Design considerations and applications for wetland treatment of high-nitrate waters

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Abstract

Nitrate contamination is a serious problem worldwide. By providing an ample supply of carbon and an anaerobic environment, wetlands are a valuable low technology for treating nitrate-contaminated waters with low organic carbon concentrations. Denitrification is apparently limited by the C:N ratio, with ratios > 5:1 resulting in > 90% nitrate removal efficiencies. The denitrification rate constant, V(NO3), varies in direct proportion to carbon supply. Several novel or emerging applications of wetlands include renovation of nitrate-contaminated aquifers (a pump-and-treat strategy), denitrification of nitrified sewage effluents, and treatment of irrigation return flows. Treatment of dual sources is also discussed. In arid regions with limited supplies of high quality water, nitrate treatment wetlands may play a significant role in the development of water resources.

Original languageEnglish (US)
Pages (from-to)389-395
Number of pages7
JournalWater Science and Technology
Volume38
Issue number1 pt 1
DOIs
StatePublished - Jan 1 1998
EventProceedings of the 1998 19th Biennial Conference of the International Association on Water Quality. Part 1 (of 9) - Vancouver, Can
Duration: Jun 21 1998Jun 26 1998

Keywords

  • Constructed wetlands
  • Denitrification
  • Groundwater
  • Irrigation
  • Nitrate
  • Recharge

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