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This study evaluated ceramic membrane ultrafiltration for separating biogenic sulfur from membrane biofilm reactor effluent's supernatant using 50\u2010, 150\u2010, and 300\u2010kDa membranes under varying transmembrane pressure and crossflow velocity. All conditions achieved high sulfur rejection (95.9%\u201398.1%), whereas normalized flux declined to 0.06\u20130.26, showing that hydraulic performance was controlled by fouling rather than particle retention. Response\u2010surface analysis identified the 50\u2010kDa membrane as the best compromise between rejection and fouling resistance. Cyclic filtration with cleaning showed partial reversibility, with flux recovery of 86.1%, 83.1%, and 107.5% after three cycles. Interval\u2010averaged Hermia analysis indicated mixed\/sequential fouling, with cake\/gel filtration providing the best global fit and intermediate blocking remaining competitive. Cleaning reduced the estimated membrane\u2010area penalty factor from 3.8\u00d7 to 16.7\u00d7 to approximately 1.8\u00d7 to 4.4\u00d7, supporting design based on sustained fouled flux.<\/jats:p>","DOI":"10.1002\/wer.70512","type":"journal-article","created":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T09:13:30Z","timestamp":1785402810000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ceramic Membrane Ultrafiltration for Biogenic Elemental Sulfur Recovery: Performance Optimization and Fouling Analysis"],"prefix":"10.1002","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4992-2949","authenticated-orcid":false,"given":"Jos\u00e9","family":"Su\u00e1rez","sequence":"first","affiliation":[{"name":"Civil Engineering Department Universidad de Concepci\u00f3n  Concepci\u00f3n 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