Collectorless flotation has been investigated at a laboratory scale, a
s a separation technique applied effectively to biomass fine particles
(dead free) of Penicillium and Rhizopus; these were previously used f
or cadmium (a priority toxic pollutant) biosorption from dilute aqueou
s solutions. The basic parameters of dispersed-air flotation were stud
ied, i.e. solution pH, flotation time, ethanol addition (used as a con
venient frother), Cd and biomass concentration.