{"paper_id":"06af4af8-2bc1-4cb3-aac2-922a288aff12","body_text":"Phosphorus recovery by a novel electrochemical process integrating siderite and calcite: Efficacy, mechanism and optimization | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Phosphorus recovery by a novel electrochemical process integrating siderite and calcite: Efficacy, mechanism and optimization Ran Mao, Ziyu Zhang, Jingwei Hao, Jiawei Tang, Weiyue Dang, Xu Zhao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7817880/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Recovering phosphorus (P) from wastewater presents a dual benefit: reducing eutrophication and supplementing finite phosphate rock resources. This study developed an integrated electrochemical fixed-bed reactor filled with siderite and calcite for enhanced P recovery. During operation, H + and OH − ions generated via electrochemical water splitting dissolve siderite and calcite in situ, while simultaneously establishing an optimal pH environment for phosphorus precipitation. By adjusting the current density and feed flow rate, the recovery process can be effectively controlled. Mechanistic investigations revealed that phosphate removal was primarily achieved through Ca–P and Fe–P precipitation, along with the formation of various Fe–Ca–P complexes. The proposed system combines the advantages of in situ electrochemical acid and alkali generation with the cost-effectiveness of natural mineral materials. It also aligns with the technical requirements of sewage treatment plants, offering a compact process and minimal chemical usage. With its flexibility and controllability, this electrochemical system holds promising potential for on-site treatment and phosphorus recovery in decentralized wastewater treatment applications. Physical sciences/Chemistry Physical sciences/Energy science and technology Physical sciences/Engineering Earth and environmental sciences/Environmental sciences Physical sciences/Materials science phosphate recovery integrated electrochemical process natural minerals precipitation Full Text Additional Declarations No competing interests reported. Supplementary Files SupportingInformation.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {\"props\":{\"pageProps\":{\"initialData\":{\"identity\":\"rs-7817880\",\"acceptedTermsAndConditions\":true,\"allowDirectSubmit\":true,\"archivedVersions\":[],\"articleType\":\"Article\",\"associatedPublications\":[],\"authors\":[{\"id\":534872596,\"identity\":\"d2fd70ec-5396-4385-9404-1c0975e24839\",\"order_by\":0,\"name\":\"Ran Mao\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Ran\",\"middleName\":\"\",\"lastName\":\"Mao\",\"suffix\":\"\"},{\"id\":534872597,\"identity\":\"b19e968b-105d-4665-a778-b55ca291299b\",\"order_by\":1,\"name\":\"Ziyu 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and calcite: Efficacy, mechanism and optimization\",\"fulltext\":[],\"fulltextSource\":\"\",\"fullText\":\"\",\"funders\":[],\"hasAdminPriorityOnWorkflow\":false,\"hasManuscriptDocX\":false,\"hasOptedInToPreprint\":true,\"hasPassedJournalQc\":\"\",\"hasAnyPriority\":false,\"hideJournal\":true,\"highlight\":\"\",\"institution\":\"\",\"isAcceptedByJournal\":false,\"isAuthorSuppliedPdf\":true,\"isDeskRejected\":\"\",\"isHiddenFromSearch\":false,\"isInQc\":false,\"isInWorkflow\":false,\"isPdf\":true,\"isPdfUpToDate\":true,\"isWithdrawnOrRetracted\":false,\"journal\":{\"display\":true,\"email\":\"info@researchsquare.com\",\"identity\":\"researchsquare\",\"isNatureJournal\":false,\"hasQc\":true,\"allowDirectSubmit\":true,\"externalIdentity\":\"\",\"sideBox\":\"\",\"snPcode\":\"\",\"submissionUrl\":\"/submission\",\"title\":\"Research 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This study developed an integrated electrochemical fixed-bed reactor filled with siderite and calcite for enhanced P recovery. During operation, H\\u003csup\\u003e+\\u003c/sup\\u003e and OH\\u003csup\\u003e\\u0026minus;\\u003c/sup\\u003e ions generated via electrochemical water splitting dissolve siderite and calcite in situ, while simultaneously establishing an optimal pH environment for phosphorus precipitation. By adjusting the current density and feed flow rate, the recovery process can be effectively controlled. Mechanistic investigations revealed that phosphate removal was primarily achieved through Ca\\u0026ndash;P and Fe\\u0026ndash;P precipitation, along with the formation of various Fe\\u0026ndash;Ca\\u0026ndash;P complexes. The proposed system combines the advantages of in situ electrochemical acid and alkali generation with the cost-effectiveness of natural mineral materials. 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