In this regard, the wastewater pH value, which
influences the metal speciation, is kept constant in WWTPs and,
therefore, should not compromise the D. polymorpha purification
activity. Finally, with regard to the test with 100% inlet, there has
been a serious decline in the bivalves’ performance related to a
high mortality of the animals (data not shown). This result further
confirms how an excessive suspended particulate matter amount
and the possible presence of toxic substances into the WWTP can
decrease the bivalves
filtering capacity and even compromise their
health status. However, this aspect does not limit the possible
engineering of this method, since it would be sufficient to control
the particulate matter of the wastewater, as suggested by Binelli
et al. [21]. Moreover, despite the suspended matter concentration
represents a limiting factor of D. polymorpha
filtering capacity, it
should be noted that the specimens used in this study are the same
used in the pharmaceuticals and illicit drugs removal process,
described by Binelli et al. [21]. Despite an exposure to multiple
pollutants, the bivalves’ purifying ability is stable during the whole
experimental trial, representing a sure advantage in the use of this
very resistant organism. Furthermore, the data shown refer to the
ME removal within the
first 4 h of wastewaters exposure to D.
polymorpha, and that the bivalves’ performance can be improved
with increasing contact time between mollusks and wastewater, as
described below.
In this regard, the wastewater pH value, whichinfluences the metal speciation, is kept constant in WWTPs and,therefore, should not compromise the D. polymorpha purificationactivity. Finally, with regard to the test with 100% inlet, there hasbeen a serious decline in the bivalves’ performance related to ahigh mortality of the animals (data not shown). This result furtherconfirms how an excessive suspended particulate matter amountand the possible presence of toxic substances into the WWTP candecrease the bivalvesfiltering capacity and even compromise theirhealth status. However, this aspect does not limit the possibleengineering of this method, since it would be sufficient to controlthe particulate matter of the wastewater, as suggested by Binelliet al. [21]. Moreover, despite the suspended matter concentrationrepresents a limiting factor of D. polymorphafiltering capacity, itshould be noted that the specimens used in this study are the sameused in the pharmaceuticals and illicit drugs removal process,described by Binelli et al. [21]. Despite an exposure to multiplepollutants, the bivalves’ purifying ability is stable during the wholeexperimental trial, representing a sure advantage in the use of thisvery resistant organism. Furthermore, the data shown refer to theME removal within thefirst 4 h of wastewaters exposure to D.polymorpha, and that the bivalves’ performance can be improvedwith increasing contact time between mollusks and wastewater, as
described below.
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