Dye and chemical oxygen demand removal from textile wastewater using a scoria-based horizontal subsurface flow constructed wetland planted with Chrysopogon zizanioides
Year: 2025
Type: article
Abstract: The textile industry drives economic growth but faces environmental challenges due to high wastewater generation. Therefore, this study was conducted with the objective of removing chemical oxygen demand (COD) and dye from textile industrial wastewater using a horizontal subsurface flow constructed wetland. The constructed wetland was developed using scoria as a filter medium and was planted with vetiver grass to enhance pollutant removal. The wetland operated with a hydraulic retention time of 5 days and an average flow rate of 0.021m³/day. The wastewater was characterized for various physicochemical parameters, including pH, temperature, COD, dissolved oxygen (DO), biochemical oxygen demand (BOD), Total nitrogen (TN), Total phosphorus(TP), dye concentration, and electrical conductivity, revealing a significant pollutant load. Before treatment, the COD and dye concentrations of wastewater from the Ketema Kebede (KK) textile industry were determined to be 995.1 mg/L ± 14.85 and 377.63 mg/L ± 34.71, respectively. After treatment, the planted constructed wetland achieved COD and dye removal efficiencies of 94.32 ± 0.96 and 95.42 ±1.37, respectively. Meanwhile, the unplanted constructed wetland achieved COD and dye removal efficiencies of 88.11 ± 1.02 and 90.95 ±1.20, respectively. Overall, this study demonstrated that a scoria-based horizontal subsurface flow constructed wetland planted with vetiver grass exhibits promising COD and dye removal efficiency, highlighting its potential application for large-scale industrial textile wastewater treatment.
Source: Results in Engineering
Language: English
Subfield: Waste Management and Disposal
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,940
OpenAlex ID: W4415348083