Bioscrubbers technology has been discussed in the last few years for odour emissions reduction for animal buildings. This present project aims at the determination of ammonia and odour reduction efficiency of 3 different types of bioscrubbers (different by their dimensions) used on pig farms. The major factors influencing the performance of the bioscrubbers in reducing odours and ammonia were determined and the cost associated with biofilters were evaluated. Bioscrubbers have proven to be effective in odour reduction (reduction ranging from 61 to 89%). However they are unsuitable for ammonia emission reduction from farms, the ammonia emissions are not treated in a satisfactory way as ammonia emission can be done in a more effective and cheaper way. The costs of the bioscrubbers range from 9 U.S.$ to 17 U.S.$ per fattening pigs.

This technique is interesting for odour reduction but in a near future, as it is done in Europe, ammonia emissions will have to be controlled also. The bioscrubbers tested here are not interesting because of its expensive cost. Also as the air is washed by water and sludge flow, treatment of this effluent has also to be done. Improvements in the technology have to be done to make bioscrubbers interesting for on farm applications.