Removal of emerging contaminants of concern by alternative adsorbents.
The effective removal of emerging contaminants of concern (ECCs) such as endocrine-disrupting chemicals, pharmaceutically active compounds, personal care products, and flame retardants is a desirable water treatment goal. In this study, one activated carbon, one carbonaceous resin, and two high-silica zeolites were studied to evaluate their effectiveness for the removal of an ECC mixture from lake water. Adsorption isotherm experiments were performed with a mixture of 28 ECCs at environmentally relevant concentrations ( approximately 200-900 ng/L). Among the tested adsorbents, activated carbon was the most effective, and activated carbon doses typically used for taste and odor control in drinking water (<10 mg/L) were sufficient to achieve a 2-log removal for most of the tested ECCs. The carbonaceous resin was less effective than the activated carbon because this adsorbent had a smaller volume of pores in the size range required for the adsorption of many ECCs ( approximately 6-9A). For the removal of ECC mixture constituents, zeolites were less effective than the carbonaceous adsorbents. Because zeolites contain pores of uniform size and shape, a few of the tested ECCs with matching pore size/shape requirements were well removed, but the adsorptive removal of others was negligible, even at zeolite doses of 100 mg/L. The results of this study demonstrate that effective adsorbents for the removal of a broad spectrum of ECCs from water should exhibit heterogeneity in pore size and shape and a large pore volume in the 6-9A size range.
Rossner
Alfred
A
Environmental Science Center EULA-Chile, University of Concepción, Concepción, Chile.
Snyder
Shane A
SA
Knappe
Detlef R U
DR
D000327:Adsorption; D052244:Endocrine Disruptors / Q000032:analysis; D005618:Fresh Water / Q000737:chemistry*; D004364:Pharmaceutical Preparations / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry* / Q000145:classification
D052244:Endocrine Disruptors; D004364:Pharmaceutical Preparations; D014874:Water Pollutants, Chemical; D017641:Zeolites