Circular Economy最新文献

{"title":"Circular use of fine-grained tailings to underground mine wind walls","authors":"Enming Li ,&nbsp;Bin Xi ,&nbsp;Ning Zhang ,&nbsp;Xiuzhi Shi ,&nbsp;Jian Zhou ,&nbsp;Pablo Segarra ,&nbsp;Hongzhou Wang","doi":"10.1016/j.cec.2023.100053","DOIUrl":"https://doi.org/10.1016/j.cec.2023.100053","url":null,"abstract":"<div><p>Mining activities tend to generate various waste including tailings, waste water and waste rock. Efficient management and disposal of these waste materials are critical to minimize their environmental impact and ensure the sustainable operation of mining activities. A huge number of tailings are produced all around the world each year. Generally, part of the tailings is used for underground backfilling and another part is discharged to the tailings dam. The former can provide underground support while the latter tends to cause some environmental problems because the tailings are generally mixed with some chemicals. Regarding this, enhancing the circular use of tailings is crucial to guarantee the sustainable mining engineering. In this study, the feasibility of using fine-grained tailings to make non-burning hollow bricks for underground windbreaks is investigated. A two-stage experiment was implemented where the first stage experiment indicated the threshold of water content, the ratio of cement and tailings and the ratio of fine-grained and rod-mill tailings. In addition, it can be indicated that the addition of polyethylene fibers would increase the compressive strength of hollow bricks in some extent. The second-stage experiment was conducted with no rod-mill tailing added and it can be found that when the ratio of cement and tailings is equal or higher than 1:6, fiber content is more significant in improving brick strength but when this value is lower, the ratio of cement is more important than fiber factors. When the ratio of cement and fine-grained tailings is 1:8 with 0.5 g/kg and 12 mm polypropylene fiber added, the hollow brick is capable of achieving strength of 1.4 MPa for 28 days curation with the price of 0.50 RMB/block. This proportioning scheme is the least expensive while meeting the strength of the windbreak wall for the Fan Kou lead–zinc mine. Finally, it can be indicated that the usage of fine-grained tailings to make underground windbreak wall is feasible and thus provide a new scenario to circular usage of tailings. In addition, other proportioning schemes proposed in this study perhaps can meet more engineering requirements so as to provide more alternatives for circular use of tailings.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"2 3","pages":"Article 100053"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50194582","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":"Consumer perceptions and behaviors toward take-out food plastic packaging reduction: A case study of college students in China","authors":"Yusheng Guan ,&nbsp;Fan Wei ,&nbsp;Sijie Liu ,&nbsp;Quanyin Tan ,&nbsp;Jinhui Li","doi":"10.1016/j.cec.2023.100052","DOIUrl":"https://doi.org/10.1016/j.cec.2023.100052","url":null,"abstract":"<div><p>With the prevalence of online take-out food, the increasingly generated single-use plastic packaging waste has aroused public concern in the context of combating plastic pollution globally. The majority of present studies have focused on product design and policy design to influence the corporate behaviors in packaging waste management. Few attentions have been concentrated on consumer perceptions, a neglected vital factor in commercial practices, which determines whether the proposed measures can be effectively applied. This study takes college students, the main consumer group of take-out who are most likely to receive new environmental protection concepts, as a case study and employs the contingent valuation method to investigate their perceptions and behaviors toward emerging plastic packaging reduction approaches and taxation mechanisms. It was found that packaging circulation was preferred mostly with a proportion of 73.20% of the respondents, while taxation mechanism was more favored by those who have higher daily expenditure on meals. Gender, living costs and ordering frequency could significantly influence the acceptance levels. Therefore, a circulation mechanism using cabinet near take-out food hot spots and third-party cleaning services could target students and officers as pioneers. Regarding the taxation approach, it was suggested that the payment that most of the respondents could accept is 1.5 CNY. This study serves as a reference for the reduction of plastic waste from take-out packaging on campus, and provides a possible model that could reduce the environmental impacts of take-out food packaging through both taxation and circulation measures. The findings are expected to bring primary insights for take-out food plastic packaging reduction in China. For future studies, the methodology of this study was also well-prepared to investigate a larger scale of consumers and develop a more universal policy.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"2 3","pages":"Article 100052"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50194584","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":"The challenge of introducing design for the circular economy in the electronics industry: A proposal for metrics","authors":"Ab Stevels","doi":"10.1016/j.cec.2023.100051","DOIUrl":"https://doi.org/10.1016/j.cec.2023.100051","url":null,"abstract":"<div><p>The introduction of design for the circular economy (DfCE) in the electronics industry can strongly build on the earlier experiences in the field of applied ecodesign. Although the design methodology DfCE as such is identical compared to traditional ecodesign, DfCE needs different metrics because it includes apart from the environmental dimension also supply criticality and recyclability. Such metrics are proposed in the present paper. These will allow to come to prioritized action agendas for DfCE. Moreover, the numbers will allow to position the actions appropriately in the internal and external value chains. The basis for such metrics is to assign to each individual material in a product a weight based