Dernière mise à jour le : 20 juillet 2014

NH3 biofiltration of piggery air


An aboveground pilot-scale biofilter filled with wood chips was tested to treat ammonia emissions from a piggery located in Brittany (France). Two long-term tests (“summer” and “autumn” experiments) were carried out to improve biofilter applications for agriculture. The influence of climatic conditions on biofilter performance was taken into account. During summer 2012, the biofilter was operated for 74 days at different empty bed residence times (EBRTs) from 6 to 15 s. Inlet NH3 concentrations were relatively constant (around 15 mg m?3). Significant NH3 reductions were achieved at EBRT = 12 s (removal efficiencies, RE, ranged between 90 and 100% for loading rates, LR, of around 4 g m?3 h?1). At a lower EBRT (6 s), RE dropped to roughly 30–50%. This was due to the dramatic increase in the loading rate (LR up to 12 g m?3 h?1) but the results showed that the change in atmospheric conditions (temperature and relative humidity) also had a significant influence on biofilter performance. It was evidenced that the use of a humidifier upstream of the biofilter must be taken into account for large-scale biofilter design, but only for specific conditions (the spraying of the biofilter having to be carried out exceptionally). During autumn 2012, the biofilter was operated for 116 days at EBRT = 12 s. RE were around 80% for LR of around 3 g m?3 h?1. In such autumnal atmospheric conditions, a demister system should be installed upstream of the biofilter in order to avoid water accumulation in the bed material. Although biofiltration was suitable for NH3 treatment of piggery air, the need to control accurately the medium moisture content implies that biofilters would not be easily managed by a pig farmer.


keyboard_arrow_right Titre : NH3 biofiltration of piggery air
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Andrès Y., Landrain B., Landrain P., Dumont E., Hamon L., Lagadec S.
keyboard_arrow_right Date de publication : 20 juillet 2014
keyboard_arrow_right Editeur(s) : Elsevier
keyboard_arrow_right Tags thématiques : pollution de l'air, élevage, pollution du sol, pollution de l'eau
keyboard_arrow_right Mots-clés libres : Biofiltration/EBRT/Moisture/NH3/Piggery
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1016/j.jenvman.2014.03.008
keyboard_arrow_right Collection : Journal of environmental management

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