it has to be highlighted that the differencesbetween the removal percentages measured at the end of the testsreached the 30% for Fe and Pb, while for Al, Ni and Mn the removalwas about 20–25% higher than controls. Thus, in only 4 h, zebramussels have been able to significantly decrease levels of most ofthe tested MEs, even if the removal of Cu was only 8% higher thannatural sedimentation. On the other hand, the time selection towe found statisticallysignificant difference between tests carried out with bivalves inthe pilot-plant and their respective controls for Al (F = 68.587p < 0.01), Mn (F = 38.710, p < 0.01), Pb (F = 26.183, p < 0.01), Cu(F = 22.861, p < 0.01) and Cr (F = 4.729, p < 0.01). In this regard, atthe end of the test the removal was around 20–25%, comparable tothe results obtained for the mixture 25% inlet/75% outlet for Al, Mn,Pb and Cu, while for the other tested metals it decreaseddramatically. Thefluctuating values obtained for Ni could bedue to the low concentration of this metal in the analyzedwastewater (<10 mg/L), taking into account the huge variability ofpollutant load in the inlet wastewaters. The role of the initialconcentrations of metallic elements into the considered mixtures
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