Thermal Degradation Behavior, Thermal Stability, and Kinetic Analysis of Solid Wastes for Their Valorization

The management of municipal solid wastes is one of the major problems for many years. As a result, it has a fatal contribution to the circumstances of hazardous effects such as a critical role in the pollution of major water bodies, fire hazards, and health issues, etc. This work deals with providing solutions to such kinds of problems. This study will assist in analyzing the pyrolysis and heat recovery potential of solid wastes. And can explore the effective utilization of municipal solid wastes. Thermal analysis techniques such as proximate analysis, calorific value analysis, thermogravimetric analysis, and differential thermogravimetry are adopted to analyze waste materials by using sophisticated instruments. Dynamic TGA experiments were performed under heating rates of 5, 10, and, 20 °C/min from room temperature to 900 °C. And N2 was supplied at a rate of 100 mL/min. The kinetic analysis was performed using isoconversional models such as Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), Starink (STK), and Tang (TM), respectively. The reaction mechanisms predicted for active pyrolysis stages of devolatilization using model prediction method of Criado’s master plots. The devolatilization stage of LDPE, HDPE, and Polystyrene shows Avrami–Erofeev (A2), Ginstling Brounchestein (D4), and 2–D Diffusion (D2) models respectively. The findings of this study will help to select the most appropriate samples for higher oil yield through pyrolysis. And to design, modify, and optimize the pyrolysis reactor.