Abstract
AbstractFouling of the hollow‐fiber ultrafiltration membrane was not significant. However, there was a considerable difference in the steady‐state permeate flux for each of the solutions studied. The feed solution containing 300 g/L glucose and 33 g/L liquefied starch resulted in the lowest steady‐state flux of 1.48L/m2/h (LMH). Performance of the membrane as a function of transmembrane pressure, and flow rate was also evaluated. At a given transmembrane pressure, flow rate had no effect on permeate flux indicating that the membrane module was operating in the pressure controlled region. Concentration polarization effects were also minimal at the operating conditions studied. At the enzyme concentrations employed in these studies, loss of enzyme activity due to membrane leakage, mechanical shear, thermal inactivation and/or membrane “poisoning” had little effect on reactor stability and glucose production.
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