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Nitrogen transformations and mass balance in an integrated constructed wetland treating domestic wastewater

Dzakpasu, M, Scholz, M, McCarthy, V and Jordan, S 2014, 'Nitrogen transformations and mass balance in an integrated constructed wetland treating domestic wastewater' , Water Science and Technology, 70 (9) , pp. 1496-1502.

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Nitrogen (N) transformations and removal in integrated constructed wetlands (ICWs) are often high, but the contributions of various pathways, including nitrification/denitrification, assimilation by plants and sediment storage, remain unclear. This study quantified the contributions of different N removal pathways in a typical multi-celled ICW system treating domestic wastewater. Findings showed near complete average total N retention of circa 95% at 102.3 g m2 yr1 during the 4-year period of operation. Variations in total N and NH4–N removal rates were associated with effluent flow volume rates and seasons. According to the mass balance estimation, assimilation by plants and sediment/soil storage accounted for approximately 23% and 20%, respectively, of the total N load removal. These were the major N removal route besides microbial transformations. Thus, the combination of plants with high biomass production offer valuable opportunities for improving ICW performance. The retrieval and use of sequestered N in the ICW sediment/soils require coherent management and provide innovative and valuable opportunities.

Item Type: Article
Themes: Built and Human Environment
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre (SIRC)
Journal or Publication Title: Water Science and Technology
Publisher: IWA Publishing
Refereed: Yes
ISSN: 0273-1223
Related URLs:
Funders: Funder not known
Depositing User: B Li
Date Deposited: 16 Mar 2015 16:54
Last Modified: 29 Oct 2015 00:18

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