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Effect of aeration on pollutants removal, biofilm activity and protozoan abundance in conventional and hybrid horizontal subsurface-flow constructed wetlands

(2014) ENVIRONMENTAL TECHNOLOGY. 35(16). p.2086-2094
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Abstract
The large area demand of constructed wetlands (CWs) is documented as a weak point that can be potentially reduced by applying active aeration. The aim of this study was, therefore, to understand the effects of aeration on the treatment performance, the biofilm activity, the protozoan population size and potential CW footprint reduction of different horizontal flow (HF) CW configurations. Two experimental periods were considered: a first period with low organic loading rate (OLR) and a second period with high OLR. Three HF CW configurations were compared: a conventional (control), an aerated and a hybrid CW (aerated followed by a non-aerated CW). The results obtained reinforced the competence of aerated CW for organic matter removal (81–89% of chemical oxygen demand) while for nitrogen elimination the control (19–24%) and hybrid (8–41%) systems performed better than the aerated system (-6% to 33%). Biofilm activity and protozoa abundance were distinctly higher at the inlet zones when compared with the outlet zones of all CWs, as well as in the aerated systems when compared with the non-aerated CWs. The protozoan abundance increased with an increase in the OLR and ciliates were found to be the dominant group. Overall, the active aeration highlighted the efficiency and stability of the CWs for organic matter removal and thus can be used as a promising tool to enhance microbial activity and grazing by protozoa; eventually reducing solid accumulation in the bed media. These beneficial effects contribute to reduce the CWs’ area requirements.
Keywords
aeration, biofilm, horizontal flow constructed wetlands, organic matter, protozoa, WASTE-WATER TREATMENT, ARTIFICIAL AERATION, NUTRIENT REMOVAL, NITROGEN, DESIGN, SYSTEM, PLANT, PERFORMANCE, EFFICIENCY, BACTERIA

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MLA
Zapater-Pereyra, M, E Gashugi, Diederik Rousseau, et al. “Effect of Aeration on Pollutants Removal, Biofilm Activity and Protozoan Abundance in Conventional and Hybrid Horizontal Subsurface-flow Constructed Wetlands.” ENVIRONMENTAL TECHNOLOGY 35.16 (2014): 2086–2094. Print.
APA
Zapater-Pereyra, M., Gashugi, E., Rousseau, D., Alam, M., Bayansan, T., & Lens, P. (2014). Effect of aeration on pollutants removal, biofilm activity and protozoan abundance in conventional and hybrid horizontal subsurface-flow constructed wetlands. ENVIRONMENTAL TECHNOLOGY, 35(16), 2086–2094.
Chicago author-date
Zapater-Pereyra, M, E Gashugi, Diederik Rousseau, MR Alam, T Bayansan, and PNL Lens. 2014. “Effect of Aeration on Pollutants Removal, Biofilm Activity and Protozoan Abundance in Conventional and Hybrid Horizontal Subsurface-flow Constructed Wetlands.” Environmental Technology 35 (16): 2086–2094.
Chicago author-date (all authors)
Zapater-Pereyra, M, E Gashugi, Diederik Rousseau, MR Alam, T Bayansan, and PNL Lens. 2014. “Effect of Aeration on Pollutants Removal, Biofilm Activity and Protozoan Abundance in Conventional and Hybrid Horizontal Subsurface-flow Constructed Wetlands.” Environmental Technology 35 (16): 2086–2094.
Vancouver
1.
Zapater-Pereyra M, Gashugi E, Rousseau D, Alam M, Bayansan T, Lens P. Effect of aeration on pollutants removal, biofilm activity and protozoan abundance in conventional and hybrid horizontal subsurface-flow constructed wetlands. ENVIRONMENTAL TECHNOLOGY. 2014;35(16):2086–94.
IEEE
[1]
M. Zapater-Pereyra, E. Gashugi, D. Rousseau, M. Alam, T. Bayansan, and P. Lens, “Effect of aeration on pollutants removal, biofilm activity and protozoan abundance in conventional and hybrid horizontal subsurface-flow constructed wetlands,” ENVIRONMENTAL TECHNOLOGY, vol. 35, no. 16, pp. 2086–2094, 2014.
@article{5779018,
  abstract     = {The large area demand of constructed wetlands (CWs) is documented as a weak point that can be potentially reduced by applying active aeration. The aim of this study was, therefore, to understand the effects of aeration on the treatment performance, the biofilm activity, the protozoan population size and potential CW footprint reduction of different horizontal flow (HF) CW configurations. Two experimental periods were considered: a first period with low organic loading rate (OLR) and a second period with high OLR. Three HF CW configurations were compared: a conventional (control), an aerated and a hybrid CW (aerated followed by a non-aerated CW). The results obtained reinforced the competence of aerated CW for organic matter removal (81–89% of chemical oxygen demand) while for nitrogen elimination the control (19–24%) and hybrid (8–41%) systems performed better than the aerated system (-6% to 33%). Biofilm activity and protozoa abundance were distinctly higher at the inlet zones when compared with the outlet zones of all CWs, as well as in the aerated systems when compared with the non-aerated CWs. The protozoan abundance increased with an increase in the OLR and ciliates were found to be the dominant group. Overall, the active aeration highlighted the efficiency and stability of the CWs for organic matter removal and thus can be used as a promising tool to enhance microbial activity and grazing by protozoa; eventually reducing solid accumulation in the bed media. These beneficial effects contribute to reduce the CWs’ area requirements.},
  author       = {Zapater-Pereyra, M and Gashugi, E and Rousseau, Diederik and Alam, MR and Bayansan, T and Lens, PNL},
  issn         = {0959-3330},
  journal      = {ENVIRONMENTAL TECHNOLOGY},
  keywords     = {aeration,biofilm,horizontal flow constructed wetlands,organic matter,protozoa,WASTE-WATER TREATMENT,ARTIFICIAL AERATION,NUTRIENT REMOVAL,NITROGEN,DESIGN,SYSTEM,PLANT,PERFORMANCE,EFFICIENCY,BACTERIA},
  language     = {eng},
  number       = {16},
  pages        = {2086--2094},
  title        = {Effect of aeration on pollutants removal, biofilm activity and protozoan abundance in conventional and hybrid horizontal subsurface-flow constructed wetlands},
  url          = {http://dx.doi.org/10.1080/09593330.2014.893024},
  volume       = {35},
  year         = {2014},
}

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