Circular Economy最新文献

{"title":"Assessing solid waste management effectiveness using the “Zero-waste index” — Exploration and practice in Chongqing","authors":"Hongying Cai ,&nbsp;Zhenhan Duan ,&nbsp;Junqiang Lv ,&nbsp;Lianchuan Zhou ,&nbsp;Qiong Zhou ,&nbsp;Yusen Yan ,&nbsp;Juan Long ,&nbsp;Jianwei Du","doi":"10.1016/j.cec.2025.100167","DOIUrl":"10.1016/j.cec.2025.100167","url":null,"abstract":"<div><div>“Zero-waste City” (ZWC) is an innovative urban development model aimed at reducing solid waste generation, minimizing resource loss, and mitigating environmental impacts. In China, over 100 cities have implemented ZWC initiatives under the 14^th Five-Year Plan, focusing on source reduction and resource recovery across the industrial, agricultural, residential, and construction sectors. However, the absence of quantitative, integrated, and real-time assessment tools has hindered comprehensive evaluation of ZWC progress. To address this gap, this study proposes a “Zero-waste Index” (ZWI) system comprising 15 indicators across seven thematic categories designed to quantify solid waste management performance at the sub-municipal level. The ZWI was empirically applied to 41 districts and counties in Chongqing, a megacity characterized by extensive territorial scope, significant socioeconomic disparities, and uneven levels of administrative infrastructure. Results from two consecutive quarters in 2024 reveal a 12% increase in the citywide average ZWI scores, highlighting strong performance in agricultural and household waste utilization and in energy conservation efforts by public institutions, while also indicating persistent weaknesses in industrial waste management, construction waste compliance, and plastic pollution control, particularly in the Southeastern and Northeastern Areas of Chongqing. ZWI also functions as a governance tool, facilitating feedback-driven performance improvement across districts. Although challenges such as subjective weight allocation and data inconsistencies remain, the ZWI provides a replicable framework for real-time performance tracking and policy feedback, offering valuable insights for other cities seeking to advance “Zero-waste” strategies and improve solid waste management.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 4","pages":"Article 100167"},"PeriodicalIF":0.0,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145289621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient recycling of glass fibers from waste printed circuit boards using metal-organic framework composites for photocatalytic degradation","authors":"Shiwei Wang ,&nbsp;Sui Mao ,&nbsp;Chuanjin Guan ,&nbsp;Wenyi Yuan ,&nbsp;Mengjiao Wu","doi":"10.1016/j.cec.2025.100166","DOIUrl":"10.1016/j.cec.2025.100166","url":null,"abstract":"<div><div>In recent years, the disposal of waste printed circuit boards (WPCBs) has emerged as an increasingly serious issue, particularly concerning the non-metallic powder generated during metal recovery, which poses a significant challenge to the utilization of e-waste resources. Furthermore, numerous technical defects are associated with this process. A systematic method is presented for preparing glass fiber ball bundles (GfBs), which incorporate a variety of metal-organic frameworks (MOFs) to create GfB/MIL-125 (Ti), GfB/MIL-100 (Fe), GfB/Bi₂MoO₆, and GfB/Bi₂MoO₆/MIL-100 (Fe) process systems. This approach aims to increase the efficiency of recycling glass fibers from the non-metallic powders of WPCBs. This study aims to investigate the photocatalytic degradation performance of composite materials comprising glass fibers loaded with MOFs, specifically GfB/MIL-100(Fe), GfB/Bi₂MoO₆, and GfB/Bi₂MoO₆/MIL-100(Fe), on model wastewater containing the organic compound methylene blue (MB). These findings indicate that the composites exhibited high photocatalytic efficiency and good reusability. The synthesized MOF composites achieved photocatalytic degradation of 100 mL of a 50 mg/L MB solution, reaching up to 96% degradation in 3 h, with a residual removal rate of 85% after 5 cycles. This study provides novel insights into the recycling of non-metallic materials from waste circuit boards and the development of environmentally friendly photocatalysts.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 4","pages":"Article 100166"},"PeriodicalIF":0.