Abstract
The specific cake resistance of mixed cakes was studied in filter-aid filtration using pre-coat and body feed. The influence of the relative amounts (weight ratio c/a) and the properties of the filter aid and the impurity on the specific cake resistance ( r) was determined. An exponential relationship between r and c/a was derived, based on the blocking behaviour of a filter cloth. This relationship was confirmed in the filtration of protein flocs from turbid beer, and yeast, iron hydroxide flocs and monosize polystyrene particles from water. Based on this law, an optimum body-feed dosage can be predicted in order to obtain a minimum cake resistance. In beer filtration special attention has been paid to the compressibility of the mixed cakes.
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