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Perchlorate Removal Via Iron-Preloaded GAC and Borohydride Regeneration (PDF)

  • Author(s): Na, Chongzheng; Cannon, Fred S.; Hagerup, Ben
  • Publications: Journal - American Water Works Association
  • Issue Date: November 2002
  • Volume / Number: 94, Number 11
  • Page(s): 90-102
  • DOI:
  • Product Number: JAW_0057219
Full Text: pdf

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Abstract

Tailored granular activated carbon (GAC) can reduce groundwater perchlorate levels from 60-80 µg/L to below detection. Specifically, rapid small-scale column tests, also called RSSCTs, showed that by preloading GAC with iron-oxalic acid, the GAC adsorption capacity could be improved up to 42%. When the preloaded GAC became saturated with perchlorate, 65-74% of the GAC's original adsorption capacity could be restored by chemically regenerating the GAC with sodium borohydride. This chemical regeneration could be achieved with the use of a small fraction of the water that had been processed during the water treatment cycle. The waste stream from chemical regeneration contained concentrated perchlorate levels as high as 7,000-15,000 µg/L. With this approach, the simulations described in this article indicated that when two tailored GAC beds were operated in series with a 40-min empty-bed contact time, they could provide water treatment service for 60-75 days during the first operations cycle; following chemical regeneration, the GAC beds could provide about an additional 30-40 days of water service for several successive treatment and regeneration cycles.

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