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Technology and Engineering
- ISSN: 2333-2581
- Modern Environmental Science and Engineering
Water Budget of Constructed Wetland System with Subsurface Vertical Flow in Sub-Humid Tropical Climate
Édio Damásio da Silva Júnior1, Rogério de Araújo Almeida2, Elisa Rodrigues Siqueira2 and
Ábio Roduvalho da Silva2
1. Department of Environmental Engineering, Goiano Federal Institute – Campus Rio Verde, Rio Verde (Goiás), Brazil
2. School of Civil Engineering, Federal University of Goiás, Goiânia (Goiás), Brazil
Abstract: This study evaluated, over a period of 98 days, the water budget of a constructed wetland with vertical subsurface flow for treatment of septic waste in sub-humid tropical climate. It was implanted an experimental station that consisted of two treatment cells with about 20 m² each. One was planted with Vetiver Grass (Chrysopogon zizanioides) and the other remained without vegetation to act as witness. Input volumes and liquid exit of each bed were measured. In a planted cell, 38.35% of the net that has entered was retained or evapotranspirated and 61.65% was drained. The control cell showed 16.30% of retention/evaporation and 83.70% of liquid drainage. The planted cell had greater reduction in the net infiltration capacity and increasing of humidity of surface sludge, while the control cell had higher sludge drying capacity. In general, the retaining and releasing water to the atmosphere in planted system was almost twice more than that found in no planted one.
Key words: roots zone, sludge dewatering, evapotranspiration
