{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T03:23:17Z","timestamp":1773890597643,"version":"3.50.1"},"reference-count":53,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,3,30]],"date-time":"2024-03-30T00:00:00Z","timestamp":1711756800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["UI\/BD\/151151\/2021"],"award-info":[{"award-number":["UI\/BD\/151151\/2021"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["UIDB\/04625\/2020"],"award-info":[{"award-number":["UIDB\/04625\/2020"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["UIDB\/05703\/2020"],"award-info":[{"award-number":["UIDB\/05703\/2020"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["FBR_OC2_30"],"award-info":[{"award-number":["FBR_OC2_30"]}]},{"name":"CERIS research unit","award":["UI\/BD\/151151\/2021"],"award-info":[{"award-number":["UI\/BD\/151151\/2021"]}]},{"name":"CERIS research unit","award":["UIDB\/04625\/2020"],"award-info":[{"award-number":["UIDB\/04625\/2020"]}]},{"name":"CERIS research unit","award":["UIDB\/05703\/2020"],"award-info":[{"award-number":["UIDB\/05703\/2020"]}]},{"name":"CERIS research unit","award":["FBR_OC2_30"],"award-info":[{"award-number":["FBR_OC2_30"]}]},{"name":"CiTUA research unit","award":["UI\/BD\/151151\/2021"],"award-info":[{"award-number":["UI\/BD\/151151\/2021"]}]},{"name":"CiTUA research unit","award":["UIDB\/04625\/2020"],"award-info":[{"award-number":["UIDB\/04625\/2020"]}]},{"name":"CiTUA research unit","award":["UIDB\/05703\/2020"],"award-info":[{"award-number":["UIDB\/05703\/2020"]}]},{"name":"CiTUA research unit","award":["FBR_OC2_30"],"award-info":[{"award-number":["FBR_OC2_30"]}]},{"name":"EEA Grants bilateral fund through project Shellter","award":["UI\/BD\/151151\/2021"],"award-info":[{"award-number":["UI\/BD\/151151\/2021"]}]},{"name":"EEA Grants bilateral fund through project Shellter","award":["UIDB\/04625\/2020"],"award-info":[{"award-number":["UIDB\/04625\/2020"]}]},{"name":"EEA Grants bilateral fund through project Shellter","award":["UIDB\/05703\/2020"],"award-info":[{"award-number":["UIDB\/05703\/2020"]}]},{"name":"EEA Grants bilateral fund through project Shellter","award":["FBR_OC2_30"],"award-info":[{"award-number":["FBR_OC2_30"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Recycling"],"abstract":"<jats:p>The Circular Economy emerges as an alternative to reinvent the linear production model (take\u2013make\u2013waste), focusing on reintegrating waste into the production cycle, and aiming to minimize both environmental disposal and the unrestrained extraction of raw materials. In this context, the concept of Blue Economy arises, an approach centered on preserving and valorizing marine and coastal resources. This article aims to develop a model for the circuit of bivalve shells, emphasizing the transformation of the residues into new products and identifying how these processes affect sociocultural, economic, and environmental dimensions. The methodology involved the surveying of local stakeholders directly involved in bivalve production and consumption to identify the relationship of these stakeholders with the production, marketing, and disposal of bivalves. It is concluded that biowaste has potential, and there is interest among local stakeholders in reusing it, but a lack of knowledge and connection among stakeholders ultimately leads to the devaluation of the product. The circuit of bivalves is necessary to identify value, propose correct collection, and stimulate interest in their reuse, both by other industries and by the aquaculture industry itself. Exploring the potential for reusing bivalves and mitigating their waste, as well as preventing improper disposal, could drive the development of the Blue Circular Economy in coastal regions.