AWWA ACE68914

This powerpoint presentation begins by providing a brief overview of arsenic in drinking water. Treatment processes presented include the following: ion exchange; activated alumina; coagulation-filtration (with FeCl<sub>3</syb<); reverse osmosis (RO) and nanofiltration (NF); and, granular iron media. Study objectives include the following: determine the ferric chlorideconcentrations for treatment of brinescontaining high alkalinity, ionic strengthand arsenic concentrations; and,investigate the effect of various ionicstrengths and alkalinity levels on arsenicremoval and determine sludge volumegenerated and settling velocity (ongoingresearch). The experimental approach is presented, along with presentation conclusions that indicate the following: optimal conditions obtained for arsenic removalusing ferric chloride from drinking waters isdifferent from the ones for brines due to thehigh ionic strength, alkalinity and arsenicconcentration of the brine solutions;As can be efficiently removed from brines (upto 100%) using ferric chloride (at pH < 7). Highconcentration of FeCl₃ is required due to highconcentrations of arsenic compared to drinkingwater; and,it is therefore possible to use ion exchange forarsenic removal and treat the brine generatedto a non-hazardous level. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

22

File Size:

1 file , 1.1 MB