AWWA ACE58195

The adsorption of three estrogenic compounds (bisphenol A (BPA), 17-estradiol(E2), and 17+/--ethynyl estradiol (EE2)) on powdered activated carbons (PACs) wasinvestigated. Without preconcentration, method detection limits (MDL) using high performanceliquid chromatography (HPLC) with fluorescence detection at an excitationwavelength of 280 nm and an emission wavelength of 310 were 201 ng/L, 313 ng/L, and283 ng/L for BPA, E2, and EE2, respectively. In addition, the adsorption of E2 wasmeasured by liquid scintillation counting using tritium (3H) labeled E2 in the ng/L range.The order of compound removal by PAC (E2>EE2>BPA) corresponded with logKowvalues for the compounds (4.0, 3.7, 3.3, respectively). Kinetic and PAC dose-responseexperiments were conducted with the two PACs. Increasing contact time and PAC doseimproved compound removal. Freundlich isotherm parameters were fit to theexperimental data. This study confirms that PAC treatment is feasible for >99 % removalof three estrogenic compounds from raw drinking waters that may be at risk forcontaining such compounds. In addition, the removal percentage of E2 occurring at ng/Llevels by PAC was independent of their initial concentration. Includes 20 references, tables, figure.

Product Details

Edition:

Vol. - No.

Published:

06/15/2003

Number of Pages:

9

File Size:

1 file , 260 KB