Strohmaier, Johanna Carolina Luise: Exhaust air treatment systems for the mitigation of dust, ammonia and odour from poultry housing. - Bonn, 2020. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
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author = {{Johanna Carolina Luise Strohmaier}},
title = {Exhaust air treatment systems for the mitigation of dust, ammonia and odour from poultry housing},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2020,
month = nov,

note = {Exhaust air treatment is becoming increasingly important in poultry husbandry with a rising number of animals kept per barn. An adaptation of the systems that already have been successfully used in pig husbandry only works out to a limited extent due to other initial parameters in poultry husbandry, which is why specific adjustments need to be carried out. In the present dissertation, different filter components in different housing systems were examined regarding their suitability.
In the first study a dry filter for dust reduction is tested. Comparative investigations under laboratory conditions in a wind tunnel and in a laying hen barn are carried out. Depending on the particle size fraction, separation efficiencies between 60 and 79% are measured in the wind tunnel. In the barn, the reduction efficiency is lower, which can, inter alia, be explained by the fact that the exhaust air is exposed to considerable turbulences there.
The second study deals with a two-stage exhaust air treatment system at a broiler fattening facility. The first stage consists of a chemo-scrubber, the second stage of a biofilter. The biofilter is divided into two halves: one is equipped with root wood, the other one with honeycombed paper pads. Besides the reduction of ammonia from the exhaust air, the focus is especially on the odour reduction efficiency of the biofilter and the suitability of the two filter materials used. Both filter halves are able to reduce the odour load, but the honeycombed paper pads with a reduction of 51% are more effective than the root wood with 38%. The latter also proves to be susceptible to fungal growth, which could have a negative effect on long-term stability and secondary emissions.
The third study in the form of a conference paper illustrates an investigation of a three-stage exhaust air treatment system for cleaning the exhaust air of a laying hen house. The dry filter already used in study 1 forms the first stage, followed by a chemo-scrubber and a biofilter. The honeycombed paper pads used in study 2 are also used as filling material for this biofilter. An odour reduction of 68.4 % is achieved here. The dust reduction performance in the multi-stage system is also significantly higher compared to the single-stage system.},

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