Nitrogen removal in an integrated constructed wetland treating domestic wastewater

Mawuli Dzakpasu, Oliver Hofmann, Miklas Scholz, Rory Harrington, Siobhan N. Jordan, Valerie McCarthy

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16 Citations (Scopus)


The nitrogen (N) removal performance of a 3.25 ha Integrated Constructed Wetland (ICW) treating domestic wastewater from Glaslough village in County Monaghan, Ireland, was evaluated in this study. The ICW consists of two sludge ponds and five shallow vegetated wetland cells. Influent and effluent concentrations of two N species, namely, ammonia-nitrogen (NH3-N) and nitrate-nitrogen (NO3-N), which were measured weekly over 2 years, together with hydrology of the ICW provided the basis for this evaluation. The influent wastewater typically contained 40 mg L-1 NH3-N and 5 mg L-1 NO3-N. Concentrations of N in the ICW effluent were typically less than 1.0 mg L-1 for both species. Overall, a total load of 2802 kg NH3-N and 441 kg NO3-N was received by the ICW and a removal rate of 98.0 % and 96.9 %, respectively, was recorded. Average areal N loading rate (245 mg m-2 d-1 NH3-N and 38 mg m-2 d-1 NO3-N) had a significant linear relationship with areal N removal rate (240 mg m-2 d-1 and 35 mg m-2 d-1, respectively) for both species. The areal first-order N removal rate constants in the ICW averaged 14 m yr-1 for NH3-N and 11 m yr-1 for NO 3-N. Temperature coefficients (θ) for N reduction in the ICW were lower and less than unity for NO3-N, suggesting that the variability in N removal by the ICW was marginally influenced by temperature.

Original languageEnglish
Pages (from-to)742-750
Number of pages9
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Issue number7
Publication statusPublished - Jun 2011
Externally publishedYes


  • Domestic wastewater
  • integrated constructed wetland
  • nitrogen
  • wetland hydrology

ASJC Scopus subject areas

  • Environmental Engineering


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