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Effects of vegetation, season and temperature on removal pollutants in experimental floating treatment wetlands

(2010) WATER AIR AND SOIL POLLUTION. 212(1-4). p.281-297
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Abstract
The research and interest towards the use of constructed floating wetlands for (waste)water treatment is emerging as more treatment opportunities are marked out, and the technique is applied more often. To evaluate the effect of a floating macrophyte mat and the influence of temperature and season on physico-chemical changes and removal, two constructed floating wetlands (CFWs), including a floating macrophyte mat, and a control, without emergent vegetation, were built. Raw domestic wastewater from a wastewater treatment plant was added on day 0. Removal of total nitrogen, NH4-N, NO3-N, P, chemical oxygen demand (COD), total organic carbon and heavy metals (Cu, Fe, Mn, Ni, Pb and Zn) was studied during 17 batch-fed testing periods with a retention time of 11 days (February-March 2007 and August 2007-September 2008). In general, the CFWs performed better than the control. Average removal efficiencies for NH4-N, total nitrogen, P and COD were respectively 35%, 42%, 22% and 53% for the CFWs, and 3%, 15%, 6% and 33% for the control. The pH was significantly lower in the CFWs (7.08 +/- 0.21) than in the control (7.48 +/- 0.26) after 11 days. The removal efficiencies of NH4-N, total nitrogen and COD were significantly higher in the CFWs as the presence of the floating macrophyte mat influenced positively their removal. Total nitrogen, NH4-N and P removal was significantly influenced by temperature with the highest removal between 5A degrees C and 15A degrees C. At lower and higher temperatures, removal relapsed. In general, temperature seemed to be the steering factor rather than season. The presence of the floating macrophyte mat restrained the increase of the water temperature when air temperature was > 15A degrees C. Although the mat hampered oxygen diffusion from the air towards the water column, the redox potential measured in the rootmat was higher than the value obtained in the control at the same depth, indicating that the release of oxygen from the roots could stimulate oxygen consuming reactions within the root mat, and root oxygen release was higher than oxygen diffusion from the air.
Keywords
phosphorous, COD, nitrogen, wastewater treatment, combined sewer overflow, HORIZONTAL FLOW, COLD CLIMATES, SYSTEMS, DESIGN, EFFICIENCY, MICROCOSMS, NUTRIENTS, BUOYANCY, WASTE-WATER TREATMENT, FLOW CONSTRUCTED WETLAND, heavy metals

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Citation

Please use this url to cite or link to this publication:

Chicago
Van de Moortel, Annelies, Erik Meers, Niels De Pauw, and Filip Tack. 2010. “Effects of Vegetation, Season and Temperature on Removal Pollutants in Experimental Floating Treatment Wetlands.” Water Air and Soil Pollution 212 (1-4): 281–297.
APA
Van de Moortel, A., Meers, E., De Pauw, N., & Tack, F. (2010). Effects of vegetation, season and temperature on removal pollutants in experimental floating treatment wetlands. WATER AIR AND SOIL POLLUTION, 212(1-4), 281–297.
Vancouver
1.
Van de Moortel A, Meers E, De Pauw N, Tack F. Effects of vegetation, season and temperature on removal pollutants in experimental floating treatment wetlands. WATER AIR AND SOIL POLLUTION. 2010;212(1-4):281–97.
MLA
Van de Moortel, Annelies et al. “Effects of Vegetation, Season and Temperature on Removal Pollutants in Experimental Floating Treatment Wetlands.” WATER AIR AND SOIL POLLUTION 212.1-4 (2010): 281–297. Print.
@article{1075782,
  abstract     = {The research and interest towards the use of constructed floating wetlands for (waste)water treatment is emerging as more treatment opportunities are marked out, and the technique is applied more often. To evaluate the effect of a floating macrophyte mat and the influence of temperature and season on physico-chemical changes and removal, two constructed floating wetlands (CFWs), including a floating macrophyte mat, and a control, without emergent vegetation, were built. Raw domestic wastewater from a wastewater treatment plant was added on day 0. Removal of total nitrogen, NH4-N, NO3-N, P, chemical oxygen demand (COD), total organic carbon and heavy metals (Cu, Fe, Mn, Ni, Pb and Zn) was studied during 17 batch-fed testing periods with a retention time of 11 days (February-March 2007 and August 2007-September 2008). In general, the CFWs performed better than the control. Average removal efficiencies for NH4-N, total nitrogen, P and COD were respectively 35%, 42%, 22% and 53% for the CFWs, and 3%, 15%, 6% and 33% for the control. The pH was significantly lower in the CFWs (7.08 +/- 0.21) than in the control (7.48 +/- 0.26) after 11 days. The removal efficiencies of NH4-N, total nitrogen and COD were significantly higher in the CFWs as the presence of the floating macrophyte mat influenced positively their removal. Total nitrogen, NH4-N and P removal was significantly influenced by temperature with the highest removal between 5A degrees C and 15A degrees C. At lower and higher temperatures, removal relapsed. In general, temperature seemed to be the steering factor rather than season. The presence of the floating macrophyte mat restrained the increase of the water temperature when air temperature was > 15A degrees C. Although the mat hampered oxygen diffusion from the air towards the water column, the redox potential measured in the rootmat was higher than the value obtained in the control at the same depth, indicating that the release of oxygen from the roots could stimulate oxygen consuming reactions within the root mat, and root oxygen release was higher than oxygen diffusion from the air.},
  author       = {Van de Moortel, Annelies and Meers, Erik and De Pauw, Niels and Tack, Filip},
  issn         = {0049-6979},
  journal      = {WATER AIR AND SOIL POLLUTION},
  keywords     = {phosphorous,COD,nitrogen,wastewater treatment,combined sewer overflow,HORIZONTAL FLOW,COLD CLIMATES,SYSTEMS,DESIGN,EFFICIENCY,MICROCOSMS,NUTRIENTS,BUOYANCY,WASTE-WATER TREATMENT,FLOW CONSTRUCTED WETLAND,heavy metals},
  language     = {eng},
  number       = {1-4},
  pages        = {281--297},
  title        = {Effects of vegetation, season and temperature on removal pollutants in experimental floating treatment wetlands},
  url          = {http://dx.doi.org/10.1007/s11270-010-0342-z},
  volume       = {212},
  year         = {2010},
}

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