By A.J. Dragt, J. van Ham

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Extra resources for Biotechniques for air pollution abatement and odour control policies: proceedings of an international symposium, Maastricht, the Netherlands, 27-29 October, 1991

Example text

2-dichloroethane the formation of a network of long films and filaments between the packing elements was observed. However, the biofilms of HypAomicmbium in the degradation of dichloromethane were characterized by an aggregation of small flocs. It may thus be concluded that also the morphology of a biofilm may strongly determine the succesful application of the trickling filter. The number of full-scalb applications of a biological trickling filter for the purification of waste gases is very limited as far as the authors know.

0 m, while the initial gas loads applied amounted to 5-10 m1/m2 h [19]. Fairly long residence times(up to several minutes) were needed in order to achieve a high removal 23 PURE COUPOST (60%) Y 0 a 2 1, /' 2500 2000 /' COMPOST-POLYSTYRENE , m w a , COMPOST-BARK , (40:,, ,-\, 1 __-___--____---- 500 0 advantageously be humidified. As 100% saturation can hardly be achieved, an additional (periodical) water supply to the filter at the top of the filterbed may sometimes be necessary. As the dry-out process generally starts at the gas inlet side, in those cases the 100 200 300 400 500 S U P E R F I C I A L G A S FLOW R A T E [m/h]' Fig.

1990) 36 3. Abbau von Problemsubstamen Wie schon oben an efiihrt, werden sehr viele Verbindungen in Biofiltern, Biowkc ern oder durch andere biolo ische Reinigungsverfahren mit hoher Effizienz abgebaut [4]. Dies beru t auf dem giinstigen Umstand, d d alle diese Substanzen biolo isch mehr oder weniger gut abbaubar sind und somit von den a bauenden Mikroorganismen als Nahrungs- und Energiequelle genutzt werden konnen. i % a Anders verhilt es sich mit Stoffen oder Stoff emischen, die biologisch schwer abbaubar sind.

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