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145289620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Biotechnological approaches: Degradation and valorization of waste plastic to promote the circular economy” [Circular Economy 3(1) (2024) 100077]","authors":"Sridevi Veluru ,&nbsp;Ramakrishna Seeram","doi":"10.1016/j.cec.2025.100159","DOIUrl":"10.1016/j.cec.2025.100159","url":null,"abstract":"","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100159"},"PeriodicalIF":0.0,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and characterization of brewers’ spent grain-based materials","authors":"Antonietta Baiano,&nbsp;Anna Fiore","doi":"10.1016/j.cec.2025.100158","DOIUrl":"10.1016/j.cec.2025.100158","url":null,"abstract":"<div><div>Brewers’ spent grain (BSG) is the main by-product of brewing processes. As a lignocellulosic material, BSG is suitable for producing disintegrable composite materials and packaging. Our research aimed to develop BSG-based formulations with and without corn starch that are suitable for producing objects through thermomoulding. The thermomoulding temperature was fixed at 200 °C, and the thermomoulding time ranged from 4 to 30 min. The effects of the thickness (2, 5 and 10 mm), addition of corn starch and BSG type (W (wet), U (dried and unground), P (dried, unground and hot-water treated before use) and M (dried and milled)) on the physical and mechanical properties, absorption capacity, disintegration degree and solubility of the tray materials were investigated. All formulations were characterized by high water absorption (&gt;71.73%), weight loss (46.73%–67.58%) and solubility (30.78%–44.68%). The density, breaking strength and resistance to penetration decreased as the thickness increased, whereas no differences in the flexural strength were detected. The addition of starch reduced both the density and water absorption percentage and increased the penetration strength. With respect to the BSG state, the use of W-BSG resulted in the highest resistance to flexion (0.11 N/mm²) and the lowest resistance to penetration (2.15 N/mm); the use of M-BSG resulted in the highest resistance to penetration (6.36 N/mm). Principal component analysis highlighted that most of the materials developed had physical and mechanical characteristics that made them different from each other and therefore suitable for different uses.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100158"},"PeriodicalIF":0.0,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144827028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From construction for construction: Additive manufacturing with gas-atomized recycled steel scrap","authors":"Jan-Simeon Ludger Bernsmann,&nbsp;Johannes Henrich Schleifenbaum","doi":"10.1016/j.cec.2025.100157","DOIUrl":"10.1016/j.cec.2025.100157","url":null,"abstract":"<div><div>Climate change and energy scarcity, as well as changing socio-demographic structures and new user needs, drive major changes in the design, construction, and operation of buildings towards sustainability. As the building sector accounts for 35% of global energy consumption and 38% of global CO₂ emissions, the energy-efficient and sustainable design and maintenance of buildings will be an effective lever for creating sustainable living conditions in the future. The use of recycled materials in construction can reduce CO₂ emissions and ensure a circu`lar economy. In this work, a proof of concept is presented for additive manufacturing by laser powder bed fusion (PBF-LB/M) of metal powder obtained by gas atomization of recycled steel from demolished buildings. From the atomization of approximately 50 kg of steel scrap, 27.8 kg of particles finer than 90 μm were obtained, whereas particles ranging between 90 μm and 315 μm accounted for 14.1 kg. The samples made from the recycled powder had a relative density of 99.9%, no porosity and excellent mechanical properties. The average tensile strength of the produced material was 808 MPa, whereas the average yield strength was 716.4 MPa. These results demonstrate the feasibility and efficiency of using gas atomized recycled steel scrap for additive manufacturing, providing high-quality materials with excellent mechanical properties suitable for construction applications.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100157"},"PeriodicalIF":0.0,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating circularity in the construction and demolition sector through remote sensing: A case study of Bolzano/Bozen, Italy","authors":"Kseniia Shkirman ,&nbsp;Anna Stoppato ,&nbsp;Fabio Giussani ,&nbsp;Simon Pezzutto","doi":"10.1016/j.cec.2025.100156","DOIUrl":"10.1016/j.cec.2025.100156","url":null,"abstract":"<div><div>The built environment in urban areas contributes significantly to global waste generation through construction and demolition activities, highlighting the need for circular economy strategies to ensure sustainable development. Digital technologies offer fast and reliable methods