As previously described, an important point was the necessity
to evaluate the removal efficiency of D. polymorpha independently
from any other settling process, which would remove the metals
adsorbed on suspended solids. The
filtering action of D. polymorpha
was
first evaluated on the effluent outflowing secondary settling.
However, since this effluent had a very low COD (10 mg/L) and consequently, a low suspended solid concentration (on which a
relevant amount of MEs is normally adsorbed) [39,40], the
following tests were performed with three other different
wastewater mixtures, previously
filtered through a 1 mm mesh bag
filter to remove coarse matter. This allowed us to evaluate the
filtration efficiency of D. polymorpha on wastewater with polluting
load and different amounts of suspended particulate, also taking
into account that this bivalve selects particles for food with a
diameter ranging between 15 and 40 mm
As previously described, an important point was the necessityto evaluate the removal efficiency of D. polymorpha independentlyfrom any other settling process, which would remove the metalsadsorbed on suspended solids. Thefiltering action of D. polymorphawasfirst evaluated on the effluent outflowing secondary settling.However, since this effluent had a very low COD (10 mg/L) and consequently, a low suspended solid concentration (on which arelevant amount of MEs is normally adsorbed) [39,40], thefollowing tests were performed with three other differentwastewater mixtures, previouslyfiltered through a 1 mm mesh bagfilter to remove coarse matter. This allowed us to evaluate thefiltration efficiency of D. polymorpha on wastewater with pollutingload and different amounts of suspended particulate, also takinginto account that this bivalve selects particles for food with adiameter ranging between 15 and 40 mm
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