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The Effectiveness of Various Biofiltration Substrates in Removing Bacteria, Endotoxins, and Dust from Ventilation System Exhaust from a Chicken Hatchery

Department of Animal Hygiene and Environment, Faculty of Biology and Animal Breeding, University of Agriculture in Lublin, 20–950 Lublin, Poland

¹ Corresponding author: leszek.tymczyna{at}ar.lublin.pl

The objective of this study was to evaluate the effectiveness of various organic and organic-mineral biofilter media in purifying ventilation exhaust from a chicken hatchery room. Three different substrates were tested. Efficiency levels for the removal of dust, gram-negative bacteria, and bacterial endotoxin were recorded. The microbiological properties of the substrates were also studied. All of the biofilter substrates were highly effective in removing gram-negative bacteria, moderately effective in reducing dust levels, and only slightly effective in removing endotoxin. The substrate that was most efficient in retaining bioaerosols was the organic-mineral medium containing 20% halloysite, 40% compost, and 40% peat, which generally had at least satisfactory efficiency values for removing all of the contaminants tested.

Key Words: biofiltration • endotoxin • gram-negative bacteria • dust • chicken hatchery