and aggregates
entrainment (Rodrigues and Rubio, 2003; Oliveira et al., 2010).
According to the authors, the very rapid rising rate exhibited by
these aggregates depends on the number of bubbles attached or
entrapped inside the flocs, and this “aeration degree” is a function
of the aggregates characteristics (hydrophobicity). The high
average rise rate, reported in Table 3, is in agreement with those
mechanisms, once aerated flocs generated during wash wastewater
treatment are exposed to adsorption/co-precipitation of surfactant