From Disposal to Resource: Technological Innovations for Closing the Loop on Solid Waste

Dear Colleagues,

Global urbanization and economic growth are driving solid waste generation to soar at an unprecedented rate, with annual global waste production projected to reach 3.4 billion tons by 2050. The current linear management model of “collection–transportation–disposal” not only consumes vast amounts of land resources but also leads to severe greenhouse gas emissions and environmental pollution. Consequently, establishing an efficient, circular waste management system has become an urgent global priority. The core challenge lies in whether technological innovation can transform waste from an “environmental burden” into an “urban mineral” while meeting growing treatment demands—all without exceeding the Earth's ecological boundaries.

Against this backdrop, the selection and application of cutting-edge technologies will play a decisive role. A series of disruptive technologies are emerging, ranging from AI-driven intelligent sorting robots and efficient bioconversion techniques, such as anaerobic digestion, to thermochemical processes that convert waste into high-value chemicals or fuels. However, the successful deployment and scaling of these technologies depend not only on their technical and economic viability but also critically on public awareness, acceptance, and behavioral cooperation. For instance, residents' precise sorting and disposal are prerequisites for intelligent recycling systems, while community acceptance of waste-to-energy facilities directly determines project siting and implementation.

We look forward to receiving your contributions.

Dr. Xingying Tang
Dr. Jianjun Cai
Guest Editors

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