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Evaluation of Methods to Determine Flocculation Procedure for Manure Separation

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

Citation:  Transactions of the ASABE. 51(6): 2093-2103. (doi: 10.13031/2013.25391) @2008
Authors:   M. Hjorth, M. L. Christensen
Keywords:   Animal slurry, Capillary suction time, Dewatering, Floc size, Solid-liquid separation, Surface erosion, Turbidity, Viscosity

Availability of reliable, low-cost, quick and easy analytical methods to determine the required additive addition at manure flocculation prior to solid-liquid separation would simplify initial laboratory tests and at-farm processes, and therefore presumably enhance the use of this environmentally and practically advantageous technology. Forty-four manure flocculations were prepared, and four solid-liquid separation techniques were applied. Separation performance was measured using five direct analytical methods and six indirect analytical methods. Five separation performance criteria were assessed individually using one direct analytical method. The predictability of a separation criterion by the remaining direct analytical methods as well as by the indirect analytical methods was then tested. Seven of the analytical methods proved to predict the separation criteria well and hence proved useful for determining the required additive addition: (1) dry matter content of solid, (2) dewaterability, (3) surface erosion from flocs, (4) liquid turbidity, (5) capillary suction time, (6) liquid viscosity, and (7) floc size. In addition, liquid turbidity and liquid viscosity may be useful for on-line application in full-scale separators.

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