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This study aims to utilize the calcium alginate (Ca-Alg) beads for ammonia and phosphate ions adsorption. The alginate beads were characterized using the scanning electron microscope (SEM) with Energy Dispersive X-Ray (EDX) spectroscopy. The alginate beads showed relatively high removal efficiencies for ammonia ions (94.94%) and phosphate ions (88.31%). For the ammonia ions adsorption, the optimum condition was at the original pH (6.0), alginate beads amount of 5 g/L, ammonia ions concentration of 50 mg/L, and a contact time of 60 min. The optimum conditions for the phosphate adsorption occurred at the original pH, adsorbent amount of 5 g/L, initial concentration of 10 mg/L, and a contact time of 60 min. The adsorptions of ammonia and phosphate ions onto the alginate beads were found to follow Langmuir isotherm and the pseudo-second-order model. The thermodynamic experiments showed …