The objective of this research was to study the feasibility of reactive dye removal in waste water by using horizontal subsurface flow constructed wetland planted with Typha Angustifolia in gravel bed. This research investigated the influence of ratio of reactive dye to carbon source, retention time and plant growing pattern. Ratio of reactive dye to carbon source in the form of COD was varied at 1:0 1:5 and 1:10. Retention time was varied at 3,5 and 7 days while plant growing pattern was varied at half unit and full unit. In addition, the research studied the removal efficiency of dye at optimum for real application to treat wastewater from Textile Dye Industry. The results revealed that, the optimal removal efficiencies of dye and COD in synthetic waste water which was prepared at concentration of 100 mg/l. red reactive dye were achieved at 82% and 83%, respectively at dye to sucrose ratio at 1:5 and retention time at 5 day. In addition removal efficiencies of BOD and TKN were achieved at 99% and 89%, respectively. The result showed that removal efficiency of dye slightly increased when the ratio of dye to nutrient and retention time increased too. The result from treating real wastewater from textile factory showed that removal efficiencies of dye , COD and TKN were achieved at 61%, 65% and 72%, respectively.
