Packing material
Polyurethane foam (PUF) cubes of 1 cm3
were used as filter packed bed. This packing
material has a surface area of approximately 600 m2
/m3
and a density of 20 kg/m3
(Devinny et al., 1999). It is an inert material with low density, large porosity (near
96%), good scaling-up possibilities and very low commercial cost (McNevina et al.,
2000; Moe et al., 2000). Low density provides advantage in construction and minimizes
problems of compaction of packing material. High porosity permits uniform gas flow
distribution needed for maximum contact between the gas stream and biofilm biomass.
The total weigh of PUF in the biofilter was 10 grams.