Previous studies(Wang, 1998) have shown a strong correlation between odor and dust levels. In this study a wet pad scrubber was installed in a tunnel ventilated swine finishing building in order to view the removal of dust and odors from airflow. The wetpad scrubber (washing wall system) was installed 4ft infront of the exhaust fans so all ventilation airflow passes through the system. Dust and ammonia levels were measured at the air inlet, upwind of the scrubber and downwind of the pad at low and high ventilation rates.

The scrubber did not initiate a static pressure drop, however was not very effective in evaporating water. Dust removal was very effective at low ventilation rates, reducing dust levels up to 65%, however dust levels were only reduced by 20% at ventilation rates typical of hot weather. Ammonia levels realized a small reduction of 6.7% at the low ventilation rate, but no difference was reported at the high ventilation rate. Except for the smallest particles, particles numbers were less after passing through the scrubber than after it. A chemical analysis of dust particles indictaed pehnols and mercaptans were absobed by dust particles wimilar to that of other studies. Phenol levels in the dust were not significantly different before and after the scrubber, however since duts levels were reduced total amount of phenols on the dust was reduced. At high ventilation rates consistent with hot weather, odour was reduced betwenn 13-17%. Results from this tsudy strongly suggest that odours emitted from swine buildings are strongly linked to dust, therefore odour intensity reduction are similar to dust reductions.