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Description: The return of animal manure to the soil is desirable for the recycling of essential plant nutrients. The use of wheeled transport equipment to accomplish this has been a standard practice but undesirable soil compaction can occur. For this reason there is considerable interest in utilizing pipeline irrigation equipment for conveying and distributing animal manure. Hart et al. (4) investigated pumping characteristics of swine, poultry, and dairy manure slurries based on short lengths of 2 inches (5 cm) nominal diam galvanized iron pipe. Dougherty and Broughtona carried out studies on pumping systems for swine and dairy manures. Their study indicated that for dairy herds in excess of 100 animals, there were economic advantages to pumping systems, particularly when the equipment could also be used for irrigation. The flow of solid-liquid mixtures (i.e., slurries) in pipes differs from that of common liquids. In addition to laminar, transitional, and turbulent liquid flow there is either homogeneous or heterogeneous slurry flow. Aude et al. (1) define a homogeneous slurry as one in which the solids are uniformly mixed with the liquid fraction and high concentrations of fine particle sizes may be present. These slurries usually exhibit non-Newtonian rheology. Manure slurries are included in this category along with sewage sludge and clay slurries. Heterogeneous slurries tend to have lower solids content and large particle sizes that cause a vertical solids concentration gradient in a horizontal pipe even at high flow rates. Design criteria based on water are inadequate for these slurries. However, very little work has been done with animal manure slurries, and thus their rheological properties are largely unknown. Because knowledge of fluid flow behavior is required to properly design a pipeline system, this study was initiated to provide design data for pumping dairy manure slurries.

Keywords: flow properties of dairy waste slurries
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Citation: Staley, L.M., Tung, M.A. and G.F. Kennedy 1973. FLOW PROPERTIES OF DAIRY WASTE SLURRIES. Canadian Agricultural Engineering 15(2):124-127.
Volume: 15
Issue: 2
Pages 124 - 127
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Date: 1973
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Coverage: Canada
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