This study examines the effectiveness of low-cost adsorbents derived from agricultural waste in removing Rhodamine 6G from simulated dairy effluent and dye wastewater. The dairy industry generates substantial wastewater with a high organic content, while textile dye wastewater poses challenges due to the presence of persistent and toxic-colored compounds. Adsorption was explored using activated carbon, peanut hull, and banana peel. Synthetic wastewater samples mimicking dairy effluent were prepared, and Rhodamine 6G was added. Batch experiments assessed dye removal efficiency under varying conditions, including adsorbent dosage, initial dye concentration, and the presence of organic matter. Transmittance and absorbance measurements quantified Rhodamine 6G concentrations. Activated carbon showed the highest transmittance of 95.93% when treated with activated carbon at its lowest concentration of 20 mg/L and milk wastewater concentration at 50 mg/L. Peanut hull treated Rhodamine 6G at a concentration of 20 mg/L and milk wastewater at 50 mg/L, achieving a transmittance value of 76.03%. At a dye concentration of 20 mg/L and milk wastewater concentration of 50 mg/L, banana peel powder yielded the highest transmittance value of 84.07%. Organic matter in simulated dairy effluent slightly impacted adsorption, likely due to competitive adsorption. However, agricultural waste adsorbents maintained reasonable performance. Agricultural waste materials show potential as low-cost alternatives to activated carbon for dye-containing wastewater treatment. Converting these wastes into effective adsorbents offers an economical and sustainable solution, contributing to a circular economy. Further research should optimize the process, enhance the adsorption capacity of waste adsorbents, and examine their long-term stability and reusability.