Lignocellulosic biomass is a vital resource for providing clean future energy with a sustainable environment. Besides lignocellulosic\nresidues, nonlignocellulosic residues such as sewage sludge from industrial and municipal wastes are gained much\nattention due to its large quantities and ability to produce cheap and clean energy to potentially replace fossil fuels. These cheap\nand abundantly resources can reduce global warming owing to their less polluting nature. The low-quality biomass and high ash\ncontent of sewage sludge-based thermal conversion processes face several disadvantages towards its commercialization. Therefore,\nit is necessary to utilize these residues in combination with coal for improvement in energy conversion processes. As per author\ninformation, no concrete study is available to discuss the synergy and decomposition mechanism of residues blending. The\nobjective of this study is to present the state-of-the-art review based on the thermal coconversion of biomass/sewage sludge, coal/\nbiomass, and coal/sewage sludge blends through thermogravimetric analysis (TGA) to explore the synergistic effects of the\ncomposition, thermal conversion, and blending for bioenergy production. This paper will also contribute to detailing the\noperating conditions (heating rate, temperature, and residence time) of copyrolysis and cocombustion processes, properties, and\nchemical composition that may affect these processes and will provide a basis to improve the yield of biofuels from biomass/\nsewage sludge, coal/sewage sludge, and coal/biomass blends in thermal coconversion through thermogravimetric technique.\nFurthermore, the influencing factors and the possible decomposition mechanism are elaborated and discussed in detail. This study\nwill provide recent development and future prospects for cothermal conversion of biomass, sewage, coal, and their blends.
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