Trickle tower cell

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The undivided cell is used in cases where the electrode processes don t adversely affect one another negatively. The most common case is the anodic oxidation of an organic substrate combined with the cathodic production of hydrogen. If the evolution of oxygen as the anodic by-product can be excluded, this alternative is most convenient and—usually—the least costly. A typical thin-film cell is the trickle tower cell (Fig. 5b) [52]. The trickle tower cell has been applied to the production of propylene [53]. 

Figure 11.8 Design concepts of three further cells for metal recovery from dilute solutions of metal ions, (a) Cell with circulating bed cathode, (b) The Swiss-roll cell, (c) The trickle tower cell...

FIGURE 5.11. Cells for gas/liquid systems, (a) trickle tower cell, p.a. = Porous anode p.c. = porous cathode, d = distributor, b = bipolar electrodes, e = electrolyte thin film flow, s = separator (b) sieve plate cell. 

Figure 5. Thin-film cells, (a) Capillary-gap cell, (b) Bipolar trickle tower.

There are a few other kinds of industrial plants. An air-lift tower fermenter was developed by ICI for the production of single-cell protein from methanol which employs an external loop for heat removal. Trickle beds for the treatment of waste waters employ packing structures or packing elements of 4-6 cm dia and porosities above 50%. Microbial films are formed on the packing that react with the organic substrate and the air as the liquid flows down and the air up. 

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