Discharging of the toxic effluents from various industries has harmful effects on water resources, soil fertility, aquatic organisms, and the integrity of ecosystems. Among all the treatment methods to eliminate pollutants from wastewaters, adsorption process is one of the most effective methods for removal dye contaminants from wastewater. In the present Fe 3 O 4 nanoparticles were encapsulated in the alginate beads and were used as adsorbent to remove methylene blue from an aqueous solution under influence of a rotating magnetic field. The achieve a better understanding about the effects of implementing the magnetic field on the performance adsorption process, the experiments were conducted at different levels of field strength and field rotation speed. The adsorption experiments were performed in two modes of batch and continuous, and UV-visible spectrophotometry was used for determination of dye concentration in the solution. Also, the kinetics and isotherms studies were performed in the batch mode. The effects of four parameters including initial dye concentration, adsorbent dosage, magnetic field magnitude, weight fraction of iron oxide nanoparticles used in adsorbent beads, and magnetic field rotation speed on the dye removal efficiency were investigated. The experiments were designed by employing the Taguchi experiment design method which gave an orthogonal L16 array of experiments. All the experiments were conducted at 25 o C for 180 minutes and solution pH of 11. The optimal conditions of experiments were predicted by the Taguchi method, which were initial dye concentration: 20ppm, adsorbent dosage in dry basis: 1g, magnetic field strength: 8000gauss, nanoparticles content of in beads: 1 g, and magnetic field rotation speed: 230 rpm. The dye removal of 80.65 % obtained from the confirmatory experiment at the optimal conditions was in good agreement with the prediction by the Taguchi analysis which was 82.9%. After determining the optimal conditions, an experiment was performed in continuous mode at the optimal points of the batch experiments. For this experiment the mean dye removal was 85.38%. The equilibrium time of dye adsorption in in the batch mode experiments was 90 minutes, and experimental kinetic data were best modeled by the pseudo-first-order kinetic model rather than pseudo-second-order and intra-particle diffusion models. Also, isotherm studies showed that the experimental data were more consistent with the Friendlich isotherm model, and dye adsorption onto adsorbent was physisorption and exothermic. Finally, the maximum value of adsorption capacity at ambient temperature (298K) was calculated 169.49mg /g.