Ammonia causes odor problems at livestock farms
Ammonia, which is one of malodorous substances, is released into the air mainly from the livestock industry in Japan. Actually, 60% of the total ammonia was released from the livestock industry in the fiscal year 1994 (A. Kannari et. al. J. Jpn. Soc. Atoms. Environ. 36, 29 - 38, 2001). The livestock industry requires the removal of ammonia from the perspective of preventing malodors in the surrounding area. To date, biological methods, e.g. biofilters and soil filter, are being used in some livestock facilities for this purpose. With these biological methods, large-size equipment is required owing to the large amount of ammonia. Therefore, more compact equipment was demanded in the livestock industry. In addition, removing malodorous substances from the atmosphere inside piggery is expected to improve the pig production efficiency.