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Research r...Environmen...New Standards for Odour Emissions from Pig Facilities in Denmark

New Standards for Odour Emissions from Pig Facilities in Denmark

The aim of this study was to determine the average odour emission from the most common pig facilities in Denmark during the summer in order to find new standards for odour emissions.

Abstract

The summer period was selected as odour emissions from finishing pigs was found to be highest during this period and is of great concern during public administration in the regulation of air pollutants.

To determine the odour emission from the nine most common categories of pig facilities in Denmark, 216 odour samples were collected. The nine categories of pig facilities were: dry sows kept in individual crates with partially slatted floors, dry sows kept loose, lactating sows kept in individual crates with partially or fully slatted floor, respectively, weaners kept in pens with partially or fully slatted floor, respectively, and finishers kept in pens with partially slatted, fully slatted or drained floor, respectively. Each category was represented by four intensive pig units, which all were mechanically ventilated. Odour samples were collected from each unit on three days with two samples per day. The samples were collected from the exhaust ventilation air in Tedlar® bags, and odour concentration was determined by an accredited odour laboratory. The ventilation rate of each house type was measured by a Fancom measuring fan.

The odour emission from dry sows did not differ significantly between the types of facility. This was also observed for weaners and therefore one number for odour emission is given for each of these stages of production. No difference was found between fully slatted floor and drained floor in finisher facilities. The odour emissions given in OUEs÷1 animal÷1 were 16 for dry sows, 72 for lactating sows with partially slatted floor, 100 for lactating sows with fully slatted floor, 7 for weaners, 19 for finishers with partially slatted floor and 29 for finishers with fully slatted or drained floor.

Furthermore, the ammonia concentration was measured in the exhaust ventilation air by Kitagawa Gas Detector Tubes at each odour sample. The ammonia emissions were 10.9, 13.4, 25.3, 0.1, 1.7, 4.6 and 6.2 g d÷1 animal÷1 for dry sows, lactating sows with partially slatted floor, lactating sows with fully slatted floor, weaners with partially slatted floor, weaners with fully slatted floor, finishers with partially slatted floor and finishers with fully slatted or drained floor.

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Author

Anders Leegaard Riis

Senior Project Manager 

Tlf.: +45 3339 4385

E-mail: anr@lf.dk

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