to track material flows and improve resource efficiency. This study proposes a novel approach that integrates data from OpenStreetMap (OSM) and the Urban Atlas for land-use identification. The material stock (MS) is estimated via a geographic information system (GIS) to analyse the spatial characteristics of buildings, combined with material intensity (MI) data to assess the mass of materials within structures. Together with the quantification of material stock, hotspots of construction materials within the building stock are identified. When applied to the case study of Bolzano/Bozen, Italy, this approach estimated 130 tonnes per capita of accumulated building stock in the city and 40 tonnes per capita of material stock in infrastructure networks. This remote sensing methodology provides detailed insights into the quantity and distribution of materials in buildings and networks. The openness and availability of OSM data, as well as their independence from cadastral records, make this approach particularly advantageous for obtaining input data for the life cycle assessment (LCA) of buildings and the development of waste management strategies.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100156"},"PeriodicalIF":0.0,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights and practices for industrial solid waste management under “zero-waste city” construction in China","authors":"Qifei Huang,&nbsp;Tong Zhao,&nbsp;Mingsong Lin,&nbsp;Weishi Li,&nbsp;Qi Zhou,&nbsp;Chao Chen","doi":"10.1016/j.cec.2025.100155","DOIUrl":"10.1016/j.cec.2025.100155","url":null,"abstract":"<div><div>China's “zero-waste city” (ZWC) pilot program, initiated in 2018, has driven innovative practices in industrial solid waste (ISW) management across diverse urban contexts. This study categorizes cities into resource-output, manufacturing-oriented, and comprehensive types to propose tailored strategies that address unique industrial challenges while promoting sustainability. Resource-output cities prioritize ecological restoration through the transformation of abandoned mining sites, repurposing waste materials to restore degraded environments and support local economic development. Manufacturing-oriented cities focus on green industrial upgrades and circular economy models to enhance the comprehensive utilization of waste, reduce generation intensity, and foster market competitiveness for recycled products. Comprehensive cities, often large urban centers, have embraced digital technologies to optimize the precision management of ISW, thereby enhancing regulatory efficiency and resource utilization. These targeted approaches implemented thus far have let to measurable reductions in ISW generation, improved resource recovery, and notable economic co-benefits. The insights drawn from China's evolving ZWC framework not only contribute to a more sustainable and efficient waste management system domestically but also provide a valuable reference for international regions seeking to integrate industrial development with environmental protection.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100155"},"PeriodicalIF":0.0,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reducing food waste behaviors from the viewpoint of university students through the E-TPB model","authors":"Yi Li ,&nbsp;Yangyang Liang ,&nbsp;Danfeng Yu ,&nbsp;Liujie Xu ,&nbsp;Qingbin Song","doi":"10.1016/j.cec.2025.100154","DOIUrl":"10.1016/j.cec.2025.100154","url":null,"abstract":"<div><div>As a significant global issue, food waste has garnered considerable public attention because of food security and environmental sustainability. However, the current study overlooks the food waste behavior of university students in university canteens. This study, which is based on a systematic questionnaire survey of 1229 university students in Macao and Zhuhai, adopts the extended theory of planned behavior (E-TPB) to investigate the key factors influencing university students' food waste behaviors in school canteens by incorporating four additional variables. The results demonstrate that subjective norm emerged as the strongest predictor of university students' intentions, whereas intentions remained the strongest predictor of university students' food waste behavior (R² = 0.641). Among the four extended hypotheses, the economic impact and cognition of food waste have a significant effect on university students’ food waste behavior. This study revealed that increasing the level of awareness and positive attitudes toward food waste can help reduce food waste. Compared with those in Macao, the food waste behavior of respondents in Zhuhai was more influenced by the level of the economy. These research outcomes provide effective strategies for minimizing food waste within university canteens.