A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Subsurface flow constructed wetlands treating municipal wastewater for nitrogen transformation and removal
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, r2 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.
Subsurface flow constructed wetlands treating municipal wastewater for nitrogen transformation and removal
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, r2 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.
Subsurface flow constructed wetlands treating municipal wastewater for nitrogen transformation and removal
Kemp, Michael C. (author) / George, Dennis B. (author)
Water Environment Research ; 69 ; 1254-1262
1997-11-01
9 pages
Article (Journal)
Electronic Resource
English
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