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Efficacy of Certain Chemical and Biological Compounds for Control of Odor from Anaerobic Liquid Swine Manure^{1, 2,}

The Pennsylvania State University, University Park 16802

Abstract

The effectiveness of various chemical and biological compounds in controlling the odors of anaerobically stored liquid manure was measured. The criteria for acceptable odor control were consistently concurrent reductions in odor panel ratings and sulfide concentrations. Investigations of prospective odor control materials were carried out on two levels: (1) short term, which examined oxidants and an adsorbent for odor control effectiveness during 24 hr or less, and (2) long term, which examined available proprietary compounds which might exert odor control over a period of months.

Short term experiments indicated that H₂O₂, NaOCl, ClO₂ and KMnO₄, at 500 mg/1 dosage or greater, reduced sulfide (S⁼) and odor to acceptable level in liquid swine waste. However, activated carbon at 2,000 or 5,000 mg/1 dosage did not reduce odors to acceptable levels.

Long term experiments showed that dried enzymes, dried bacteria, orthodichlorobenzene containing materials and lime, were not effective in reducing the odor or S⁼ levels of swine waste. NH₄NO₃ and NaNO₃ were found to change the character of odor, reduce S⁼ level and cause suspended solids to float.

¹ The authors wish to acknowledge the financial support provided for this research by a NSF Research Initiation Grant, E. I. DuPont DeNemours and Company, and Agway Inc. and numerous vendors who supplied chemicals or proprietory compounds. This project was sponsored (in part) with funds received from The Pennsylvania Fair Fund, administered by the Pennsylvania Department of Agriculture.

² Authorized for publication as Paper No. 4811 in the Journal Series of the Pennsylvania Agricultural Experiment Station. Authorized February 11, 1975.

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