Keywords: crocodile pond wastewater, constructed wetlands, vertical subsurface flow, Macrophyte, Arundo donax, bulrush, organic removal, nutrient removal, wastewater treatment, chemical oxygen demand, COD
Performance studies on constructed wetland for treatment of crocodile pond wastewater
Crocodile pond wastewater has high Biochemical Oxygen Demand (BOD5) (100 mg/L), phosphorus (6 mg/L) and nitrogen (30 mg/L). In the present study a Vertical Flow (VF) constructed wetland treatment system planted with Arundo donax was employed to achieve the wildlife discharge standards (BOD
5<2 mg/L). Maximum Chemical Oxygen Demand (COD) removal of 68 ? 11% and 77 ? 6.2% was achieved at an organic loading rate of 80 and 120 g COD/m?/day, respectively, and the corresponding Total Kjeldahl Nitrogen (TKN) removal of around 82 ? 4.4 and 86 ? 9% was also achieved, respectively, for the same.