LAUSR

A two-stage, coagulation-Fenton and coagulation-Fenton’s-like processes were used for the treatment of fish canning wastewater (FCW). Each process was analyzed both individually and in combination with the other one. The coagulation–flocculation–decantation (CFD) process was performed by the application of aluminum sulfate (Al2(SO4)3), poly-aluminum chloride, and ferric chloride (FeCl3). To evaluate the efficiency of organic material removal, advanced oxidation processes such as Fenton and Fenton-like were applied. The CFD processes (pH = 7.2, [Al2(SO4)3] = 400 mg/L, rapid speed 120 rpm/1 min, slow speed 30 rpm/20 min, sedimentation time 10 min, temperature 298 K), and Fenton and Fenton-like processes (pH 3.0, [Fe2+] = [Fe3+] = 400 mg/L, [H2O2] = 400 mg/L, agitation 150 rpm, temperature 298 K, and reaction time 60 min) led to 58%, 68%, and 60% chemical oxygen demand (COD) removals, respectively. The application of a combined two-stage CFDFenton and CFD-Fenton-like process led to COD removals of 93% and 84%, respectively. The BMG model provided the best correlation of the data with an R2 of 0.995 and 0.999 for the Fenton and Fenton-like processes, respectively. Therefore, it could be concluded that it is more advantageous to combine coagulation and Fenton processes for the treatment of FCW.