Circular Economy最新文献

{"title":"Metallic product recognition with dual attention and multi-branch residual blocks-based convolutional neural networks","authors":"Honggui Han ,&nbsp;Qiyu Zhang ,&nbsp;Fangyu Li ,&nbsp;Yongping Du ,&nbsp;Yifan Gu ,&nbsp;Yufeng Wu","doi":"10.1016/j.cec.2022.100014","DOIUrl":"10.1016/j.cec.2022.100014","url":null,"abstract":"<div><p>Visual recognition technologies based on deep learning have been gradually playing an important role in various resource recovery fields. However, in the field of metal resource recycling, there is still a lack of intelligent and accurate recognition of metallic products, which seriously hinders the operation of the metal resource recycling industry chain. In this article, a convolutional neural network with dual attention mechanism and multi-branch residual blocks is proposed to realize the recognition of metallic products with a high accuracy. First, a channel-spatial dual attention mechanism is introduced to enhance the model sensitivity on key features. The model can focus on key features even when extracting features of metallic products with too much confusing information. Second, a deep convolutional network with multi-branch residual blocks as the backbone while embedding a dual-attention mechanism module is designed to satisfy deeper and more effective feature extraction for metallic products with complex characteristic features. To evaluate the proposed model, a waste electrical and electronic equipment (WEEE) dataset containing 9266 images in 18 categories and a waste household metal appliance (WHMA) dataset containing 11,757 images in 23 categories are built. The experimental results show that the accuracy reaches 94.31% and 95.88% in WEEE and WHMA, respectively, achieving high accuracy and high quality recycling.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 2","pages":"Article 100014"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000140/pdfft?md5=13a787cc567184762ed8c2089983fa84&pid=1-s2.0-S2773167722000140-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77539343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"State-of-the-art lithium-ion battery recycling technologies","authors":"Muammer Kaya","doi":"10.1016/j.cec.2022.100015","DOIUrl":"10.1016/j.cec.2022.100015","url":null,"abstract":"<div><p>Lithium (Li) is primarily found in mineral resources, brines, and seawater. Extraction of Li from mineral ore deposits is expensive and energy-intensive. Li-ion batteries (LIBs) are certainly one of the important alternatives to lessen the dependence on fossil fuel resources. The global demand for LIBs for portable electrical and electronic equipment (EEE) and EVs have increased significantly, and the amount of spent LIBs (S-LIBs) is rising logarithmically. S-LIBs contain both hazardous heavy metals and toxic organic chemicals that create a serious threat to human health and the ecosystem. The current position requires the recycling of S-LIBs indispensable for the protection of the environment and the recycling of scarce raw materials from economic aspects. In this manuscript, recent developments and state-of-the-art technologies for LIB recycling were focused on and reviewed comprehensively. Pretreatment methods (such as discharging, dismantling, cathode active material (CAM) removal, binder elimination methods, classification, and separation) for S-LIBs are introduced, and all available and novel technologies that are used in different physical and chemical recovery processes are summarized and compared. The pretreatment process in LIB recycling can both improve the recovery rate of the valuable components and significantly lessen the subsequent energy consumption. Notably, pretreatment, metal extraction, and product preparation stages play vital roles in all LIB recovery processes, based on pyrometallurgy, hydrometallurgy, biometallurgy, direct recycling, and mechanical treatment and water leaching. The main goal of this review is to address the novel S-LIB materials’ current recycling research status and innovations for integrated, eco-friendly, economic, low carbon, and clean energy technologies. In the end, different industrial recycling processes are compared, existing challenges are identified and suggestions and perspectives for future LIBs recycling applications are highlighted.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 2","pages":"Article 100015"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000152/pdfft?md5=fc1ebeb19cae206fc8090b1d8b8ad1b7&pid=1-s2.0-S2773167722000152-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83661420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Circular Economy and Natural Capital in the Tourism and Hospitality Industry","authors":"Peter Jones, M. Wynn","doi":"10.55845/irvu6231","DOIUrl":"https://doi.org/10.55845/irvu6231","url":null,"abstract":"There is growing interest in the role that the circular economy and natural capital might play in the transition to a more sustainable tourism and hospitality industry. While both concepts have attracted attention in the academic, professional and policy literature, few leading tourism and hospitality companies have publicly embraced the two concepts to inform their sustainability programmes. This paper is a narrative review that reports and reflects upon the existing literature, and offers two illustrative case examples of how hotel companies are publicly addressing these concepts. The paper concludes that the circular economy and the protection and enhancement of natural capital offer linked environmental and business benefits for the tourism and hospitality industry, but that, for a number of reasons, there is limited evidence that the two concepts have informed sustainability programmes within the sector. Further research could usefully build upon this study to examine, amongst other aspects, stakeholder involvement in pressuring companies to pursue circular economy and natural capital objectives, the role of digital technologies in supporting this transition, and the wider supply chain implications of such initiatives","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78180267","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":"Process