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 (S), 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 analysisdifferential 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, 20.77-106.54kJ/mol; D1-D4, 1.59-89.27kJ/mol; N1-N4, 2.33-43.69kJ/mol; and P0.5-Pi, 2.15-39.88kJ/mol) and A (F1-F3, 2.22 × 10 +2 -6.4 × 10 +10 min -1 ; D1-D4, 3.20 × 10 +2 -3.72 × 10 +2 min -1 ; N1-N4, 2.33 × 10 +2 -3.20 × 10 +2 min -1 ; and P0.5-Pi, 2.33 × 10 +2 -3.20 × 10 +2 min -1 ) compared to 100% sewage sludge E a (F1-F3, 6.20-51.06kJ/mol; D1-D4, 1.85-68.01kJ/mol; N1-N4, 2.07-32.06kJ/mol; and P0.5-Pi, 0.91-29.25 kJ/mol) and A (F1-F3, 2.66 × 10 +2 -4.0 × 10 +2 min -1 ; D1-D4, 2.66 × 10 +2 -4.32 × 10 +2 min -1 ; N1-N4, 2.06 × 10 +2 -2.66 × 10 +2 min -1 ; and P0.5-Pi, 2.06 × 10 +2 -2.66 × 10 +2 min -1 ) for all reaction mechanisms.Among blends in zones I and II, 70% B/30% S showed the highest E a (F1-F3, 17.15-82.77kJ/mol; D1-D4, 4.34-89.15kJ/mol; N1-N4, 1.83-42.44kJ/mol; and P0.5-Pi, 2.27-39.82kJ/mol) and A (F1-F3, 2.24 × 10 +2 -3.40 × 10 +2 min -1 ; D1-D4, 4.76 × 10 +2 -12 × 10 +5 min -1 ; N1-N4, 2.32 × 10 +2 -2.43 × 10 +2 min -1 ; and P0.5-Pi, 2.32 × 10 +2 -2.34 × 10 +2 min -1 ) compared to all other blends for all reaction mechanisms.