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Chemical Treatment for Odor Abatement Measured Organoleptically in Liquid Dairy Manure¹

Department of Dairy Science, Michigan State University, East Lansing 48824

ABSTRACT

Lime, paraformaldehyde, hydrogen peroxide, and potassium permanganate were evaluated for their efficacy in controlling odor produced from decomposed liquid manure (5.6% dry matter). Paraformaldehyde reduced total aerobic microbial numbers and ammonia in treated manure, indicating a reduction in decomposition. In odor evaluation, allowing panelists to rate each treatment for degree of offensiveness olfactory fatigue was a significant problem for large numbers of treatments. In a second experiment to alleviate this problem, each panelist was allowed to evaluate only three jars at one time. The three jars, one always a control, were ranked by their relative offensiveness. Hydrogen peroxide at 100 and 500 ppm consistently reduced offensiveness rankings from .5 to 1.5 h after addition, but reduction was nil at day 9. On the other hand, 500 ppm potassium permanganate was consistently effective longer (8 and 9 days). This technique of odor evaluation reduced olfactory fatigue and allowed detection of subtle differences between treatments.

¹ Published with the approval of the Director of the Experiment Station as Journal Article No. 8225.

² Partially Supported by Grant GMO 1818.

³ Ralston Purina Co., Dairy Research Division, St. Louis, MO 63188.