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With the Arsenic Rule being promulgated in early 2006, many water purveyors are obliged totake action to meet the reduced arsenic MCL of 0.010 mg/L. For water that also contains othercontainments exceeding the primary or secondary standards, simultaneous compliance couldbe very costly. The objective of this project was to determine the most cost-effective approach tosimultaneously remove arsenic and fluoride from groundwater.Coyote Springs Development area is a master planned community north of Las Vegas, Nevada thatwill use groundwater wells as its only potable water source. The source water wells contain onaverage 0.014 mg/L of arsenic and 2.1 mg/L of fluoride, exceeding the federal and stateregulated MCL for these two contaminants. Preliminary pressure filter pilot testing indicated thatboth arsenic and fluoride can be reduced to well below the regulated concentration with 40 to175 mg/L of alum. However, problems exist at such high alum doses, such as aluminum andturbidity breakthroughs, as well as short filters runs. Includes tables, figures.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 8File Size: 1 file , 300 KB