resource factor (RF). Such RFs include ‘factors’ for supply criticality, environmental load and recyclability. This allows to calculate ‘consolidated’ RFs for products as well. This approach will very effective in promoting circularity, because it starts from its core. That is: looking to how (and why) specific materials are applied and using a numerical method to put this into perspective. Primarily this is helpful to address the internal value chain. Also supply side issues and demand side issues (consumers) will get a lot of attention in this paper, both at the front side (design) and the back side (discarding behaviour of users). The combination of both aspects will allow to come to develop the best strategies for reuse for different product groups. For the informal sector application of the metrics is still premature, but in future there could be contributions as well. In the discussion section, issues are raised as regards possible contradictions between resource issues and emission issues and about conflicts of interest between DfCE and business interest in more general. Moreover, attention is paid to the way DfCE can contribute to enrich traditional ecodesign.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"2 3","pages":"Article 100051"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50194583","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":"Valorization of agro-industrial biowaste to biomaterials: An innovative circular bioeconomy approach","authors":"Bishwambhar Mishra ,&nbsp;Yugal Kishore Mohanta ,&nbsp;C. Nagendranatha Reddy ,&nbsp;S. Deepak Mohan Reddy ,&nbsp;Sanjeeb Kumar Mandal ,&nbsp;Rajasri Yadavalli ,&nbsp;Hemen Sarma","doi":"10.1016/j.cec.2023.100050","DOIUrl":"https://doi.org/10.1016/j.cec.2023.100050","url":null,"abstract":"<div><p>Population growth and increased food demand have increased global waste. Converting biowaste into biomaterials has been the subject of extensive research, and various strategies have been investigated. Microorganisms can ferment a large amount of useable carbon in biowaste from the food and agricultural industries to produce valuable goods. Those who advocate for a “circular bioeconomy” aim to establish a system that eliminates waste by recycling and reusing its components. Various novel biomaterials, such as collagen, chitosan, pullulan, hydroxyapatite, cellulose, gelatin, and carbon-based nanocomposites, can be derived from biowaste through bioprocessing. This paper demonstrates to what extent we have succeeded in transforming biowaste into biomaterials with commercial value. Furthermore, this article discusses the most recent developments in waste valorization and circular economy concepts and the promising future of transforming agro-industrial wastes into functional biomaterials and their applications.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"2 3","pages":"Article 100050"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50194579","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":"Energy market dynamics and institutional sustainability: How affect the Europe's circular economy","authors":"George Hondroyiannis ,&nbsp;Eleni Sardianou ,&nbsp;Vasilis Nikou ,&nbsp;Konstantinos Evangelinos ,&nbsp;Ioannis Nikolaou","doi":"10.1016/j.cec.2023.100048","DOIUrl":"https://doi.org/10.1016/j.cec.2023.100048","url":null,"abstract":"<div><p>This paper considers socioeconomic, environmental, institutional and demographic issues necessary for the circular economy (CE) transition, employing a sample of 27 European Union (EU) countries and the UK using panel data method. Environmental degradation, asymmetry and inequality in the recovery conditions from the COVID-19 pandemic, which have been particularly aggravated over the last three years (2019–2022), as well as the energy crisis in the Eurozone raise significant challenges for social cohesion and CE policies. This analysis aims to examine whether a change in the structure of the energy markets, densely populated areas, environmental performance, institutional quality, social protection and innovation affect the CE. The results reveal that circular activity is robustly and positively affected by factors such as institutional quality, resource productivity and entrepreneurship. As the level of social protection increases, the percentage of the population willing to adopt the CE principles increases, while EU countries consume more raw materials than they can actually recycle. An increase of 1% in the market share of the largest electricity production companies and the market share of companies supplying the largest volume of natural gas is linked to a reduction of 0.30% and 0.33%, respectively, in the circularity rate. This suggests that under imperfect competition in energy markets, there are signs of undermining the efforts of EU countries to collect waste for recovery.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"2 3","pages":"Article 100048"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50194580","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":"A bi-objective decision support tool based on system dynamics and discrete event modelling for sustainable supply chain","authors":"Jia Yu, Trung Hieu, Simon Gray, Adriana Encinas-Oropesa","doi":"10.55845/sddh3833","DOIUrl":"https://doi.org/10.55845/sddh3833","url":null,"abstract":"Based on the development trend of sustainable concepts and the implement ability of composites combined with Agave Bagasse Fibre (ABF) and Polyethylene Terephthalate (PET). The purpose of this paper is to design a bi-objective decision support tool for supply chain of composite material which combined with ABF and PET. Through the production, processing, recycling, and reprocessing of composite materials, the sustainable supply chain model of four different schemes is designed, and the data results of each scheme model are calculated and analysed. The tool can support supply chain modelling solutions that seek best practices for sustainable supply chains and optimize resource efficiency through cost and carbon dioxide emissions. The sustainable supply chain model was designed, created, and optimized in AnyLogic software using System Dynamics and Discrete Event Simulation modelling