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AWWA WQTC69484
- Regenerating Spent Zeolites with UV and UV/H2O2 to Enhance Removal of Endocrine Disrupting Compounds
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
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Endocrine disrupting compounds (EDCs) are a continual source of concern in water treatment, as they are biologically activeat nanogram per liter concentrations, and have been shown to cause sexual developmentdisruption in aquatic wildlife. Adsorption processes have shown promise as excellentEDC removal processes, due to the hydrophobic nature of many EDCs and the resultingaffinity of these compounds for hydrophobic surfaces. In addition to traditional sorptionmethods involving activated carbon, recent work has been examining the effectiveness ofhigh silica zeolites for removal of hydrophobic contaminants. Bench scale adsorptionstudies are performed to collect baseline adsorption data for three EDCs (E1, E2, EE2) onthree zeolytes (ranging from low to high hydrophobicity). The efficiency of UV andUV/H<sub>2</sub>O<sub>2</sub> treatment is being studied with bench-scale collimated beam studies.Preliminary data indicated 90% of adsorbed E1 can be removed from DAY zeolite withUV alone at a dose of 2000 mJ cm<sup>-2</sup>. While E1 is structurally similar to E2 and EE2, theefficiency of direct UV for degrading these compounds varies significantly, as indicatedby the variation in quantum yield values. Therefore, UV/H<sub>2</sub>O<sub>2</sub> AOP was also tested forremoving and oxidizing the EDCs. Includes 21 references, tables, figures.
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