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Although promising, in many applications electrocoagulation (EC) is not adequate for decreasing pollutants to permissible levels for discharge. In this study, treatment of industrial wastewater from a textile dyeing plant was investigated by a combined process of aerated EC, followed by the use of γ-F e 2 O 3 (Maghemite) nanoparticle adsorbents. The properties of the synthesized nanoparticles were determined by XRD, SEM and FTIR analyses. The effect of aeration rate (0–2.65 L/min), nanoparticle concentration (0–480 mg/L) and initial pH EC (3–7), were investigated on COD removal of the sequential process and a quadratic model (p-value< 0.0001 and R2> 0.98) was developed. Then, under two scenarios, optimization was performed. In the first scenario, the highest COD removal was targeted irrespective of energy or chemical use. Under the second scenario, energy and chemical use were considered as well …