An Intensified Hybrid Constructed Wetland for Polluted Channel Water Treatment
2022
Hernández-Rodríguez, I. A. | González-Blanco, G. | Aguirre-Garrido, J. F. | Beristain-Cardoso, R.
A hybrid system integrated by anaerobic filter–baffled subsurface horizontal constructed wetland (AFwet) was studied for treating polluted channel water, varying the hydraulic retention time (HRT) from 8 to 2 days. A conventional wetland (CW) and baffled conventional wetland (bCW) were used as control systems. The higher COD and ammonium nitrogen removal efficiencies were achieved at HRT of 8 days, of which the AFwet system was the best. At HRT of 2 days, COD removals for CW, bCW, and AFwet system were 54.22%, 72.96%, and 80.68%, respectively, whereas the ammonium removals were 34.16%, 50.07%, and 95.97%, correspondingly. The experimental results showed that the anaerobic filter intensified the ammonium removal, achieving removal efficiencies above 90%. The smallest footprint of 2.2 m²/PE (population equivalent) was obtained at hydraulic loading rate (HLR) of 0.14 m²/m³ day and organic loading rate (OLR) of 36.2 g COD/m² day. Nowadays, footprint and pollutant removal are significant indicators for the choice of constructed wetland.
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