2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:45 AM - 12:00 PM | COLLOIDAL AND TRULY-DISSOLVED METALS AND METALLOIDS IN WASTEWATER LAGOONS AND THEIR REMOVAL WITH FLOATING TREATMENT WETLANDS | 251 AB
COLLOIDAL AND TRULY-DISSOLVED METALS AND METALLOIDS IN WASTEWATER LAGOONS AND THEIR REMOVAL WITH FLOATING TREATMENT WETLANDS
While the fraction of total wastewater metals and metalloids in “dissolved” forms (defined here as < 450 nm) likely drive their potential for negative effects on receiving waters, this broad operational definition lumps truly-dissolved solutes (<1 nm) with small colloids and nanomaterials (1-450 nm; hereafter colloids). This distinction may be important as colloids and truly-dissolved solutes differ in their interactions with aquatic organisms and likely would require different strategies for their removal from wastewater. In this study, we examined the distribution of metal(loid)s between truly-dissolved and small colloidal fractions in six wastewater lagoon systems. We also examined the efficacy of “floating treatment wetlands” (FTWs)—which use emergent macrophytes grown hydroponically in floating mats—in removing metal(loids) and influencing the distribution of contaminants among truly-dissolved and small colloidal size ranges. In our survey of lagoons, we found that cadmium, copper, iron, lead, and zinc were most abundant as small colloids while aluminum, arsenic, chromium, and manganese were most abundant as truly-dissolved solutes. The FTWs were especially effective at removing those metal(loid)s that were abundant in colloidal forms, suggesting a potential role for FTWs in enhancing wastewater lagoon efficiency for some metal(loid) contaminants.
- Biogeochemistry
- Nanomaterials
- Water Quality
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Presenters/Authors
Lauren Sullivan
(), University of Montana, lauren.sullivan@umontana.edu;
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Benjamin Colman
(), University of Montana, ben.colman@umontana.edu;
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