performance measurement framework for circular supply chain: An updated SCOR perspective","authors":"Laura Montag, Tom Pettau","doi":"10.55845/kaiz3670","DOIUrl":"https://doi.org/10.55845/kaiz3670","url":null,"abstract":"This paper presents a theoretical and conceptual approach for measuring the supply chain’s performance in the circular economy era. Since not only economic but also environmental, social, and especially circularity performance must be measured within circular supply chains, adapted performance measurement systems are required. The proposed performance measurement system is based on a SCOR model adapted for circular supply chains (including the processes use and recover) and provides a comprehensive composition of indicators to holistically measure the supply chain’s performance from an economic, environmental, social, and circular perspective.","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"138 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80551559","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":"Feasibility study on using excavated soil and rock to sintering utilization","authors":"Jing Bai ,&nbsp;Peng Kang ,&nbsp;Wenbo Zhang ,&nbsp;Kunyang Chen ,&nbsp;Yu Zhang ,&nbsp;Ding Zhou ,&nbsp;Huabo Duan","doi":"10.1016/j.cec.2022.100007","DOIUrl":"https://doi.org/10.1016/j.cec.2022.100007","url":null,"abstract":"<div><p>Urban construction, especially the ongoing large-scale expansion and utilization of underground space, has resulted in massive excavated soil and rock (ESR) from buildings and subways. Therefore, this study aims to explore the technical ways of ESR sintering utilization from the perspective of technology, environment, and policy through qualitative and quantitative methods. The study analyzes the soil properties and distribution of different depths, and the annual production of clay-rich ESR accounts for about 30 million m³ in Shenzhen. More importantly, the comparison between various pollutant concentrations of ESR in Shenzhen and local soil background values showed that the ESR in Shenzhen had no environmental risks. This study can not only provide a scientific basis for ESR as the raw material of sintering but also provide a theoretical basis for the promotion of the pilot of “Zero waste city”.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 1","pages":"Article 100007"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000073/pdfft?md5=bf6994383b1af744ca7afa9af83b8859&pid=1-s2.0-S2773167722000073-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89995249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reshaping global policies for circular economy","authors":"Xianlai Zeng ,&nbsp;Oladele A. Ogunseitan ,&nbsp;Shinichiro Nakamura ,&nbsp;Sangwon Suh ,&nbsp;Ulrich Kral ,&nbsp;Jinhui Li ,&nbsp;Yong Geng","doi":"10.1016/j.cec.2022.100003","DOIUrl":"https://doi.org/10.1016/j.cec.2022.100003","url":null,"abstract":"<div><p>Circular economy is recognized as a powerful integrative framework envisioned to solve societal problems linked to environmental pollution and resource depletion. Its adoption is rapidly reforming manufacturing, production, consumption, and recycling across various segments of the economy. However, circular economy may not always be effective or even desirable owing to the spatiotemporal dimensions of environmental risk of materials, and variability of global policies. Circular flows involving toxic materials may impose a high risk on the environment and public health such that overemphasis on anthropogenic circularity is not desirable. Moreover, waste flows at a global scale might result in an uneven distribution of risks and costs associated with a circular economy. Among other benefits, circular economy needs to generate environmental advantages, energy savings, and reductions of greenhouse gas emissions. Recent attempts to implement the carbon neutrality strategy globally will likely push the circular economy further into more economic sectors, but challenges remain in implementing and enforcing international policies across national boundaries. The United Nations Basel Convention on the Transboundary Movement of Hazardous Waste and their disposal is used here as an example to illustrate the challenges and to propose a way forward for anthropogenic circularity.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 1","pages":"Article 100003"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000036/pdfft?md5=396b1902acf2092419dc0cb71b671574&pid=1-s2.0-S2773167722000036-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91609069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The dynamic stock-flow and driving force analysis of the building metal and non-metal resources at a city scale: An empirical study in Macao","authors":"Yuqiong Long ,&nbsp;Zheng Li ,&nbsp;Qingbin Song ,&nbsp;Kaihan Cai ,&nbsp;Quanyin Tan ,&nbsp;Guiming Yang","doi":"10.1016/j.cec.2022.100004","DOIUrl":"https://doi.org/10.1016/j.cec.2022.100004","url":null,"abstract":"<div><p>The construction industry is often seen as one of the most dynamic sectors, referring to large resource consumption and waste generation, and has grown rapidly in the last few decades. Under the background of “Zero Waste City,” it will be essential to understand the metabolic stock-flow process and the driving forces of urban building resources. By combining the top-down and bottom-up methods, this study establishes a dynamic material flow analysis (MFA) model to clarify the stock and flow characteristics, driving forces, and future trends of urban building resources in Macao China. The result shows that the total material stock increased from 14.13 million metric tons (Mt) in 1999 to 32.75 Mt in 2018, with an average annual growth rate of 4.29%. In 2018, metal resources accounted for 10.73% of the total building stock (steel and aluminum resources accounted for 10.30% and 0.43%, respectively), and non-metal resources accounted for 89.27%. The construction demolition waste (CD&amp;W) increased from 0.02 Mt in 1999 to 0.69 Mt in 2018. Among metal materials, steel and aluminum accounted for 7.11% and 0.4%, respectively. The demolition quantity of metal resources increased from 1.6 kilotons (kt) in 1999 to 51.8 kt in 2018 (an average annual increase of 1.59%) and peaked at 95.2 kt in 2007. The IPAT (I-environment impact; P-population factor; A-social affluence factor; T-technology factor) method results show that the economy and population are always the driving force for urban building resources stock in Macao China. The scenario analysis shows that, by 2035, the maximum stock of urban building materials in Macao will reach 65.19 Mt, about twice in 2018. The results are expected to provide a theoretical basis for establishing scientific resource management and recycling systems for urban buildings.