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Industry Partners
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:
PHYTOREMEDIATION OF FLUORINATED AGROCHEMICALS BY DUCKWEED
Posted in: Environment by admin on January 1, 2006 | No Comments
Bias of Tedlar Bags in the Measurement of Agricultural Odorants
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A Simple DSA Method to Detect Air Contamination During CO2 Venous Studies
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Size Reduction of Ammonia Scrubbers for Pig and Poultry Houses: Use of Conditional Bypass Vent at High Air Loading Rates
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In The Netherlands, both acid and biological air scrubbers are used for removal of ammonia from exhaust air at pig and poultry houses. Current regulations require that scrubbers are dimensioned for treating the maximum airflow rate that may occur, so on average these systems are overdimensioned and underloaded. A new approach is introduced that is based on bypassing airflow peaks untreated. As a result, the air loading rate in m3 [air] m3 [scrubber] h1 and ammonia loading rate in kg [NH3] m3 [scrubber] h1 of the scrubber are more constant in time and average loading rates increase. By model calculations and analyses of measurement datasets it was demonstrated that the application of such a scrubber significantly decreases the required scrubber size while ammonia emission levels are only slightly increased (e.g. where the bypass is operated at 50% of the maximum ventilation rate and the scrubber volume is reduced by 50%, the bypass venting systems only allows 10–20% of the total ammonia load to be vented untreated). As a result, both the efficiency of scrubber utilisation in kg [NH3 removal] m3 [scrubber volume] and the cost-effectiveness of air scrubbing for ammonia removal in kg [NH3 removal] h1 are increased.
Technical and economical evaluation of direct in-barn solid-liquid separation of pig slurry and its environmental impacts
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One of the major goals of Québec’s Règlement sur les exploitations agricoles, REA is to prevent excessive soil enrichment of phosphorous. When used as the only nitrogen fertilizer to meet the soil requirements, pig slurry brings too much phosphorous to the soil. Complete manure treatment systems prevent this problem, but are expensive and require solid-liquid separation of the slurry. On the other hand, in-barn separation of pigs’ feces –below the slatted floor – produces a solid fraction high in phosphorous and dry matter content, and could reduce odours and greenhouse-effect gases. Three in-barn feces separation systems with regards to separation efficiency and air quality: the net, the V-shaped scraper and the conveyor belt have been compared. All three systems had a similar separation efficiency, concentrating more than 90% of phosphorous and around 50% of nitrogen within the solid fraction, which always contained a minimum of 30% dry matter. All systems equally reduced ammonia (NH3) by 50%, like the conventional scraper. Hence, the sole regular removal of feces from under the pigs seems as efficient as solid-liquid separation to lower NH3 emissions. Greenhouse gases (N2O and CH4), odour emission and the hedonic parameters were not modified significantly by the three systems.
In the field, spreading of the liquid fraction requires from 6,7 to 7,7 times less growing area. The installation of such systems would cost 66$ more per pig-place than the conventional system, but design optimization can reduce the costs.
FEASIBILITY OF HYDROGEN PRODUCTION FROM ANAEROBIC MIXED FERMENTATION
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