Dye wastewater containing heavy metal ions is a common industrial effluent with complex physicochemical properties.The treatment of metal-dye binary wastewater is difficult.In this work,a novel in-situ ferrite process (IFP) was applied to treat Methylene Blue (MB)-Cu(Ⅱ) binary wastewater,and the operational parameters were optimized for MB removal.Results showed that the optimum operating conditions were OH/M of 1.72,Cu2+/Fe2+ ratio of 1/2.5,reaction time of 90 min,aeration intensity of 320 mL/min,and reaction temperature of 40℃.Moreover,the presence of Ca2+ and Mg2+ moderately influenced the MB removal.Physical characterization results indicated that the precipitates yielded in IFP presented high surface area (23230 m2/g) and a multi-porous structure.Based on the Langmuir model,the maximum adsorption capacity toward MB was 347.82 mg/g for the precipitates produced in IFP,which outperformed most other adsorbents.Furthermore,IFP rapidly sequestered MB with removal efficiency 5 to 10 times greater than that by general ferrite adsorption,which suggested a strong enhancement of MB removal by IFP.The MB removal process by IFP showed two different high removal stages,each with a corresponding removal mechanism.In the first brief stage (＜5 min),the initial high MB removal (～95％) was achieved by predominantly electrostatic interactions.Then the sweep effect and encapsulation were dominant in the second longer stage.