{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T10:11:07Z","timestamp":1787739067946,"version":"build-2784847793"},"reference-count":48,"publisher":"IWA Publishing","issue":"7","license":[{"start":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T00:00:00Z","timestamp":1774569600000},"content-version":"vor","delay-in-days":17,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/100018693","name":"HORIZON EUROPE Framework Programme","doi-asserted-by":"publisher","award":["101058426"],"award-info":[{"award-number":["101058426"]}],"id":[{"id":"10.13039\/100018693","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["iwaponline.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,4,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Shows an overview of the integrated biogas purification and nutrient recovery system. The diagram illustrates the coupling of a two-stage biological desulfurization unit with a hollow-fiber membrane contactor. Biogas containing H\u2082S enters the first scrubber, is oxidized to H\u2082SO\u2084, and the biologically produced acid reacts with NH\u2083 recovered from the effluent to form ammonium sulfate ((NH\u2084)\u2082SO\u2084), demonstrating simultaneous gas purification and nutrient recovery.<\/jats:p>\n                  <jats:p>This study presents a novel integrated system for biogas purification and nutrient recovery, combining biological desulfurization with ammonia recovery using a hollow-fiber membrane contactor. Designed for anaerobic treatment of nitrogen- and sulfur-rich wastes, the system enables simultaneous hydrogen sulfide (H2S) removal and ammonium sulfate production, improving environmental performance and resource recovery. A two-stage desulfurization unit scrubbed and biologically oxidized H2S to sulfuric acid under controlled oxygen supply. The acid was neutralized by ammonia extracted from the biogas effluent through a hydrophobic membrane, forming ammonium sulfate without chemical additives. The system achieved over 95% H2S removal, with outlet concentrations below 35 ppm, and accumulated up to 12.5 g\/L (0.095 mol\/L) ammonium sulfate. Operation remained stable over several months at pH 3.0, with mass balance and ion analyses confirming efficient sulfur conversion. Microbial analysis identified Acidithiobacillus and Alicyclobacillus as dominant sulfur oxidizers. Compared with conventional systems, the two-stage design avoided sulfur clogging and biogas dilution. This robust, scalable process couples gas purification with nutrient recovery, producing a concentrated fertilizer solution while minimizing chemical use and supporting circular resource utilization.<\/jats:p>","DOI":"10.2166\/wst.2026.241","type":"journal-article","created":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T08:53:38Z","timestamp":1774601618000},"page":"953-967","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":1,"title":["Integrated biogas desulfurization and membrane extraction for ammonium sulfate recovery"],"prefix":"10.2166","volume":"93","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5648-3097","authenticated-orcid":false,"given":"Werner","family":"Fuchs","sequence":"first","affiliation":[{"name":"a BOKU University, Institute of Environmental Biotechnology, Department of Agricultural Sciences, Institute of Environmental Biotechnology, Konrad-Lorenz-Strasse 20, Tulln an der Donau 3430, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0937-9769","authenticated-orcid":false,"given":"Ferdinand","family":"Hummel","sequence":"additional","affiliation":[{"name":"a BOKU University, Institute of Environmental Biotechnology, Department of Agricultural Sciences, Institute of Environmental Biotechnology, Konrad-Lorenz-Strasse 20, Tulln an der Donau 3430, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paula","family":"Garcia Sarzosa","sequence":"additional","affiliation":[{"name":"a BOKU University, Institute of Environmental Biotechnology, Department of Agricultural Sciences, Institute of Environmental Biotechnology, Konrad-Lorenz-Strasse 20, Tulln an der Donau 3430, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3458-8362","authenticated-orcid":false,"given":"Lisa","family":"Bauer","sequence":"additional","affiliation":[{"name":"b BEST-Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, Graz 8010, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1136-2010","authenticated-orcid":false,"given":"Wolfgang","family":"Gabauer","sequence":"additional","affiliation":[{"name":"a BOKU University, Institute of Environmental Biotechnology, Department of Agricultural Sciences, Institute of Environmental Biotechnology, Konrad-Lorenz-Strasse 20, Tulln an der Donau 3430, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"945","published-online":{"date-parts":[[2026,3,10]]},"reference":[{"key":"key-10.2166\/wst.2026.241-1","volume-title":"Biogases Towards 2040 and Beyond","author":"Alberici","year":"2024"},{"key":"key-10.2166\/wst.2026.241-2","doi-asserted-by":"publisher","DOI":"10.1016\/j.envres.2022.114432"},{"issue":"5","key":"key-10.2166\/wst.2026.241-3","first-page":"835","article-title":"Inhibition of nitrification by ammonia and nitrous acid","volume":"48","author":"Anthonisen","year":"1976","journal-title":"Journal of the Water Pollution Control Federation"},{"key":"key-10.2166\/wst.2026.241-4","doi-asserted-by":"publisher","DOI":"10.2166\/wpt.2022.072"},{"key":"key-10.2166\/wst.2026.241-5","doi-asserted-by":"publisher","DOI":"10.21307\/acee-2016-011"},{"key":"key-10.2166\/wst.2026.241-6","doi-asserted-by":"publisher","DOI":"10.3390\/fib6040076"},{"key":"key-10.2166\/wst.2026.241-7","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2020.114616"},{"key":"key-10.2166\/wst.2026.241-8","unstructured":"BMUKN German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (2021) Berlin, Germany. 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