Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


Ferric chloride addition was investigated for treatment of As-laden spent regeneration brine from ion exchange processes. Furthermore, varying conditions and calcium addition were investigated for the stabilization of the resulting As-laden solids. Arsenic, sulfate, bicarbonate, and chloride concentrations in the spent brine (300 mg/L, 605 mg/L, 305 mg/L, and 24 g/L, respectively) were orders of magnitude greater than typical drinking water treatment levels. Batch tests revealed that nearly 100% of the As in spent brine can be removed with a Fe/As molar ratio of 2 at circumneutral pH. The EPA TCLP and California WET tests were employed to determine the leachable Asin the treatment residuals. When the brine was treated using a Fe/As molar ratio of 5 and 20, the resultant As-laden sludge easily passed the TCLP and WET respectively. Addition of calcium hydroxide (Ca(OH)2) in the Ca/Fe molar ratio 1.5 decreased leachable As by 80% in the WET. Calcium addition in an optimal range decreased the chemical costs by 18% and reduced the mass of sludge produced by 20%. To further investigate the impact of calcium addition, leaching tests were performed using a landfill leachate.

Document Type: Research Article


Publication date: January 1, 2007

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more