By-passing acidification limitations during the biofiltration of high formaldehyde loads via the application of ozone pulses
•Ozone addition permits to treat higher formaldehyde loads than ever reported.•Ozone addition acts as an indirect in situ pH regulator, minimizing the accumulation of acid byproducts.•Mineralization of formaldehyde occurs, which has never been reported.•Low ozone levels have no negative effects on b...
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Veröffentlicht in: | Journal of hazardous materials 2013-11, Vol.262, p.732-740 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Online-Zugang: | Volltext |
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Zusammenfassung: | •Ozone addition permits to treat higher formaldehyde loads than ever reported.•Ozone addition acts as an indirect in situ pH regulator, minimizing the accumulation of acid byproducts.•Mineralization of formaldehyde occurs, which has never been reported.•Low ozone levels have no negative effects on biological degradation activity.•The use of hybrid processes allows overcoming biofiltration limitations.
A formaldehyde airstream was treated in a biofilter for an extended period of time. During the first 133 days, the reactor was operated without ozone, whereas over the following 82 days ozone was intermittently implemented. The maximum stable elimination capacity obtained without ozone was around 57gm−3h−1. A greater load could not be treated under these conditions, and no significant formaldehyde removal was maintained for inlet loads greater than 65gm−3h−1; the activity of microorganisms was then inhibited by the presence of acidic byproducts, and the media acidified (pH |
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ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2013.09.053 |