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Open research questions in Recycling and Waste Management Techniques

50 unresolved questions extracted from the limitations and future-work sections of 463 Recycling and Waste Management Techniques papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • High energy consumption and low energy efficiency of conventional gasification processes. Limited scalability of plasma gasification processes. Need for effective catalysts to optimize gasification performance.

    Reduction of energy consumption and enhancement of hydrogen yield from E-waste via plasma gasification process with waste heat recovery system · 2026 · DOI

  • The study does not investigate the scalability of the plasma gasification process. The study does not explore the economic feasibility of the process. The study is limited to a specific type of e-waste.

    Reduction of energy consumption and enhancement of hydrogen yield from E-waste via plasma gasification process with waste heat recovery system · 2026 · DOI

  • The complex composition of PV panels complicates the recycling process. Traditional recycling methods often result in the loss of valuable materials and are not always economically viable. The lack of standardized recycling protocols across the EU exacerbates the problem.

    Photovoltaic Panel Recycling: A Crucial Component for Achieving EU Sustainable Development Strategies · 2026 · DOI

  • The study identifies a gap in the use of organic waste as a base material for bio-batteries. The study addresses the need for sustainable and eco-friendly energy sources.

    Development of Bio-battery from Pineapple Peel Waste (Ananas Comosus L. Merr) Using Table Salt (NaCl) as Ion Source and Tapioca Starch as Matrix · 2026 · DOI

  • While the IC wastewater-derived catalyst achieves 99% metal recovery and nearly quantitative PET conversion, long-term catalyst stability, reusability cycles, and performance degradation over repeated use cycles are not discussed.

    Integrating integrated circuit wastewater into the metal catalyst supply chain · 2026 · DOI

  • Traditional e-waste management systems often depend on manual sorting or hardware-based solutions, which are costly, time-consuming, and expose workers to hazardous materials. The lack of effective monitoring and inefficient recycling practices contribute to the environmental concerns of e-waste.

    E-Waste Tracking and Responsible Disposal Management System · 2026 · DOI

  • There is a lack of empirical evidence explaining the adoption of e-waste reverse vending machines. The study aims to address this gap by examining the determinants of e-waste RVM adoption intention among Generation Z university students in Malaysia.

    Empowering Sustainable E-Waste Recycling through Reverse Vending Machine Adoption among Generation Z in Malaysia · 2026 · DOI

  • Technical challenges, including the need for robustness to field reality and low compute demands. Behavioral challenges, including the need for user engagement and participation. Environmental challenges, including the need for reduced plastic waste and increased recycling rates.

    A Scoping Review of Smart Recycling Technologies: AI, IoT, and Incentive-Based PET Bottle Vending Systems · 2026 · DOI

  • Future work should report end-to-end system designs and evaluate technical accuracy alongside behavioral uptake, operational reliability, and impact metrics. Future work should test a structured TPB-based research framework, modelling recognition speed, payout reliability, and system transparency as exogenous technical performance variables.

    A Scoping Review of Smart Recycling Technologies: AI, IoT, and Incentive-Based PET Bottle Vending Systems · 2026 · DOI

  • The rapid adoption of EV in developing countries across the Asia-Pacific region presents a critical window of opportunity to establish a robust circular economy for managing EoL batteries. This transition is essential to simultaneously mitigate environmental harm and unlocking new economic value. The current situation, characterized by high projected waste volumes in countries like India and Brazil and alongside minimal formal recycling infrastructure, necessitates an urgent and focused shift away from the linear “take-make-dispose” model. This paper argues that advancing a CE in these contexts requires a strategic two-pronged approach, one is harnessing private sector initiatives, and another is significantly educating and empowering SMEs. The proposed operational roadmap links EPR mandates for large manufacturers with vocational certification programs for SMEs. This interlinked approach aims to transform battery waste into a resource by providing a testable pathway for local governments to formalize the informal sector. Suich formalization is critical for securing material supply chains and creating decentralized “green” jobs in the battery repair and recycling industry. Under this framework, the private sector, particularly large manufacturers and importers, must be mandated through EPR policies to lead investment in advanced, safe recycling technologies and establish efficient national take-back systems. To be effective, these systems must be culturally and logistically adapted to emerging markets, potentially integrating existing informal collection networks. Concurrently, empowering SMEs is essential, as these actors are vital for localized repair, refurbishing, and second-life battery applications. This requires dedicated financial support such as low-interest loans and grants, coupled with targeted technical training on safe handling, advanced recovery techniques, and circular business models. Together, mandatory recycling targets, PPPs for infrastructure, and comprehensive stakeholder education form a cohesive roadmap for transitioning the EV battery value chain into a sustainable, closed-loop system. Looking ahead, future perspective demands continuous innovation and proactive policy alignment to keep pace with rapid technological change in battery chemistry and design. The next decade will see a substantial increase in both the volume and diversity of EoL batteries, emphasizing the need for flexible, multi-chemistry recycling processes. Research and development investment should focus on direct recycling technologies, which are more energy-efficient and yield purer materials, thereby increasing the economic competitiveness of recycled content. The future policies must also address the full integration of digital technologies, including blockchain and Artificial Intelligence (AI), to ensure transparent, safe, and traceable management of batteries throughout their entire lifespan, from manufacturing to eventual material recovery. Furthermore, circular economy education initiatives must evolve into institutionalized vocational and professional certifications to guarantee a continuously skilled workforce capable of scaling up repurposing and recycling operations safely. Ultimately, the success of these strategies will be measured not just by the volume of batteries recycled, but by the extent to which they promote a truly inclusive circular economy. Such a system must formalize informal workers, create green jobs, and secure critical material supply chains to ensure the region’s long-term environmental and economic resilience.

