Membrane filtration technology is emerging as the technology of choice for safe drinking water. Large and small communities around the world currently use the Pall Aria System to remove parasites, including cryptosporidia and giardia cysts and oocysts that can contaminate drinking water and adversely affect public health. The new verification enables these communities to remove both arsenic and parasites cost efficiently. The Pall system is also employed by a wide range of industries to clean up wastewater to prevent additional arsenic from entering the drinking water supply.
Unlike other methods of arsenic removal, such as reverse osmosis and adsorption media, membrane filtration offers a less costly and long-term solution. It does not require a major upfront capital investment, high costs to operate or frequent regeneration and purchase of media. The Pall Aria System works by the addition of an iron-based coagulant, such as ferric chloride, to the water. The contaminating arsenic is adsorbed onto positively charged ferric hydroxide particles, which are then removed by microfiltration.
"The arsenic removal verification opens up a whole new market for Pall Water Processing, which is currently one of the fastest growing businesses of Pall Corporation. This past year our sales to municipal and community water systems have grown over 26 percent," adds Mr. Seibert.
Arsenic Hot Spots and Public Health Implications
Arsenic levels across the U.S. can vary greatly. Although there are some geographic hot spots, the highest arsenic levels in the U.S. are found mostly in states west of the continental divide. However, several New England states such as New Hampshire and Maine have reported that as many as 30% and 14%, respectively, of their public water systems have arsenic levels above the new standard.