<\/jats:p>","DOI":"10.3390\/recycling9020027","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T13:39:37Z","timestamp":1711892377000},"page":"27","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Blue Circular Economy\u2014Reuse and Valorization of Bivalve Shells: The Case of Algarve, Portugal"],"prefix":"10.3390","volume":"9","author":[{"given":"Fernanda Caroline","family":"Magalh\u00e3es","sequence":"first","affiliation":[{"name":"CERIS, DECivil, Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisbon, Portugal"},{"name":"CiTUA, DECivil, Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"given":"Poliana","family":"Bellei","sequence":"additional","affiliation":[{"name":"CERIS, DECivil, Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4038-6748","authenticated-orcid":false,"given":"In\u00eas","family":"Flores-Colen","sequence":"additional","affiliation":[{"name":"CERIS, DECivil, Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5070-3562","authenticated-orcid":false,"given":"Eduarda Marques","family":"da Costa","sequence":"additional","affiliation":[{"name":"CEG, Institute of Geography and Spatial Planning, University of Lisbon, 1600-276 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,30]]},"reference":[{"key":"ref_1","unstructured":"Ellen MacArthur Foundation (2020, January 25). Available online: https:\/\/ellenmacarthurfoundation.org\/towards-the-circular-economy-vol-1-an-economic-and-business-rationale-for-an."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"703","DOI":"10.1016\/j.jclepro.2017.12.112","article-title":"How do scholars approach the circular economy? A systematic literature review","volume":"178","author":"Merli","year":"2018","journal-title":"J. Clean. Prod."},{"key":"ref_3","unstructured":"Comiss\u00e3o Europeia, and Conselho da Uni\u00e3o Europeia (2023, April 01). \u201cEconomia circular\u201d. Available online: https:\/\/www.consilium.europa.eu\/pt\/policies\/circular-economy\/."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"593","DOI":"10.1111\/jiec.12545","article-title":"Circular Economy Rebound","volume":"21","author":"Zink","year":"2017","journal-title":"J. Ind. Ecol."},{"key":"ref_5","unstructured":"Bocken, N.M., and Short, S.W. (2020). Handbook of Circular Economy, EE Elgar."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"100164","DOI":"10.1016\/j.crsust.2022.100164","article-title":"Green processing of seafood waste biomass towards blue economy","volume":"4","author":"Venugopal","year":"2022","journal-title":"Curr. Res. Environ. Sustain."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1016\/j.marpol.2017.10.019","article-title":"What is blue growth? The semantics of \u201cSustainable Development\u201d of marine environments","volume":"87","author":"Eikeset","year":"2017","journal-title":"Marine Policy"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"375","DOI":"10.1016\/j.marpol.2017.11.002","article-title":"Blue growth: Stakeholder perspectives","volume":"87","author":"Howard","year":"2017","journal-title":"Marine Policy"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"105528","DOI":"10.1016\/j.envint.2020.105528","article-title":"The Blue Economy and the United Nations\u2019 sustainable development goals: Challenges and opportunities","volume":"137","author":"Lee","year":"2020","journal-title":"Environ. Int."},{"key":"ref_10","unstructured":"Comiss\u00e3o Europeia (2021). The EU Blue Economy Report 2021, Publications Office of the European Union."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1186\/s12302-021-00502-1","article-title":"Challenges of the Blue Economy: Evidence and Eesearch Trends","volume":"33","year":"2021","journal-title":"Environ. Sci. Eur."},{"key":"ref_12","unstructured":"Comiss\u00e3o Europeia (2022). The EU Blue Economy Report 2022, Publications Office of the European Union."