    Advancing Circular Economy for Managing Electric Vehicles Battery Waste in Developing Countries by Harnessing Private Sector Initiatives and SMEs Education · 2026 · DOI

  • The application of EPR in India is accompanied by regulatory and logistical issues. There is a need for sustainable waste management solutions.

    Extended Producer Responsibility in Mitigating E-waste: A Study of Mobile Phone Users in India · 2026 · DOI

  • Future studies will focus on evaluating the practical outcomes of E-waste disposal for Cluster 1, assessing the impact of educational programs on the aware- ness and behaviour of members of Cluster 2, and examining the accessibility and usability of information provided to the members of Cluster 3.

    Extended Producer Responsibility in Mitigating E-waste: A Study of Mobile Phone Users in India · 2026 · DOI

  • The paper identifies the lack of awareness to consumer regarding the proper way of disposal of e-waste as a research gap. The paper identifies the unavailability of collection units for e-waste as a research gap.

    Evaluating the Electronic Waste Management System by Using Technique for Order Performance by Similarity to Ideal Solution · 2026 · DOI

  • The inability of heavy metals to degrade biologically and their bioaccumulation through food chain induce drastic hazards to the entire ecosystem. There is a need to explore effective methods for the removal of heavy metals from wastewater.

    Circular economy approach: repurposing modified lemon peel waste for cobalt(II) capture from simulated solutions · 2026 · DOI

  • Emerging directions encompass closed-loop recycling, machine-learning for material sorting, and Life-Cycle Assessment (LCA) comparisons. Research and development in advanced recycling technologies are needed.

    Photovoltaic Panel Recycling: A Crucial Component for Achieving EU Sustainable Development Strategies · 2026 · DOI

  • The literature highlights that e-commerce ecosystems go beyond their traditional role as distribution channels, becoming complex platforms that can support the transition to sustainability and the circular economy, but there is a need to analyse the influence of SMEs involved in e-commerce ecosystems on the recycling of WEEE and on the circular use of materials. There is a gap in understanding the relationship between SME involvement in e-commerce ecosystems and the performance of the circular economy in the EU.

    The Influence of SMEs Involved in E-Commerce on Waste Recycling and Circular Use of Materials in The European Union · 2026 · DOI

  • Incomplete life-cycle boundaries in life cycle assessment studies. Inadequate exposure quantification for occupational hazards. Limited statistical power in pilot-scale interventions.

    E-Waste and Emerging Waste Streams (E-Cigarettes, Gas Cylinders): A Systematic Review of Global Management Strategies and Implications for U.S. Stewardship Programs · 2026 · DOI

  • The lack of a coordinated national strategy to manage electronic and emerging waste streams in the United States. The need for effective management of emerging waste streams such as e-cigarettes and gas cylinders.

    E-Waste and Emerging Waste Streams (E-Cigarettes, Gas Cylinders): A Systematic Review of Global Management Strategies and Implications for U.S. Stewardship Programs · 2026 · DOI

  • The development of more efficient and environmentally sound recycling technologies. The improvement of existing delamination methods. The exploration of new recycling methods, such as bioleaching and supercritical carbon dioxide foaming methods.

    Progress in Recycling and Processing of End-of-Life Crystalline Silicon Photovoltaic Modules · 2026 · DOI

  • The existing recycling methods have failed to meet industry expectations. There is a need for more efficient and environmentally sound recycling technologies. The development of recycling technologies that can recover the maximum percentage of components and materials is crucial.

    Progress in Recycling and Processing of End-of-Life Crystalline Silicon Photovoltaic Modules · 2026 · DOI

  • The long-term durability performance of concrete incorporating recycled plastics remains an area requiring extensive further investigation. The hot and arid climate presents significant challenges for concrete curing, which directly affects its strength and long-term durability.

    Plastic waste recycling in arid regions: technology selection and sustainability trade-offs in Qatar · 2026 · DOI

  • The lack of a comprehensive framework for plastic waste recycling in arid regions. The need for further research on the long-term durability performance of concrete incorporating recycled plastics.

    Plastic waste recycling in arid regions: technology selection and sustainability trade-offs in Qatar · 2026 · DOI

  • The study suggests that future research should focus on developing more advanced recovery technologies. The study emphasizes the importance of developing formal recycling infrastructure and circular business models.

    INDIAS ELECTRONICS SECTOR: GROWTH TRENDS, E-WASTE PROJECTIONS, AND FUTURE OUTLOOK · 2026 · DOI

  • The study identifies a gap in the understanding of the growth trajectory of India's electronics sector and its implications for e-waste generation. The study highlights the need for a comprehensive analysis of the sector's growth and e-waste generation.

    INDIAS ELECTRONICS SECTOR: GROWTH TRENDS, E-WASTE PROJECTIONS, AND FUTURE OUTLOOK · 2026 · DOI

  • The role of chemicals embedded in products has received limited systematic attention. There is a need to examine the mechanisms through which chemicals hinder recycling.

    Chemical Risks as Barriers to Recycling: Mechanisms and Policy Implications for a Safe Circular Economy · 2026 · DOI

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50 open questions have been extracted from the limitations and future-work passages of 463 Recycling and Waste Management Techniques papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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