lower than in the Control bioreactor (85 6 mg TSS/day), but with
a difference between bioreactors of only 21%. Thus, the addition of
50, 40 and 45 mg/L showed 36 (maximum 52%), 26 and 21%
reduction on sludge disposal, on average. As reductions achieved
have been decreasing, it follows that the concentration of 50 mg/L
would be the best condition for satisfactory reduction.