Conversion of waste tires and date stones into char through co-pyrolysis is an effective way to safely remove and recycle these materials. This study tested char as a low-cost adsorbent for removing nitrate and phosphate in fixed-bed systems, offering a way to reuse waste tires and date stones. The effects of inlet pollutant concentration (50, 150, and 300 mg/L), flow rate (5, 10, and 15 ml/min), and bed height (5, 10, and 15 cm) on the adsorption system’s breakthrough were measured. Characteristics of char were analyzed via the Fourier transform of infrared (FTIR), Brunauer-Emmett-Teller (BET), and zeta potential. The fixed-bed analysis demonstrated superior correlation of breakthrough data with both the Yoon-Nelson and Thomas models. Under varying circumstances, the findings agreed with the Yoon-Nelson and Thomas models, as measured by the correlation coefficient R² values (0.8147-0.9913) for phosphate, (0.9187-0.9913) for nitrate, and (0.8146-0.9907) for phosphate, (0.9189-0.9801) for nitrate, respectively. The results demonstrate the potential of the prepared char as an efficient and sustainable adsorbent for nutrient removal in continuous treatment systems, providing a promising approach for wastewater treatment and waste valorization.