Abiotic Capture of Stormwater Nitrates with Granular Activated Carbon

Andrew J. Erickson, John S. Gulliver, William A. Arnold, Cecilie Brekke, Mikal Bredal

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Stormwater runoff from urban and agricultural watersheds carries nitrate, which is difficult to remove because it is highly soluble and thought to be relatively inert in abiotic processes such as ion exchange and sorption. Thus, current practice relies on denitrification to capture nitrate in stormwater treatment practices, requiring storage of captured stormwater, anaerobic conditions, and enough residence time for the bacteria to convert nitrate to nitrogen gas. The purpose of this research was to (1) quantify abiotic nitrate removal and removal capacity of two granular activated carbons (GACs), and (2) illustrate use of GACs in stormwater treatment practices. Batch and upflow column experiments found that two commercially available GACs captured nitrate abiotically, although competition between (bi)carbonate and nitrate limited removal of nitrate. Compared with removal of nitrate by denitrification, abiotic capture of nitrate during storm events requires less stormwater storage volume and less residence time to remove nitrate because it accumulates on the media as stormwater passes through the filter. This suggests that nitrate can be removed from stormwater with less storage and smaller treatment practices.

Original languageEnglish (US)
Pages (from-to)354-363
Number of pages10
JournalEnvironmental Engineering Science
Volume33
Issue number5
DOIs
StatePublished - May 1 2016

Fingerprint

stormwater
Nitrates
Activated carbon
activated carbon
nitrate
Denitrification
denitrification
residence time
Carbonates
Watersheds
Runoff
anoxic conditions
Sorption
ion exchange
Ion exchange
Bacteria
Nitrogen
sorption
Gases
watershed

Keywords

  • BMPs
  • filtration
  • granular activated carbon
  • nitrate
  • nitrogen
  • retention
  • stormwater
  • urban runoff

Cite this

Abiotic Capture of Stormwater Nitrates with Granular Activated Carbon. / Erickson, Andrew J.; Gulliver, John S.; Arnold, William A.; Brekke, Cecilie; Bredal, Mikal.

In: Environmental Engineering Science, Vol. 33, No. 5, 01.05.2016, p. 354-363.

Research output: Contribution to journalArticle

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