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100154"},"PeriodicalIF":0.0,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systemic governance and circular economy synergies: A multidimensional analysis of China's “Zero-waste Cities” initiative","authors":"Yushuang Li ,&nbsp;Guijuan Shan ,&nbsp;Shuoshuo Hao ,&nbsp;Jian Li ,&nbsp;Jinhui Li","doi":"10.1016/j.cec.2025.100153","DOIUrl":"10.1016/j.cec.2025.100153","url":null,"abstract":"<div><div>China's “Zero-waste Cities” initiative, launched in 2018, represents a transformative strategy to address escalating solid waste challenges through systemic governance and circular economy principles. This study systematically examines the initiative's framework, including pilot project deployment, policy evolution, and scalability during the 14th Five-Year Plan (2021–2025). The phased implementation prioritized sector-specific models—industrial symbiosis, agricultural circularity, and smart municipal waste networks—to transition from risk control to green transformation. A SWOT analysis identifies strengths in centralized governance and technological innovation while highlighting challenges such as regional disparities in infrastructure and low market acceptance of recycled materials. Strategic recommendations emphasize data-driven governance, fiscal incentives for circular businesses, and cross-sector collaboration to bridge implementation gaps. This research underscores the initiative's dual impact: mitigating solid waste pressures and offering globally replicable insights. The framework provides a blueprint for sustainable urbanization, contributing actionable strategies to the United Nations Sustainable Development Agenda through scalable models of circular economy integration.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100153"},"PeriodicalIF":0.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing circular economy in Amazonian forest management: A comparative study of the effects of wood waste segregation and traditional carbonization on charcoal properties, combustibility, and spontaneous combustion risk","authors":"Denes de Souza Barros ,&nbsp;Michael Douglas Roque Lima ,&nbsp;Jonas Massuque ,&nbsp;Elvis Vieira dos Santos ,&nbsp;Bruna Duque Guirardi ,&nbsp;Ananias Francisco Dias Junior ,&nbsp;Lina Bufalino ,&nbsp;Edgar A. Silveira ,&nbsp;Angélica de Cássia Oliveira Carneiro ,&nbsp;Paulo Fernando Trugilho ,&nbsp;Thiago de Paula Protásio","doi":"10.1016/j.cec.2025.100152","DOIUrl":"10.1016/j.cec.2025.100152","url":null,"abstract":"<div><div>This study integrates legal timber harvesting, conservation efforts, and circular economy concepts in Amazonia by converting wood waste into charcoal via real-scale kilns in remote regions. Emphasizing the benefits of species-based segregation, residues from 23 tropical species were classified via principal component analysis into four distinct Groups (G1–G4), whereas G5 represented traditional mixed-species carbonization. A novel approach was used to assess the impact of species-based segregation on charcoal quality, combustion behavior, and logistical safety (spontaneous combustion risk) through proximate and calorific analyses, thermogravimetric analysis, combustion indices, and self-combustion experiments. To support the selection of high-performance and safer biofuels, multi-criteria decision analysis (MCDA) was applied to systematically rank charcoal groups by integrating physicochemical and thermal performance indicators. The segregated groups exhibited variations in fixed carbon (69.61–73.92%, dry basis (db)), volatile matter (21.87–27.58%, db), ash content (1.20–6.03%, db), and higher heating value (26.5–30.0 MJ·kg⁻¹). G1 (<em>Dinizia excelsa</em>) had the highest fixed carbon content, lowest ash content, and superior combustion behavior, whereas G5 had a lower ignition temperature and greater reactivity. Spontaneous combustion tests revealed no self-ignition in G1 and G4, whereas G2, G3, and G5 presented incidence rates of 75%, 50%, and 25%, respectively. MCDA enables a robust, multi-indicator evaluation of charcoal performance, producing a ranking (G1 &gt; G4 &gt; G5 &gt; G3 &gt; G2) that is consistent with the spontaneous combustion results. These findings highlight the potential of selective biomass utilization to produce higher-quality, safer, and more sustainable charcoal, reinforcing its role in circular bioenergy systems in the Amazon.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 3","pages":"Article 100152"},"PeriodicalIF":0.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}