},{"key":"ref_13","unstructured":"(2023, May 01). Comiss\u00e3o de Coordena\u00e7\u00e3o e Desenvolvimento Regional do Algarve (CCDR-Alg) RIS 3 Algarve: Estrat\u00e9gia Regional de Investiga\u00e7\u00e3o e Inova\u00e7\u00e3o para a Especializa\u00e7\u00e3o Inteligente. Available online: https:\/\/issuu.com\/ccdrAlgarve\/docs\/ris3_20-06\/1."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"105433","DOI":"10.1016\/j.marpol.2022.105433","article-title":"Exploring future research and innovation directions for a sustainable blue economy","volume":"148","author":"Pace","year":"2022","journal-title":"Mar. Policy"},{"key":"ref_15","unstructured":"OECD (2020). The Circular Economy in Cities and Regions: Synthesis Report, OECD Publishing. OECD Urban Studies."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Silva, T.H., Mesquita-Guimar\u00e3es, J., Henriques, B., e Silva, F.S., and Fredel, M.C. (2019). The Potential Use of Oyster Shell Waste in New Value-Added By-Product. Resources, 8.","DOI":"10.3390\/resources8010013"},{"key":"ref_17","unstructured":"FAO (2022). The State of World Fisheries and Aquaculture 2022. Towards Blue Transformation, FAO."},{"key":"ref_18","unstructured":"DGRM (2023, April 05). Dire\u00e7\u00e3o Geral de Recursos Naturais, Seguran\u00e7a e Servi\u00e7os Mar\u00edtimos\u2014Estat\u00edsticas da Pesca 2021. Available online: https:\/\/www.dgrm.pt\/recursos-da-pesca-dgrm."},{"key":"ref_19","unstructured":"IPMA (2023, April 10). Instituto Portugu\u00eas do Mar e da Atmosfera. Lista de Esp\u00e9cies\u2014Zonas Litorais. Available online: https:\/\/www.ipma.pt\/pt\/bivalves\/docs\/files\/Lista_de_espxcies_em_18_03_2021.pdf."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1016\/j.tifs.2021.11.026","article-title":"Aquaculture as a circular bio-economy model with Galicia as a study case: How to transform waste into revalorized by-products","volume":"119","author":"Ronza","year":"2022","journal-title":"Trends Food Sci. Technol."},{"key":"ref_21","unstructured":"UNCTAD (2023, April 10). The Oceans Economy: Opportunities and Challenges for Small Island Developing States. Available online: https:\/\/unctad.org\/system\/files\/official-document\/ditcted2014d5_en.pdf."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"825","DOI":"10.1016\/S0956-053X(02)00159-9","article-title":"Chemical\u2013mechanical characteristics of crushed oyster-shell","volume":"23","author":"Yoon","year":"2003","journal-title":"Waste Manag."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"95","DOI":"10.4265\/bio.16.95","article-title":"Antimicrobial Characteristics of Heated Scallop Shell Powder and its Application","volume":"16","author":"Sawai","year":"2011","journal-title":"Biocontrol Sci."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1016\/j.jenvman.2012.04.017","article-title":"The recycling of oyster shells: An environmental analysis using Life Cycle Assessment","volume":"106","author":"Galindro","year":"2012","journal-title":"J. Environ. Manag."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1111\/raq.12225","article-title":"Shells from aquaculture: A valuable biomaterial, not a nuisance waste product","volume":"11","author":"Morris","year":"2018","journal-title":"Rev. Aquac."