The disposal of spent liquors from the pickling of iron by an electrodialytic process is described, sulphuric acid of a concentration suitable for re‐use and metallic iron being recovered. The power cost of the treatment is a function of the current efficiency and the voltage across the cell. Current efficiencies for various concentrations of recovered acid are experimentally obtained and shown to apply to all pickle liquor compositions. Experiments on one synthetic pickle liquor have established a basis for calculating the cell voltage. It is then possible to deduce the quantitative effect on the power cost of the treatment, of operating procedure, electrode‐membrane distances, the iron content of the treated liquor, the proportion of iron in the spent pickle liquor and the total concentration of the spent liquor.
Two experiments involving 130 rats were conducted to evaluate the nutritive value of three microbial proteins for rats. In one of the experiments, diets containing 0, 20 and 30% microbial protein were offered for 21 days. Inclusion of up to 20% microbial protein did not significantly affect liveweight gain but a comparatively poor feed conversion efficiency was manifested at levels above 10% inclusion of the protein concentrate in the diet. In a second experiment, the microbial protein was incorporated at a level of 30% as the sole source of protein to measure the digestibility of nitrogen and RNA. The apparent digestibility of nitrogen was 80 - 89% and that of RNA was 76 - 83%.
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