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EPA proposed a new MCL of 5 ppb for arsenic in June 2000. Although EPA iscurrently accepting comments on this highly debatable new regulation, it isanticipated that the finalized rule will be set at 10 ppb or even lower, posing asignificant technological challenge to thousands of utilities at any size.Coagulation assisted membrane process (CAMPs), particularly for low pressuremembranes, is considered the most promising technology for arsenic removalbecause it can be applied to a wide range of water qualities, including waterthat contains high turbidity (for surface water), iron and manganese, and otheranions, such as sulfate and nitrate. Compared to ion exchange and activatedalumina, CAMPs require fewer chemicals and generate very small quantities ofwaste. This paper will present results from a demonstration project funded by theArsenic Research Partnership. To fully demonstrate the long-term performance ofCAMP, this project evaluated a wide variety of membranes at the same time. Totake the full advantage of a membranes' capability in solid/liquid separation,immersed membranes coupled with novel adsorbents will be investigated as part ofthis study. Such adsorbents include: heated iron oxide particles (HIOPs);powdered activated alumina ( -Al2O3); powdered manganese dioxide (MnO2); and,magnet- impregnated ion exchange media such as MIEXTM. This full-scale pilottesting is the first large-scale head-to-head comparison of a wide range ofpromising membrane technologies operating year-round at the same sites (Billings,Montana

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Edition: Vol. - No. Published: 05/01/2001 Number of Pages: 12File Size: 1 file , 480 KB