10(+2) min-'; N1-N4, 2.06 X 10(+2)-2.66 X 10(+2) min(-1); and P0.5-Pi, 2.06 X 10(+2)-2.66 X 10(+2) min') for all reaction mechanisms. Among blends in zones I and II, 70% B/30% S showed the highest Ea (F1-F3, 17.15-82.77 kJ/mol; D1-D4, 4.34-89.15 kJ/mol; N1-N4, 1.83-42.44 kJ/mol; and P0.5-Pi, 2.27-39.82 kJ/mol) and A (F1-F3, 2.24 X 10(+2)-3.40 X 10(+2) D1-D4, 4.76 X 10(+2)-12 X 10' min(-1); N1-N4, 2.32 X 10(+2)-2.43 X 10(+2) min(-1); and P0.5-Pi, 2.32 X 10(+2)-2.34 X 10(+2) min(-1)) compared to all other blends for all reaction mechanisms.