Search

While biofiltration and bioscrubbing have already established themselves as standard methods of volatile organic compound (VOC) and odor control, trickling bed biofilter applications are mainly confined to laboratory studies, with only a few installed systems reported in industrial operation. An example of successful industrial biotrickling filter application, controlling highly variable loads of water soluble VOCs at a flexographic printing facility, is presented. The biotrickling filter operates at 14 s contact time and removes on average 7 kg of mixed water-soluble solvents per hour (280 g per m 3 of carrier per hour). The plant is fully compliant with the EC Council Directive 1999/13/EC on the limitation of emissions of VOCs. The operating costs of a biotrickling filter are discussed.

The face to face interactions of reference librarians and reference assistants are studied from a theoretical practice perspective. Rather than reinforcing professional boundaries, the results of this analysis support reference practice in public libraries as a highly relational activity where reference “expertise” retains a significant subjectivist, relational dimension.Les interventions en personne des bibliothèques de référence et des adjoints à la référence sont étudiées du point de vue de la pratique théorique. Plutôt que de renforcer les frontières interprofessionnelles, les résultats de cette analyse appuient l'idée que les pratiques de référence en milieu public sont des activités hautement relationnelles où l'expertise de la référence conserve une dimension subjectiviste et relationnelle.