Constructed wetlands with Phragmites australis plants were used to treat wastewater containing a dye called Acid Orange 7. The plants showed signs of stress at first but adapted over time. The presence of the plants and artificial aeration helped remove organic matter, the dye, aromatic compounds, and ammonia from the water. The aerated wetland had higher removal efficiencies for COD and NH4-N compared to the non-aerated wetland. Both wetlands effectively removed the dye, but the aerated one performed better at removing aromatic compounds.