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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:
Scenario-based environmental assessment of farming systems: the case of pig production in France
Posted in: Environment by admin on January 1, 2005 | No Comments
Pipeline Design Procedures for Cattle and Pig Slurries using a Large-scale Pipeline Apparatus
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A large-scale pipeline apparatus was built to investigate the turbulent flow properties of farm livestock slurries and to enable the development of a pipeline design procedure. The apparatus was designed to measure pressure gradients of liquid flows from 120 to 700 l/min in pipes of different internal diameters (381, 508, 762 and 102 mm). Results were obtained using water, pig slurries containing total solids concentrations Ts up to 44% and dairy cattle slurries with Ts values up to 55%. Measurements of pressure gradient and flow rate were converted into values of wall shear stress and nominal shear rate to produce characteristic relationships for each liquid in each pipe. Hence, it was shown that a three-parameter pipeline design procedure could provide a suitable basis for predicting pressure losses in pipes of other diameters, including surface roughness effects.
Experimental assessment of the design procedure revealed an intrinsic risk of systematic correlation between two of the three parameters. Hence, an approach was devised to alleviate this problem by reducing the number of parameters to two. It was found that the resulting two parameters could each be represented by a linear function of Ts, enabling convenient prediction of pressure losses for other slurries.
The ecology of emerging neurotropic viruses
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Technico-economical evaluation of the Polymair® heat-recovery air exchanger in a finisher hog unit on bedding and in a piglet nursery
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The energy performance of the Polymair® heat-recovery air exchanger has been evaluated in a finisher hog unit floored with bedding, and in a piglet nursery, in the winter of 2003-2004. Two Polymair® systems were installed in a room containing four pens, each containing around 25 pigs. The two systems delivered maximum flow rates of 0,52m3 and 0,62m3/s. During the first 50 days, only one Polymair® system was enough to ventilate the whole room. Afterwards, the two systems ensured a flow rate of 8-9 liters of air/second/pig, with a relative humidity of 80%. This kept the bedding in good condition, avoiding the need to add new one. The two systems maintained more than acceptable ambient CO2 and NH3 emissions, and an average thermal efficiency of 49%. They allowed annual savings of $1155 on energy (considering $0,35/l of propane) and of $1125 on bedding handling labour, for a total of $2280. The nursery experiment was performed in two nursery units of 160 heads each. One was equipped with a Polymair® system delivering 0,38m3 of air/second and the other, with conventional bottom air extraction. In these two small rooms, air infiltrations made the ventilation only operate in case of excessive heat. This prevented the searchers from observing the expected 60 to 70% energy savings. When installing such a system, preventing air infiltration is vital, starting with the installation of nonreturn valves in its cold and warm air ducts, and of a humidity probe triggering device.
HEAT TRANSFER MODEL FOR PLUG-FLOW ANAEROBIC DIGESTERS
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Recovery of phosphorous from swine wastewater through crystallization
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