methods based on the supply chain model established by previous researchers. According to the analysis results of the model data, the reasonable design of the whole process can effectively reduce the cost and carbon dioxide emissions and achieve the effectiveness and implementation of the sustainable supply chain. The results of this study will provide reference for more sustainable supply chain models in the future. Further research on composite materials can be carried out by combining with practice.","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78541489","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":"Narrating the Interplay Between Circular Economy (CE) and Ecological Transition: A Social and Cultural Perspective from CE Experiments in Kamouraska (Quebec) and La Rochelle (France)","authors":"Chedrak Chembessi, C. Beaurain, G. Cloutier","doi":"10.55845/tyet5083","DOIUrl":"https://doi.org/10.55845/tyet5083","url":null,"abstract":"This article examines how local circular economy (CE) initiatives can help to address ecological transition issues. From semi-structured interviews with various stakeholders of two local CE experiments in France and Quebec, we reveal that local CE experiments prioritize environmental impact and economic performance while often neglecting the social and cultural dimensions of the ecological transition. Consequently, we underscore diverse opportunities and levers for CE to foster these dimensions of ecological transition. We propose potential strategies and prerequisites for connecting CE experiments with the broader ecological transition, explicitly focusing on incorporating social and cultural perspectives.","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88463260","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":"Linking Circular Innovation with ‘Open Innovation’ Paradigm: A Stakeholder Approach","authors":"Małgorzata Runiewicz-Wardyn","doi":"10.55845/utds4006","DOIUrl":"https://doi.org/10.55845/utds4006","url":null,"abstract":"The paper aims to investigate how open innovations (OI) paradigm, based on the principle of the collaboration between the innovation ecosystem stakeholders can contribute to the adoption and promotion of the circular economy (CE). The engagement in the knowledge, technology and resource sharing between the Quadruple Helix (QH) stakeholders – enterprises, academia, society, government - is crucial for the transition to the CE model. The paper introduces the concept of the open circular innovation ecosystem (OCIE), its key stakeholders as well as discusses the drivers and barriers leading to the successful OCIE.","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73448594","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":"QR Code-Based Material Passports for Component Reuse Across Life Cycle Stages in Small-Scale Construction","authors":"Brandon S. Byers, C. De Wolf","doi":"10.55845/iweb6031","DOIUrl":"https://doi.org/10.55845/iweb6031","url":null,"abstract":"The rise of attention to the circular economy in the built environment faces a pervasive problem that buildings are designed to last longer than the careers of those who built them. Predicting how to best preserve and convey information on building construction and materials from the beginning to the end of life is difficult. This paper explores the impact of track and trace technology, specifically quick-response (QR) codes, on reusing elements at the end of a building’s life. In two case studies, we tested the effectiveness of using a material passport (MP) in small-scale construction, providing insights into the digital and physical processes. Ultimately, QR codes are shown to be good stores of static information but are not optimized for dynamic process information during construction life cycles. Despite the challenges of ensuring sustainable, circular construction, the results of this study should motivate those in the construction industry to implement and improve these processes in anticipation of future policy, environmental, and economic demands.","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"157 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86342129","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":"Generation and management of municipal solid waste in top metropolitans of China: A comparison with Singapore","authors":"Hongping He ,&nbsp;Xiaofeng Gao ,&nbsp;Xunchang Fei","doi":"10.1016/j.cec.2023.100041","DOIUrl":"https://doi.org/10.1016/j.cec.2023.100041","url":null,"abstract":"<div><p>With the rapid urbanization in the last decades, especially after the year 2000, several metropolitans were formed. e.g., Beijing, Shanghai, Guangzhou, Shenzhen, Tianjin, and Chongqing that locate at four world-class megalopolises across China. The generation and management of municipal solid waste (MSW) are important components for city development, both of which are spatiotemporally heterogeneous among these metropolitans, as a result of diverse socioeconomic statuses. This study attempts to sufficiently reveal the spatiotemporal heterogeneity by determining the MSW per capita, MSW composition, and proportion of each management strategy (landfilling, incineration, and compositing). Singapore is taken for comparison, for it is a Chinese community and well-known for its outstanding performance in environmental sanitation. Results show that MSW per capita is highly dependent on GDP per capita, and exerts an increasing tendency with time, but can be relieved with MSW reduction policy. For each metropolitan, the development of landfilling and incineration fits the Kuznets curve well, and government policy is a more determinant factor than GDP. MSW composition is also time- and location-dependent, and source sorting generally favors the subsequent resource utilization including the mainstream incineration. In addition to MSW generation and management, the action, goal, and experience in Singapore are expatiated, which are believed to be of referential significance for these metropolitans.</p></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"2 2","pages":"Article 100041"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50183928","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}