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Separation of Pig Manure Under Slats: to Reduce Releases in the Environment!

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  054159,  2005 ASAE Annual Meeting . (doi: 10.13031/2013.19914) @2005
Authors:   I. Lachance, Jr., S. Godbout, S.P. Lemay, J.-P. Larouche,F. Pouliot
Keywords:   Air quality, ammonia, conveyor belt, feces, manure handling systems, odors, scraper, net, separation, urine

Literature has shown separating urine from feces and frequently removing both fractions is suitable for diminishing gas and odor emissions from building. On average, under-slat separation systems in piggeries can reduce ammonia and odor emissions by up to 50%. For the present study, the experimental set-up included 5 treatments, of which 3 separation systems (belt, net, V-shaped scraper). The scraping frequency and the effectiveness of the separation process were evaluated. The experiment took place in 12 identical, completely independent bench-scale rooms with their own manure handling system. Each room housed 4 grower-finisher pigs from 30 to 80 kg for an 8-week period. Results show there is a significant effect of the treatment on NH3 emissions (p=0.02). Without the separation process, removing the manure every 2-3 days significantly reduces NH3 emissions by 46% (52.7 mg day-1 kgpig -1) compared to the control. Within a storage period of 2-3 days, the separation of the urine and feces directly under slats allows a 49% (50.0 mg day-1 kgpig -1) reduction of NH3 emissions compared to the control treatment. The different separation systems have the same NH3 reduction capacity. Results show there is no advantage for separation or removal frequency on CO2 and CH4 emissions, within a week period. For the same period, it is not beneficial to separate excrement and urine directly under slats for reducing odors production in the building. Manure management systems do not have an impact on the hedonic tone.

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