Toepassing van luchtbehandelingstechnieken binnen de intensieve veehouderij: Fase 2 : mogelijkheden tot kostenverlaging van wassers

Pig and poultry houses are responsible for a large emission of ammonia. Ammonia emission can be reduced by scrubbers systems such as acid scrubbers and biotrickling filters. Currently, air treatment systems are dimensioned on basis of the maximum ventilation capacity of an animal house, which means the scrubber is underloaded for most of the time. Therefore it is suggested to decrease the volume of a scrubber and construct a bypass system that bypasses part of the untreated air to the atmosphere if at times the total air flow is higher than the design air flow of the scrubber. Experimental data and a year-round model for the ammonia emission and air flow of an animal house are presented. Assuming that the ammonia removal efficiency of a scrubber is not affected, calculations show that a bypass system, in which the air treatment capacity is reduced by 70-80% for growing-finishing pigs and 80-85% for broilers, still meets Dutch emission standards. Exploitation costs will probably decrease by 40-70%. As the use of a bypass system increases the average air load and ammonia load of a scrubber; additional measurements are necessary to find out to if and to what extent the ammonia removal efficiency is affected