Closing the Loop in Electronics: A Review on Sustainable Utilization of E-Waste

Abstract

Even as global efforts to manage the growing volumes of solid and hazardous waste In an environmentally sound manner, the world is now facing an even more complex challenge, the rapid growth of electronic waste(e-waste). The global e-waste market is projected to reach USD 65.9 billion by 2025, reflecting its increasing environmental and economic significance. E-waste accumulates as a byproduct of technology-driven lifestyles, including households, educational institutions, workplaces, and IT sectors. E-waste poses serious threats to the environment as well as to health conditions due to the toxic elements like heavy metals and flame retardants that can pollute the ecosystem. At the same time, e-waste represents a valuable resource due to the presence of precious and rare-earth metals. However, existing research has largely focused on environmental hazards and management challenges, with comparatively limited emphasis on sustainable and low-cost utilization strategies. This review aims to critically examine current e-waste recycling and utilization technologies, with a focus on identifying practical and sustainable approaches for resource recovery. The study is based on a structured literature survey primarily conducted using the Scopus database, where relevant studies were systematically screened and categorized into key thematic areas, including environmental impacts, material composition, recovery techniques, and emerging utilization strategies. This review summarizes current e-waste recycling and use technologies by combining environmental risk assessment with resource recovery potential. It looks at the chemical makeup of e-waste and its health impacts while examining physical and chemical recovery methods in terms of scalability and practical use. It focuses on challenges in developing countries, such as poor infrastructure and the environmental risks tied to unregulated e-waste imports. To tackle these issues, this study suggests a low-cost and practical method for extracting carbon materials from waste batteries to create conductive inks for sensor applications. This proposed approach represents a novel contribution by demonstrating the potential of converting e-waste into functional materials, supporting circular economy principles, and enabling localized, sustainable resource utilization in resource-limited settings.