Studies on Filtration Characteristics of Animal Waste (III)

Analysis of Filtration Characteristics by Parameter j, k of the Filtration Equation

Abstract

Parameters j and k of the filtration equation of the report (I) were calculated based on the experiments of the report (II) and the following results were obtained;
(1) Calculation curves of the equation showed that the parameter j represented the choking strength of a filter opening (Fig. 3-7), and that k represented the choking velocity (Fig. 3-8).
(2) Values of j calculated for suspended solutions of swine waste were almost constant. The mean value of j was 2.0.
(3) Values of k varied with filtration conditions. The values decreased with an increase of the sieve mesh up 240μ and kept a lower constant value for the sieve mesh greater than 240μ. As to the effect of using filter assistant compared with without assistant, k decreased obviously for the body-feed assistant and slightly decreased for the pre-coat method but k increased for the combination of body-feed and pre-coat assistant (Fig. 3-3).
(4) Very little effect of suctions pressure P_f on the k value was seen except at 150mmHg (Fig. 3-4).
(5) As to the effect of initial density W_o, k decreased slightly with increase of W_o in case of 74μ filter with combination-feed of hull charcoal but had almost constant values in the case of 246μ filter without assistant.