AWWA WQTC65803

This powerpoint presentation begins by providing a list of media adsorption benefits for small water systems, and presents two Awwa Research Foundation publications that discuss arsenic, perchlorate, nitrate residuals treatment, and using hydrogel for arsenic treatment and brine minimization. Topics addressed by the hydrogel Project included: optimize the sorbent for various water quality conditions; bench tests to "screen" hydrogel types for arsenic adsorption characteristics data; full-scale ion exchange brine / membrane concentrate treatment; leaching test on spent hydrogel media; and, estimate media cost for this adsorbent under typical operational conditions. Project summary included the following: about a dozen types of hydrogel were synthesized; comparable As removal was observed compared with commercial media for some type of hydrogel; interferences from other anions, such as nitrate, sulfate, silica, etc. were minimum; iron leaching was minimum from the hydrogel; and, hydrogel was dehydrated using air to reduce the spent media volume about 17 to 20 fold. Includes table, figures.