One Process Removes Arsenic, Iron from Water System

Sponsored by

Recently enacted arsenic compliance standards have forced cities large and small to comply with a maximum contaminant level of 10 parts per billion (ppb) or face stiff fines and even the potential shutdown of wells. Smaller towns such as Cannonville, UT, have the most difficulty meeting those standards because of manpower and budget constraints.

To help meet the standard, Cannonville turned to Filtronics Inc. of Anaheim, CA, and its proprietary arsenic removal process.

Filtronics provides systems that can process up to 29 mgd, but it was one of the company’s more compact FV series vertical filters - equipped with Electromedia® I - that helped Cannonville and its population of just 200 people. Located near Bryce Canyon National Park, Cannonville is a small community with an understandably small public-service budget.

“We looked at some other ways to remove arsenic,” said Mayor Al Fletcher, “but disposal was costly.”

The city found that the initial cost of the Filtronics plant was competitive with other systems on the market, but because the company’s filter media is permanent, operation and maintenance costs are lower than that of many other arsenic removal methods. Some filter systems, for example, are expensive to run: the media itself is costly, and when exhausted, must be replaced. And if the used media - contaminated with a high concentration of arsenic - isn’t handled properly, it is considered hazardous waste.

There are no such worries with Filtronics Electromedia® I.


Located near Escalante National Monument and Bryce Canyon National Park, the town of Cannonville shares some striking terrain and similar drinking water challenges.
Click here to enlarge image

The granular media accommodates a 10 gpm/sq. ft. flow rate, and the backwash to filtration ratio is less than 2 percent. Because the arsenic is removed from the media more frequently and in lower concentrations, it can be disposed of in a sanitary sewer, or the sludge can be collected and sent to a sanitary landfill.

Treatment for Cannonville has been successful, particularly in light of the fact that the city’s well also has a high concentration of iron in the raw water. Removal of iron is also a common application for Electromedia® I.

“We have a 1300 foot deep well and pump about 300 gpm,” said part-time plant manager Larry Fletcher, who is also the mayor’s brother. “Arsenic in the raw water is about 40-45 ppb, which is reduced essentially to zero with the filter. But there is also a lot of iron - it’s not very nice water. Treatment is kind of a two-prong approach, because it takes out the iron.”

In terms of maintenance, the system has also proven successful, needing very little attention since its 2003 installation.

“I check on the system once per day, but it pretty much takes care of itself,” said Larry Fletcher.

Sponsored by

TODAY'S HEADLINES

EPA, Army finalize Clean Water Rule for protection of U.S. water resources

The Environmental Protection Agency and U.S. Army have reached a historic milestone by officially finalizing the Clean Water Rule, designed to protect streams and wetlands that form the foundation of the nation's water resources from ongoing threats of pollution and degradation.

KUB meets consent decree milestones with sewer rehabilitation projects

As required under a 2005 consent decree, the Knoxville Utilities Board of Tennessee has completed a combination of sewer replacement, rehabilitation and ongoing maintenance work with two supplemental environmental projects throughout Knoxville and Knox County.

Pennsylvania DEP invokes drought watch declaration for 27 counties

As a result of below-average groundwater and surface water levels across Pennsylvania, the Department of Environmental Protection has invoked a drought watch for 27 counties across the state.

American Water officially unveils 2014 Online Annual Report

American Water has officially unveiled its 2014 annual report summary and Form 10-K online.

FOLLOW US ON SOCIAL MEDIA