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Leone, R., Cal\u00e0, A., Capela, M.N., Colajanni, S., Campisi, T., and Saeli, M. (2023). Recycling Mussel Shells as Secondary Sources in Green Construction Materials: A Preliminary Assessment. Sustainability, 15.","DOI":"10.3390\/su15043547"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Siahaan, E.A., Agusman Pangestuti, R., Shin, K.H., and Kim, S.K. (2022). Potential Cosmetic Active Ingredients Derived from Marine By-Products. Mar. Drugs, 20.","DOI":"10.3390\/md20120734"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Nguyen, T.T., Soda, S., and Horiuchi, K. (2022). Removal of Heavy Metals from Acid Mine Drainage with Lab-Scale Constructed Wetlands Filled with Oyster Shells. Water, 14.","DOI":"10.3390\/w14203325"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Bamigboye, G.O., Okechukwu, U.E., Olukanni, D.O., Bassey, D.E., Okorie, U.E., Adebesin, J., and Jolayemi, K.J. (2022). Effective Economic Combination of Waste Seashell and River Sand as Fine Aggregate in Green Concrete. Sustainability, 14.","DOI":"10.3390\/su141912822"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Pece\u00f1o, B., Bakit, J., Cortes, N., Alonso-Fari\u00f1as, B., Bonilla, E., and Leiva, C. (2022). Assessing Durability Properties and Economic Potential of Shellfish Aquaculture Waste in the Construction Industry: A Circular Economy Perspective. Sustainability, 14.","DOI":"10.3390\/su14148383"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Mutalipassi, M., Esposito, R., Ruocco, N., Viel, T., Costantini, M., and Zupo, V. (2021). Bioactive Compounds of Nutraceutical Value from Fishery and Aquaculture Discards. Foods, 10.","DOI":"10.3390\/foods10071495"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Amenorfenyo, D.K., Huang, X., Zhang, Y., Zeng, Q., Zhang, N., Ren, J., and Huang, Q. (2019). Microalgae Brewery Wastewater Treatment: Potentials, Benefits and the Challenges. Int. J. Environ. Res. Public Health, 16.","DOI":"10.3390\/ijerph16111910"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Bellei, P., Torres, I., Solstad, R., and Flores-Colen, I. (2023). Potential Use of Oyster Shell Waste in the Composition of Construction Composites: A Review. Buildings, 13.","DOI":"10.3390\/buildings13061546"},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Bellei, P., Magalh\u00e3es, F., Pereira, M., Torres, I., Solstad, R., and Flores-Colen, I. (2023). Innovative Thermal Renders Incorporating Oyster Shells for Sustainable Insulation. Sustainability, 15.","DOI":"10.3390\/su152215952"},{"key":"ref_35","unstructured":"Magalh\u00e3es, F., Bellei, P., Costa, E.M., Torres, I., and Flores-Colen, I. (2024, January 7\u201310). Recovering Mortar Production Techniques Using Oyster Shells in Coastal Regions. Proceedings of the Rehabend\u2014Construction Pathology, Rehabilitation Technology and Heritage Management, Asturias, Spain."},{"key":"ref_36","unstructured":"Fernandes, D.R. (2015). Uma Vis\u00e3o Sobre a An\u00e1lise da Matriz SWOT como Ferramenta para Elabora\u00e7\u00e3o da Estrat\u00e9gia. Rev. De Ci\u00eancias Jur\u00eddicas Empres., 13."},{"key":"ref_37","unstructured":"APA Ag\u00eancia Portuguesa do Ambiente (2017). Boas Pr\u00e1ticas em Cultivo de Ostra\u2014Algarve, APA. Available online: https:\/\/www.researchgate.net\/publication\/317413680_Boas_praticas_em_cultivo_de_ostra_-_Algarve."},{"key":"ref_38","unstructured":"(2024, January 15). EEA Grants Portugal, Available online: https:\/\/www.eeagrants.gov.pt\/pt\/programas\/fundo-de-relacoes-bilaterais\/noticias\/como-aumentar-o-potencial-de-utilizacao-de-residuos-de-conchas-de-ostras-em-materiais-de-construcao\/."},{"key":"ref_39","unstructured":"DGRM Dire\u00e7\u00e3o Geral de Recursos Naturais, Seguran\u00e7a e Servi\u00e7os Mar\u00edtimos (2023, June 01). Estat\u00edstica da Pesca 2022. Available online: https:\/\/www.ine.pt\/xportal\/xmain?xpid=INE&xpgid=ine_publicacoes&PUBLICACOESpub_boui=66322600&PUBLICACOESmodo=2."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"4","DOI":"10.1016\/j.wmb.2023.04.001","article-title":"Municipal solid waste: Opportunities, challenges and management policies in India: A review","volume":"1","author":"Meena","year":"2023","journal-title":"Waste Manag. Bull."