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strate concentrations are almost parallel. This suggests that data from one substrate concentration can be extrapolated with reasonable accuracy to another, provided that care is taken to ensure that the range over which the extrapolation is made is reasonable.

The effects of hydraulic loading on the substrate concentration profile within a chain of RDRs is shown in Figure 17.10 where the hydraulic loading decreases as the number of discs, N, is increased. As would be anticipated from the previous discussion, an increase in the hydraulic loading shifts the removal of substrate to reactors further down the chain. Figure 17.11 shows the same information plotted as a semilog function of the reactor number. Examination of that figure reveals that the linearity of the plot is best at lower hydraulic loading rates. This suggests that the extrapolation procedure in the preceding paragraph will work best at lower hydraulic loadings. It is also apparent from the figure that the slope of the semilog plot is a function of the hydraulic loading. This suggests that a plot of that slope versus the hydraulic loading would provide a way to interpolate between loadings.

Figure 17.9 Semi-log plot of the effect of influent substrate concentration on the substrate concentration profile through a chain of six RDRs.

Stages, M

Figure 17.9 Semi-log plot of the effect of influent substrate concentration on the substrate concentration profile through a chain of six RDRs.

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