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Open research questions in Recycling and Waste Management Techniques

103 gap statements mined from Recycling and Waste Management Techniques papers in our 4.5M-paper local library, which holds 1,626 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • 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

  • 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 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.

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

  • 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

  • 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.

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

  • 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

  • Because direct material-specific evidence remains limited, the resulting recommendations, including MES, LIMS, and blockchain, should generally be treated as directions requiring further validation.

    A Technology Selection Support Model in Industry 4.0 for Quality Assurance and Traceability in the Production of Waste-Derived Functional Materials · 2026 · DOI

  • Policies that increase recycling alone are insufficient; effective strategies must also target loss pathways and inefficiencies to improve long-term sustainability of REE recovery from e-waste.

    A nonlinear discrete-time compartmental model for rare earth e-waste recycling · 2026 · DOI

  • Mechanical grinding processes block the efficient differentiation of conductive and insulating materials; chemical processes engender the formation of solid and liquid effluents having an adverse environmental effect; and thermal processes are limited by the production of noxious gases and by their high-energy demand, thus limiting scale-up.

    Gabion with Photovoltaic Module Ballast: Ground Structure Constructed from the Reuse of the Aluminum Frame · 2025 · DOI

  • As a new and important carbon source, microplastic-derived DOM (MP-DOM) directly or indirectly affects the morphology and fate of Fh, but limited knowledge exists about the combined effect of MP-DOM and anions on Fh transformation.

    Molecular Insights into the Synergistic Inhibition of Microplastics-Derived Dissolved Organic Matter and Anions on the Transformation of Ferrihydrite · 2025 · DOI

  • Future research should focus on developing sustainable materials, advancing waste treatment technologies, and integrating smart systems with AI and IoT.

    A literature review on waste management treatment and control techniques · 2025 · DOI

  • The impact of contamination on PET mechanical recycling is not well understood. The need for guidelines for decision-making in PET mechanical recycling.

    State-of-the-art of industrial PET mechanical recycling: technologies, impact of contamination and guidelines for decision-making · 2024 · DOI

  • The paper highlights the need for further advancements in the plastic and composite packaging waste sector. The paper notes that the establishment of ambitious political targets is challenging to attain.

    The Factors Influencing the Recycling of Plastic and Composite Packaging Waste · 2024 · DOI

  • The biodegradation of e-waste plastics is a complex process that requires effective microbial strains. The study faces challenges in analyzing the biodegradation process using FTIR, TG-DTG-DTA, and SEM techniques. The paper highlights the need for effective biodegradation methods that can mitigate the negative impacts of e-waste on the environment.

    Comparative e-waste plastics biodegradation efficacy of monoculture Pseudomonas aeruginosa strain PE10 and bacterial consortium under in situ condition · 2024 · 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

  • 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

  • By addressing a gap in the literature that rarely integrates these constructs, the research contributes to a broader understanding of sustainable IT behavior in the Brazilian context.

    Socio-Environmental and financial drivers of sustainable IT and E-waste management · 2025 · DOI

Most-cited papers in Recycling and Waste Management Techniques

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Open questions raised by papers listed on this page include: (1) 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); (2) The paper identifies the lack of awareness to consumer regarding the proper way of disposal of e-waste as a research gap (“Evaluating the Electronic Waste Management System by Using Technique for Order…”, 2026); (3) The lack of standardized recycling protocols across the EU exacerbates the problem (“Photovoltaic Panel Recycling: A Crucial Component for Achieving EU Sustainable…”, 2026); (4) The lack of a coordinated national strategy to manage electronic and emerging waste streams in the United States (“E-Waste and Emerging Waste Streams (E-Cigarettes, Gas Cylinders): A Systematic…”, 2026); (5) The study suggests that future research should focus on developing more advanced recovery technologies (“INDIAS ELECTRONICS SECTOR: GROWTH TRENDS, E-WASTE PROJECTIONS, AND FUTURE…”, 2026). 103 gap statements have been mined from Recycling and Waste Management Techniques papers in our 4.5M-paper local library, which holds 1,626 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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