Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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Dye wastewater treated by vertical-flow constructed wetlands
Amjad Hussein, Miklas Scholz

Last modified: 2015-10-10

Abstract


Wetlands have long played a significant role as a natural purification system. Textile industry processes are among the most environmentally unsustainable industrial processes, because they produce coloured effluents in large quantities polluting water resources. In this study, two different azo dyes, Acid Blue 113 (AB113) and Basic Red 46 (BR46) have been fed to laboratory-scale vertical-flow construction wetland set-up, comprising wetlands with gravel media as controls and wetlands planted with common reed for each dye. Two different concentrations (5 mg/l and 200 mg/l) were used for each dye at two different hydraulic retention times (48 h and 96 h). For the low concentration of BR46, there is no significant difference between wetlands in terms of dye removal. However, for chemical oxygen demand (COD), the removal percentages were 78%, 89% and 91% for the control and for the wetlands with short and long retention time, respectively. For the high concentration of BR46, the removal percentages for the dyes were 95% and 79%, and for COD, they were 91% and 78% for the long and short retention times, respectively. For the low concentration of AB113, the percentage removals for the dye were 59%, 62% and 82%, and for COD, they were 23%, 55% and 61% for the control, and the short and long retention times, respectively. Finally, for the high concentration of AB113, the percentage removals for the dye were 82% and 78%, and for COD, they were 71% and 64% for the 48 h and 96 h retention times, respectively.