Regarding to inorganic membranes, when US were applied submerging
the membrane module inside the US bath, in the bottom
of the tank (0 cm), it was achieved slightly higher USENH values
than those obtained placing the membrane module at 3 cm from
the bottom of the tank, especially for Inside Céram 50 kDa. Similar
results were presented by Chen et al. [34], who demonstrated that
US application to the filtration of a model solution with colloidal
silica particles help to reduce the fouling caused over that particles
in UF ceramic membranes. In addition, these authors demonstrated
that the optimum distance between the membrane module and
the transducers was 1.7 cm (minimum distance tested between
membrane module and transducers).