Abstract
ABSTRACT THE results of a series of tests to optimize the particle suspension performance and efficiency of a 25 L lab scale suspended-particle, fixed-biomass anaerobic fermentor for the digestion of the liquid fraction of separated dairy manure are presented. Four different diameters of flat-bladed, disc-turbine impellers were examined. These were tested at various locations on the mixing shaft in a cylindrical test tank that was also equipped to accept a set of interchangeable auxiliary mixing devices. The largest diameter impellers were most efficient; impeller location had a significant effect on suspension efficiency. The suspension behavior and power requirements of the final design were independent of viscosity over the range of apparent viscosities that would typically be found in this type of an anaerobic dairy manure digester.
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