A novel CuO–CeO 2 –Co 3 O 4 nanocatalyst loaded on Al 2 O 3 ceramic composite membrane (CCM-S) was synthesized through spraying-calcination method, which can be beneficial to the engineering application of scattered granular catalyst. BET and FESEM-EDX testing revealed that CCM-S possessed a porous character with high BET surface area of 22.4 m2/g and flat modified surface with extremely fine particle aggregation. The CCM-S calcined above 500 °C presented excellent anti-dissolution effect due to the formation of crystals. XPS indicated that the composite nanocatalyst possessed the variable valence states, which were conducive to exert the catalytic effect of Fenton-like reaction. Subsequently, the effects of experimental parameters including fabricate method, calcination temperature, H 2 O 2 dosage, initial pH value, and CCM-S amount were further investigated considering the removal efficiency of Ni(II)-complex and COD after decomplexation and precipitation (pH = 10.5) treatment within 90 min. Under the optimal reaction condition, the residual Ni(II)-complex and Cu(II)-complex concentration from actual wastewater was all lower than 0.18 mg/L and 0.27 mg/L, respectively; meanwhile, the removal efficiency of COD was all higher than 50% in the mixed electroless plating effluent. Besides, the CCM-S could still maintain high catalytic activity after a six-cycle test, and the removal efficiency was slightly declined from 99.82% to 88.11%. These outcomes indicated that CCM-S/H 2 O 2 system was provided with a potential applicability on treatment of real chelated metal wastewater. [Display omitted] • Composite nanocatalysts on ceramic membrane (CCM) was used for decomplexation. • Actual chelated metal wastewater was efficiently treated by the CCM/H 2 O 2 system. • 30.47 mg/L of Ni(II)-complex reduced to 0.18 mg/L by decomplexation-precipitation. • Cu(II)-complex and COD in real effluent could also be removed by this system. • Mechanistic detail for decomplexation of chelated metal by CCM/H 2 O 2 is proposed. [ABSTRACT FROM AUTHOR]