Untreated and treated samples were analysed for size distribution
using a Malvern Mastersizer laser diffractometer.
This is a laserbeam scattering instrument that operates on
the principle of Fraunhofer Diffraction Theory. The particle
size detection range is between 5 and 300 m. This size
range is within the range indicated to represent most of the
activated sludge flocs (Jorand et al. [25]). The particle diameters
were calculated assuming spherical particles. Samples
were diluted before analysis to obtain particle counts within
the concentration limits of the analyser.