Agricultural Engineering Research, Volume 13 (2007)

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Modeling of pollution removal in constructed wetlands with horizontal subsurface flow
(2007) Brasil, Mozart da Silva; de Matos, Antonio Teixeira; Silva, Cláudio Mudado; Cecon, Paulo Roberto; Soares, Antonio Alves
This study was carried out to obtain the parameters of the kinetics equation for removal of the organic load and to evaluate the performance of four constructed wetland systems with subsurface flow (CWHSSF) measuring 24.0 x 1.0 x 0.3 m for treatment of the domestic wastewater from an anaerobic septic tank. The system was filled with a course of crushed stone that served as substrate for the macrophyte under study, which was cattail (Typha sp.). Two hydraulic retention times (t) of 1.9 and 3.8 days were used. Different volumetric organic load rates (116, 164 and 210 g m3 d-1) were tested. The following vari- ables were measured: chemical oxygen demand (COD) and total suspended solids (TSS). The parameters KV and n of the kinetic model for organic load removal were ob- tained by nonlinear regression. The organic load rates had no negative influence on pollutant removal. A hy- draulic retention time of 3.8 days was more effective in removing COD and TSS than a hydraulic retention time of 1.9 days. The model (Co/Ci = exp(-1.6221 t0.2491) for organic load removal, which is proposed in the present work, showed satisfactory adjustment and describes the organic load removal kinetics in the evaluated system appropriately.