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 1","pages":"Article 100004"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000048/pdfft?md5=42d7e4778dd4df671adef74f2e827dbc&pid=1-s2.0-S2773167722000048-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91609570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Circular economy towards zero waste and decarbonization","authors":"Jinhui Li,&nbsp;Guochang Xu","doi":"10.1016/j.cec.2022.100002","DOIUrl":"https://doi.org/10.1016/j.cec.2022.100002","url":null,"abstract":"","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 1","pages":"Article 100002"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000024/pdfft?md5=7579f8c26788eb28d60aaf48cef923e4&pid=1-s2.0-S2773167722000024-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91609542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving aluminium resource efficiency in China: Based upon material flow analysis and entropy analysis","authors":"Guimei Zhao ,&nbsp;Yong Geng ,&nbsp;Chao Tang ,&nbsp;Han Hao ,&nbsp;Raimund Bleischwitz ,&nbsp;Xu Tian","doi":"10.1016/j.cec.2022.100005","DOIUrl":"https://doi.org/10.1016/j.cec.2022.100005","url":null,"abstract":"<div><p>Aluminium is one widely used metal that plays an important role in China's industrial and economic development. The life cycles of aluminium products involve high energy inputs, intensive material consumption and heavy environmental emissions. China has released its ambitious climate change targets, namely reaching carbon peak in 2030 and achieving carbon neutrality in 2060. It is therefore urgent to take appropriate actions to reduce the overall greenhouse gas emissions from aluminium production and increase resource efficiency along the entire aluminium life cycle. Under such circumstances, this study aims to explore China's aluminium recycling potential through dynamic material flow analysis for the period of 2000–2019, covering its whole life cycle and including relevant international trade activities. An entropy analysis method is also applied to identify optimal pathways to improve aluminum resource efficiency and circularity. Results indicate that China has experienced fast growth of aluminum production and consumption during the last two decades, with its output of primary aluminium increasing from 4.18 Mt in 2000 to 35.11 Mt in 2019 and its aluminium consumption increasing from 2.99 Mt in 2000 to 32.5 Mt in 2019. Such rapid growth has resulted in significant environmental impacts. For instance, environmental loss of aluminium at the production stage accounted for 46% of the total loss throughout its entire life cycle in 2000, while such a rate increased to 69% in 2019. As such, entropy analysis results reflect that at the stage of waste management, the relative entropy of aluminium is rising, which indicates that any pollutants discharged into the environment will cause significant damage. Scenarios analysis results further help to identify the optimal pathway of aluminium metabolism system. Finally, several policy recommendations are proposed to improve the overall aluminium resource efficiency.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 1","pages":"Article 100005"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277316772200005X/pdfft?md5=61661e2fc3adca2e0c7ee13a88dae6bd&pid=1-s2.0-S277316772200005X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91609070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accelerating circular economy solutions to achieve the 2030 agenda for sustainable development goals","authors":"Anupam Khajuria ,&nbsp;Vella A. Atienza ,&nbsp;Suchana Chavanich ,&nbsp;Wilts Henning ,&nbsp;Ishrat Islam ,&nbsp;Ulrich Kral ,&nbsp;Meng Liu ,&nbsp;Xiao Liu ,&nbsp;Indu K. Murthy ,&nbsp;Temitope D. Timothy Oyedotun ,&nbsp;Prabhat Verma ,&nbsp;Guochang Xu ,&nbsp;Xianlai Zeng ,&nbsp;Jinhui Li","doi":"10.1016/j.cec.2022.100001","DOIUrl":"10.1016/j.cec.2022.100001","url":null,"abstract":"<div><p>Circular economy seems a vital enabler for sustainable use of natural resources which is also important for achieving the 2030 agenda for sustainable development goals. Therefore, a special session addressing issues of “sustainable solutions and remarkable practices in circular economy focusing materials downstream” was held at the 16th International Conference on Waste Management and Technology, where researchers and attendees worldwide were convened to share their experiences and visions. Presentations focusing on many key points such as new strategies, innovative technologies, management methods, and practical cases were discussed during the session. Accordingly, this article compiled all these distinctive presentations and gave insights into the pathway of circular economy towards the sustainable development goals. We summarized that the transition to circular economy can keep the value of resources and products at a high level and minimize waste production; the focus of governmental policies and plans with the involvement of public-private-partnership on 3Rs (reduce, reuse, and recycle) helps to improve the use of natural resources and take a step ahead to approach or achieve the sustainability.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"1 1","pages":"Article 100001"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773167722000012/pdfft?md5=750807146b826a20861a1aae5767b8b3&pid=1-s2.0-S2773167722000012-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79950746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}