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Subsurface flow constructed wetlands treating municipal wastewater for nitrogen transformation and removal

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Abstract:

Research was conducted on pilot-scale, subsurface flow constructed wetland systems treating municipal wastewater. Increasing the hydraulic retention time (HRT) from 1.7 days to 4.3 days reduced the mean effluent NH4 concentration by 2.7 mg N/L. Hydroperiod manipulation caused a 2.9-mg N/L decrease in effluent NH4. The influent NH4 concentration for the 9-month study period averaged 21 mg N/L. The lowest average effluent NH4 concentration observed in single-stage treatment cells was 13 mg N/L. The mean effluent NH4 concentration from the second-stage cells of two wetland cells in series was 10 mg N/L. During the period from May through September, the second-stage cells produced an effluent NH4 concentration of 6 mg N/L. A variable-order kinetic model for sizing the second-stage cells of a series system yielded a coefficient of determination, r 2 of 0.94 for the summer NH4 removal data. The predicted HRT to reduce NH4 from 20 mg N/L to 5 mg N/L was 3.9 days, if the cells were subjected to cyclic draw and fill.

Keywords: DENITRIFICATION; HYDROPERIOD; NITRIFICATION; WASTEWATER; WETLANDS

Document Type: Research Article

DOI: https://doi.org/10.2175/106143097X126019

Publication date: 1997-11-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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