which depends on the WWTP inlet, must always be
considered when drawing conclusions in terms of percent
removal: if these are very low, small variations (which could also
be partly due to analytical reasons) assume relevant percent
weight. In both the considered tests (25% inlet/75% outlet and 50%
inlet/50% outlet mixtures) negative values of sedimentation,
comprised in a range of
5 and
10%, are observable; these
values are likely to be related to the coefficient of variation of the
method used to perform the wastewater ME quantification. These
data do not appear to be random, because, except for the
fluctuating values of Ni (Fig. 4E), Mn and Pb showed null
sedimentation values in