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The main aim of this study was to study the biofiltration of foul air at high velocities (or low empty bed retention time, EBRT) as an option to reduce the surface area requirement of the deodorization process. To do so, a pilot-scale biofilter was built and operated with foul air coming from the headworks of a WWTP located at Cannes (France) at velocities ranged from 500 to 1400 m\/h equivalent to 10\u20134 s of EBRT, respectively. The concentrations of pollutants ranged from 0 to 140.75 mg\/m3 H2S and from 0 to 21.5 mg\/m3 NH3. Overall, the removal efficiency was between 87.5 and 98.9% for H2S, and for NH3 removal was between 51.0 and 96.9%. Odor analyses showed average removal efficiencies above 80%. The impact of high air velocity over the pressure drops was also studied.<\/jats:p>","DOI":"10.2166\/wst.2025.100","type":"journal-article","created":{"date-parts":[[2025,7,15]],"date-time":"2025-07-15T13:31:36Z","timestamp":1752586296000},"page":"220-234","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":1,"title":["Odor removal via high-speed biofiltration in headwork operations of wastewater treatment plants"],"prefix":"10.2166","volume":"92","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1517-9918","authenticated-orcid":false,"given":"Manuel Alejandro","family":"Hernandez-Shek","sequence":"first","affiliation":[{"name":"1 SUEZ Engineering & Construction, 4 Place de la Pyramide, 92800 Puteaux, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catherine","family":"Gracian","sequence":"additional","affiliation":[{"name":"1 SUEZ Engineering & Construction, 4 Place de la Pyramide, 92800 Puteaux, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valerie","family":"Nastasi","sequence":"additional","affiliation":[{"name":"1 SUEZ Engineering & Construction, 4 Place de la Pyramide, 92800 Puteaux, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"945","published-online":{"date-parts":[[2025,7,14]]},"reference":[{"key":"key-10.2166\/wst.2025.100-1","doi-asserted-by":"publisher","DOI":"10.3303\/CET1440038"},{"key":"key-10.2166\/wst.2025.100-2","doi-asserted-by":"publisher","DOI":"10.3390\/atmos12020206"},{"key":"key-10.2166\/wst.2025.100-3","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemosphere.2021.130333"},{"key":"key-10.2166\/wst.2025.100-4","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemosphere.2021.132723"},{"key":"key-10.2166\/wst.2025.100-5","doi-asserted-by":"publisher","DOI":"10.1016\/j.procbio.2010.09.007"},{"key":"key-10.2166\/wst.2025.100-6","doi-asserted-by":"publisher","DOI":"10.1016\/j.bej.2019.02.003"},{"key":"key-10.2166\/wst.2025.100-7","doi-asserted-by":"publisher","DOI":"10.2175\/106143003X141240"},{"key":"key-10.2166\/wst.2025.100-8","volume-title":"Biofiltration for air Pollution Control","author":"Devinny","year":"1999"},{"key":"key-10.2166\/wst.2025.100-9","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhazmat.2010.04.093"},{"key":"key-10.2166\/wst.2025.100-10","doi-asserted-by":"publisher","DOI":"10.1016\/j.jece.2017.05.022"},{"key":"key-10.2166\/wst.2025.100-11","first-page":"12","article-title":"Biofiltration process as an ideal approach to remove pollutants from polluted air","volume":"99","author":"Fulazzaky","year":"2013","journal-title":"Paper Knowledge. 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