The results of recent studies on the variation of continuous liquid-phase mass-transfer coefficients in two-phase dispersions are reviewed. In particular, the effects of mechanically-induced agitation and fluid properties, including non-Newtonianism, on the mass-transfer coefficients are discussed. The results are interpreted and used to evaluate the physical factors which may determine the efficiency of aerobic biological waste treatment processes as exemplified by the activated-sludge process. Emphasis is placed on developing an understanding of fundamentals as a broad base from which to explore ways of improving the design and operation of aeration units.

This content is only available as a PDF.