AWWA ACE70650

This powerpoint presentation begins by providing a brief overview of arsenic contamination, and alternative processes for removing arsenic. The advantages of iron preloaded granular activated carbon (GAC) are presented, along with experimental set-up that consisted of iron tailored GAC tested in rapid small-scalecolumn tests (RSSCTs) and pilot-scaletrials at Penn State. Pilot columns, electrolytic cell, branched iron rods, and laboratory columns are presented, along with conclusions that indicate the following: in RSSCT testing, the temperature of iron precuring(60-100ºC) made little difference;RSSCT and pilot column results agreed closely(RSSCT designed via proportional diffusivity);the branched rod configuration with highersurface area worked more effectively thanstraight rods that had less surface area; combining rods with iron tailored GACprovided effective As removal at start-up;the most effective system combinedbranched iron rods with Fe-GAC, extendingBV of 10 ppb As to 43,000 BV;electrolytic cells were effective for Asremoval but columns experienced pressureand voltage buildup; and,effluent iron < 0.2 mg/L for all runs, exceptwhen rods extend to media bottom. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

28

File Size:

1 file , 1.5 MB