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1080\/10042857.2009.10684947","article-title":"Promoting Sustainability with Ecological, Economic and Social Dimensions in Developing Countries","volume":"7","author":"Khajuria","year":"2013","journal-title":"Chin. J. Popul. Resour. Environ."},{"key":"ref_42","unstructured":"UNEP (2017). Resource Efficiency: Potential and Economic Implications. A Report of the International Resource Panel, UNESCO."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"396","DOI":"10.1038\/s41586-021-03327-3","article-title":"Enabling conditions for an equitable and sustainable blue economy","volume":"591","author":"Reygondeau","year":"2021","journal-title":"Nature"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"105476","DOI":"10.1016\/j.resconrec.2021.105476","article-title":"There is no sustainable circular economy without a circular society","volume":"168","author":"Jensen","year":"2021","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Zhao, Z., Li, Y., and Du, Z. (2022). Seafood Waste-Based Materials for Sustainable Food Packing: From Waste to Wealth. Sustainability, 14.","DOI":"10.3390\/su142416579"},{"key":"ref_46","unstructured":"CCDR\u2014Alg (2008). Agenda Regional do Mar Algarve. Contributos para o Plano de Ac\u00e7\u00e3o para o Cluster Mar Algarve, CCDR-Alg."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"105621","DOI":"10.1016\/j.resconrec.2021.105621","article-title":"Circular economy-induced global employment shifts in apparel value chains: Job reduction in apparel production activities, job growth in reuse and recycling activities","volume":"171","author":"Repp","year":"2021","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1016\/j.cosust.2010.03.005","article-title":"Challenges in framing the economics of ecosystems and biodiversity: The TEEB initiative","volume":"2","author":"Ring","year":"2010","journal-title":"Curr. Opin. Environ. Sustain."},{"key":"ref_49","unstructured":"CCDR\u2014Alg (2023, May 01). Comiss\u00e3o de Coordena\u00e7\u00e3o e Desenvolvimento Regional do Algarve. Plano Regional de Ordenamento do Territ\u00f3rio (PROT). Available online: https:\/\/prot.ccdr-alg.pt\/."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1038\/531435a","article-title":"The circular economy\u2014A new relationship with our goods and materials would save resources and energy and create local jobs","volume":"531","author":"Stahel","year":"2016","journal-title":"Nature"},{"key":"ref_51","unstructured":"(2023, May 01). PO Mar 2020. Pograma Operacional do Fundo Europeu dos Assuntos Mar\u00edtimos, das Pescas e Aquicultura\u2014Programa para Portugal\u2014MAR2020. Available online: https:\/\/mar2020.blob.core.windows.net\/mar2020\/2021\/08\/Brochura-MAR2020.pdf."},{"key":"ref_52","unstructured":"(2021). Estrat\u00e9gia Nacional para o Mar 2021\u20132030 (Standard No. ENM 2021-2030). Available online: https:\/\/www.dgpm.mm.gov.pt\/enm-21-30."},{"key":"ref_53","unstructured":"(2023, May 20). PO Mar 2030. Pograma Operacional do Fundo Europeu dos Assuntos Mar\u00edtimos, das Pescas e Aquicultura\u2014Programa para Portugal\u2014MAR2030. Available online: https:\/\/backoffice-mar2030.uppout.com\/\/uploads\/Programa_FEAMPA_cd98a6f16d.pdf."}],"container-title":["Recycling"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2313-4321\/9\/2\/27\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:21:24Z","timestamp":1760106084000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2313-4321\/9\/2\/27"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,3,30]]},"references-count":53,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2024,4]]}},"alternative-id":["recycling9020027"],"URL":"https:\/\/doi.org\/10.3390\/recycling9020027","relation":{},"ISSN":["2313-4321"],"issn-type":[{"value":"2313-4321","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,30]]}}}