Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 520676
Title Biofiltration of exhaust air from animal houses: removal efficiencies and practical experiences
Author(s) Melse, R.W.; Hol, J.M.G.
Event CIGR 18th World Congress 2014, 2014-09-16/2014-09-19
Department(s) LR - Veehouderij en omgeving
Publication type Contribution in proceedings
Publication year 2014
Abstract Two wood-chip biofilters (capacity and surface area for biofilter #1: 75.000 m3/hour from poultry manure dryer, 68 m2; biofilter #2: 100,000 m3/hour from fattening pig house, 188 m2; media depth: 25 cm) were monitored during 6 - 10 months. Average ammonia (NH3) and odour removal efficiencies were 42 - 62%. NH3 outlet concentrations appeared rather constant and independent of fluctuations in inlet concentrations, so higher inlet concentrations led to higher calculated removal efficiencies. Part of the inlet NH3 was converted to nitrous oxide (N2O). The average N2O production was equal for both biofilters (0.5 g N2O/m2/hour) although NH3 loading rates were very different (30 and 2.4 g NH3/hour). Average air loading rates were 657 and 341 m3/m2/hour, which equal air residence times of 1.4 s and 2.6 s; average pressure drops were 287 and 22 Pa. It is concluded that biofilters have potential for emission reduction at animal houses, but it is recommended that they are professionally designed, operated, and monitored. Especially high pressure drop (clogging/fouling) and homogenous moistening of the biobed need attention.
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