Feedand Bleed Process

The feed-and-bleed process (see Figure 7.37.7) can be used when continuous product flow is required, the degree of demineralization is small, and changes in the feed concentration are substantial.

This process continuously blends and recycles a portion of the product stream with the fresh feed. The power demand of this electrodialysis system is constant under equi-

FIG. 7.37.6 Batch-recirculation electrodialysis. A, No mixing; B, Complete mixing.
FIG. 7.37.7 Feed-and-bleed electrodialysis.

librium conditions. The advantages of the process include the following: (1) it provides a continuous product and can accept feed water with any TDS concentration; (2) the membranes are at equilibrium condition; and (3) a minimum current density is required.

The disadvantages of this system include high power consumption; and the requirement for sophisticated process control. The recirculation rate can be high with this process, and the process can have several feed-and-bleed loops arranged in series to give the effect of multiple-staging with lower recycling rates.

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