Environment

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Prairie Swine Centre is an affiliate of the University of Saskatchewan


Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.

Financial support for the Enterprise Model Project and Pork Insight has been provided by:



Author(s): Al-Kanani, T.(1), E. Akochi (2), A.F. Mackenzie (3), I. Alli (2), and S. Barrington(4).
Publication Date: January 1, 1992
Reference: Journal of Environmental Quality, 21: 704-708 (1992).
Country: Canada

Summary:

Laboratory studies were done to evaluate the capacity of different amendments and aeration added to liquid hog manure(LHM) to reduce the emission of malodorous gases. The amendments, sphagnum peat moss (80% dry matter) in proportion of 1%, 4% and 8%, monocalcium phosphate monohydrate (reagent grade) (4% addition), H2SO4 (1.5 M), H3PO4 (1.7M), CaCO3 (2% and 2% + sphagnum peat moss 1%), CaO (2%) and elemental S (4%), were surface applied to manure and mixed by intermittent brief aeration. Aeration and nonaeration were also define as treatments for the 1 kg LHM samples placed in 2.7 L jars which incubated for 720 h at 23 C. Gas samples were taken from the jars at 2, 4, 24, 96 and 720 h after the beginning of the experiments and presented to volunteer untrained panelists for sensory evaluation rating the odour presence and offensiveness on a numerical scale of 0 to 10. Gas samples were also taken for gas chromatography and mass spectroscopy analysis. The results showed that aeration markedly reduced the odor. As this process is expensive, considerations should be made on treatments under nonaerated conditions. The effectiveness of these treatments still have to be evaluated on scale applications however some combination of sphagnum peat moss and CaCO3 should be further investigated in field applications as these are the treatment giving the most interesting results.

Important differences could be obtained in a large scale application. This experiments leave unanswered questions has to the apparatus necessary to achieve those treatments in a large scale and particularly the economics of such treatments. The method uses to evaluate the odor only qualify the odor intensity and cannot be compared to the olfactometric method more commonly used.

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