{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,8]],"date-time":"2026-05-08T05:46:10Z","timestamp":1778219170050,"version":"3.51.4"},"reference-count":22,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2005,4,5]],"date-time":"2005-04-05T00:00:00Z","timestamp":1112659200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biotech &amp; Bioengineering"],"published-print":{"date-parts":[[2005,5,20]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>An integrated physicochemical and biological technique for NO<jats:sub>x<\/jats:sub> removal from flue gas, the so\u2010called BioDeNO<jats:sub>x<\/jats:sub> process, combines the principles of wet absorption of NO in an aqueous Fe(II)EDTA<jats:sup>2\u2212<\/jats:sup> solution with biological reduction of the sorbed NO in a bioreactor. The biological reduction of NO to di\u2010nitrogen gas (N<jats:sub>2<\/jats:sub>) takes place under thermophilic conditions (55\u00b0C). This study demonstrates the technical feasibility of this BioDeNO<jats:sub>x<\/jats:sub> concept in a bench\u2010scale installation with a continuous flue gas flow of 650 l.h<jats:sup>\u22121<\/jats:sup> (70\u2013500 ppm NO; 0.8\u20133.3% O<jats:sub>2<\/jats:sub>). Stable NO removal with an efficiency of at least 70% was obtained in case the artificial flue gas contained 300 ppm NO and 1% O<jats:sub>2<\/jats:sub> when the bioreactor was inoculated with a denitrifying sludge. An increase of the O<jats:sub>2<\/jats:sub> concentration of only 0.3% resulted in a rapid elevation of the redox potential (ORP) in the bioreactor, accompanied by a drastic decline of the NO removal efficiency. This was not due to a limitation or inhibition of the NO reduction, but to a limited biological iron reduction capacity. The latter leads to a depletion of the NO absorption capacity of the scrubber liquor, and thus to a poor NO removal efficiency. Bio\u2010augmentation of the reactor mixed liquor with an anaerobic granular sludge with a high Fe(III) reduction capacity successfully improved the bioreactor efficiency and enabled to treat a flue gas containing at least 3.3% O<jats:sub>2<\/jats:sub> and 500 ppm NO with an NO removal efficiency of over 80%. The ORP in the bioreactor was found to be a proper parameter for the control of the ethanol supply, needed as electron donor for the biological regeneration process. The NO removal efficiency as well as the Fe(III)EDTA<jats:sup>\u2212<\/jats:sup> reduction rate were found to decline at ORP values higher than \u2013140 mV (pH 7.0). For stable BioDeNO<jats:sub>x<\/jats:sub> operation, the supply of electron donor (ethanol) can be used to control the ORP below that critical value. \u00a9 2005 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/bit.20420","type":"journal-article","created":{"date-parts":[[2005,4,6]],"date-time":"2005-04-06T09:30:44Z","timestamp":1112779844000},"page":"433-441","source":"Crossref","is-referenced-by-count":48,"title":["NO<sub>x<\/sub> removal from flue gas by an integrated physicochemical absorption and biological denitrification process"],"prefix":"10.1002","volume":"90","author":[{"given":"Peter","family":"van der Maas","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pim","family":"van den Bosch","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bram","family":"Klapwijk","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Piet","family":"Lens","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,4,5]]},"reference":[{"key":"e_1_2_1_2_1","unstructured":"Akzo Nobel.1996.Determination of iron (II) in iron\u2010aminocarboxylates. 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