AWWA ACE63081

Iron-oxide-coated fiberglass (IOCFG hereafter) was developed and evaluated for arsenateremoval effectiveness. Different fiberglass types (cloth, mat and fibers) were coated with ironoxide using different combinations of temperature (25⁰C and 110⁰C), pH (1.3, 7 and 8.5) andinitial iron concentrations (0.25M and 2.5M) following the adsorption method. Iron loadings of11-34 mg Fe g^-1 was obtained on fiberglass at room temperature, which could be attributed to itssurface properties (surface area and silanol functional groups). Fiberglass insulation fibers wereselected based on their higher iron retention ability as compared to other fiberglass types. An ironloading of 231 mg g^-1 was obtained on fiberglass insulation fibers (pH 1.3, 110⁰C), which is ~ 5times higher than maximum reported iron loading on sand. Comparison of iron loading onfiberglass fibers and sand indicated that ~ 13 times lower initial iron concentration was requiredto achieve 45 mg g^-1 iron loading on fiberglass fibers as compared to sand. 10g L^-1 iron-oxide-coatedfiberglass insulation fibers (IOCFGI) with an iron loading of 231 mg Fe g^-1, developed atcoating conditions (pH 1.3, 0.25M Fe_initial, 110⁰C), were contacted with synthetic ground water(Well # 303, El Paso) containing 100 µg L^-1 arsenate. Experiments were conducted for 12h, 24hand 48h at pH 7.6 and 25⁰C. More than 90 % arsenate removal was achieved within 12 h of thesorption experiment by IOCFGI (0.01 mg arsenate g^-1 IOCFGI), which could be attributed to theiron oxide loading on fiberglass. This is the first study illustrating the application of fiberglass forthe development of iron-oxide based fibrous sorbents and its applicability in removing metals likearsenic for treating drinking water and wastewater. Includes 24 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

9

File Size:

1 file , 420 KB