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Nitrogen Removal in Integrated Constructed Wetland Treating Domestic Wastewater

Dzakpasu, Mawuli and Hofmann, Oliver and Harrington, Rory and Scholz, Miklas and Jordan, Siobhan N. and McCarthy, Valerie (2011) Nitrogen Removal in Integrated Constructed Wetland Treating Domestic Wastewater. Journal of Environmental Science and Health, Part A, 46 (7). pp. 745-750. ISSN 1093-4529

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Abstract

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 two 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 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 NO3-N. Temperature coefficients (θ) for N reduction in the ICW were low, and suggested that the variability in N removal by the ICW was independent of temperature.

Item Type: Article
Uncontrolled Keywords: Domestic wastewater; Nitrogen; Integrated constructed wetland; Wetland hydrology.
Subjects: Science
Research Centres: Centre for Freshwater and Environmental Studies
Depositing User: Concepta Woods
Date Deposited: 07 Feb 2012 18:58
Last Modified: 11 Nov 2014 16:10
URI: http://eprints.dkit.ie/id/eprint/110

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