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

NSF to begin testing of new ballast water treatment system for USCG type approval

The NSF International Independent Laboratory will begin the testing of Evoqua's SeaCURE ballast water management system in preparation of the U.S. Coast Guard's full type approval. 

SUEZ to expand major Middle East WWTP in new contract

SUEZ ENVIRONNEMENT, through its subsidiary Degrémont, has been commissioned by the Government of Qatar's Public Works Authority (Ashghal), in consortium with its Japanese partner Marubeni Corporation, to expand the Doha West wastewater treatment and recycling plant.

IDA announces deadline extension for 2014-2015 Fellowship Award applications

The International Desalination Association has extended the deadline of applications for its 2014-15 Fellowship Program, giving candidates until Jan. 31, 2015 to apply.

Texas launches new state-of-the-art water technology accelerator

The Texas Research & Technology Foundation has launched AccelerateH2O -- the Texas Water Technology Accelerator -- a new, state-of-the-art center focused on advancing new and existing water technologies.

FOLLOW US ON SOCIAL MEDIA