Reduction of ammonia and odor emissions from a piggery with biofilters

摘要

Long-term measurements were carried out in parallel on two biofilters under practical conditions to test their reduction potential for ammonia and odor emissions. The average efficiency of the ammonia reduction calculated for the first measuring period (6.5-year-old filterbed material) was about 15 at biofilter 1 and 36 at biofilter 2. The average efficiency of the odor reduction calculated for the first measuring period was about 78 at biofilter 1 and 80 at biofilter 2. The efficiency of ammonia reduction was mainly influenced by the airflow rate. The odor reduction was mainly influenced by the odor concentration before the filterbed. The cleaning efficiency of the biofilters could be improved by increasing the moisture content of the filterbed material from 20 to 40, or from 20 to 50.