The total suspended solids (TSS) in the three treatments
matched the mean levels that were established for the experiment,
although values outside the preset limits of the treatments
were recorded during the culture (Fig. 1a). Significant differences
among treatments and weeks were observed for TSS (P < 0.05).
The interaction between these two factors was also significant
(P < 0.05), and indicates that in T200 differences between the weeks
were recorded, with significantly higher values occurring in the
fifth and sixth weeks. In the other treatments, there were no
significant differences in TSS over the weeks. The percentage of
volatile suspended solids (VSS) was different among all treatments
(P < 0.05): 86.7
±
0.6% (T200); 60.2
±
0.3% (T400–600) and
54.7
±
0.6% (T800–1000).