Influence of different ventilation systems on inhalable and respirable dust particles concentrations distribution in weaning and finishing fattening pig houses. [A shortened version of a PhD. thesis]
2003
Topisirovic, G. (Faculty of Agriculture, Belgrade - Zemun (Serbia and Montenegro))
The application of different mechanical extraction ventilation systems in reducing and controlling dust concentrations in weaning and finishing pig houses was analyzed and discussed in this work. Dust concentrations and airflow velocities have been measured at 20 measuring points, smoothly positioned over the house cross section, in the net consisting of 4 horizontal and 5 vertical rows. The lowest horizontal row was positioned at the pigs breathing zone (40 cm above the floor), and the highest (fourth) horizontal row was positioned at the workers breathing zone (160 cm). Control values were measured in houses with closed doors and windows and all the fans switched off. These values were compared with three experimental sets of values achieved with: floor, roof and both ventilation systems. Dust concentrations were measured by konimeter (Konimeter 10, Karl Zeiss, Jena), airflow velocity in ventilation ducts with a turbine anemometer and the airflow velocity at measuring points with hot wire anemometer. In the finishing house significant decrement of inhalable (F=44.35, P 0.01) and respirable (F
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