Rotating-disc contactors have been used in effluent treatment (Chapter 11). They utilize a growing microbial film on slow rotating discs to oxidize the effluent. Anderson and Blain (1980) have used the same principle to construct small fermenters of up to 40-dm3 working volume. A range of filamentous fungi, including species of Aspergillus, Rhizopus, Mucor and Penicil-liurrt, could be grown on the polypropylene discs. It has been possible to obtain yields of 80 g dm-3 of citric acid from A. niger using this design of fermenter.
Fig. 7.52. Gas entraîner nozzles of deep-jet fermenters (Reuss, 1992).
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Metabolism. There isn’t perhaps a more frequently used word in the weight loss (and weight gain) vocabulary than this. Indeed, it’s not uncommon to overhear people talking about their struggles or triumphs over the holiday bulge or love handles in terms of whether their metabolism is working, or not.