WASTE VALORIZATION THROUGH CHEMICAL PROCESSES: A GLOBAL REVIEW

Abstract

Waste valorization through chemical processes has emerged as a critical strategy for addressing the dual challenges of environmental sustainability and resource scarcity. This review provides a global perspective on the current advancements, trends, and challenges associated with transforming various types of waste—industrial, agricultural, municipal, and electronic—into valuable products such as fuels, chemicals, and materials. Key chemical processes including pyrolysis, gasification, hydrothermal liquefaction, catalytic upgrading, and biochemical–chemical hybrid approaches are analyzed in terms of efficiency, scalability, and environmental impact. Special attention is given to regional variations in adoption, policy frameworks, and technology transfer mechanisms that shape waste valorization efforts across developed and developing nations. The study highlights that while chemical valorization technologies present promising pathways for achieving circular economy goals, significant barriers such as high energy input, catalyst deactivation, process integration challenges, and economic feasibility still hinder large-scale deployment. Future opportunities lie in the integration of green chemistry principles, renewable energy-driven processes, and advanced catalysts to enhance conversion efficiencies. The global review concludes that successful waste valorization through chemical processes requires coordinated efforts across research, industry, and policy to drive innovation, reduce environmental burdens, and create sustainable value chains.