title: Efficiency evaluation of the membrane/AOPs for paper mill wastewater treatment.
abstract: The treatment of pulp and paper mill wastewater by combining an ultrafiltration (UF) membrane and advanced oxidation processes (AOPs) was investigated at a bench scale. In the present study, the effects of impressive parameters on membrane fouling such as CaCl2(mg/L), pH, and temperature (°C) were studied using response surface methodology (RSM). According to the results yielded, at the temperature of 45°C, pH of 10 and CaCl2concentration of 400 mg/L, the fouling reached its minimum (32%). Therefore, scanning electron microscopy (SEM) analyses showed that the average thickness of cake layer on the UF surface decreased from approximately 75.37 µm to 11.38 µm by optimizing the operating conditions. The results showed the UF permeate quality is not sufficient. Thus, AOPs applied for permeate. In this way, the performance of sulfate and hydroxyl radicals, generated by the activation of oxidants, such as persulfate ([Formula: see text]) and H2O2, by Fe(II) for removal efficiencies was examined. Accordingly, under the optimum conditions of Filtration/Fenton ([H2O2] = 15 mM, [Fe(II)] = 6 mM, pH = 3), the removal efficiency of chemical oxygen demand (COD), UV254, and UV280was 95.02%, 86.74%, and 87.08%, respectively. This is while, in the optimum conditions of Filtration/[Formula: see text]/Fe(II) ([[Formula: see text]] = 7 mM, [Fe(II)] = 2 mM and pH = 6), the removal efficiency of COD, UV254, and UV280reached 94.96%, 92.04%, and 90.16%, respectively. This is indicative of the fact that the process of Filtration/[Formula: see text]/Fe(II), with a lower oxidant and catalyst concentration and pH close to the neutral range is more efficient than that of Filtration/Fenton.
authors.affiliation: a Department of Chemical Engineering, Faculty of Engineering , University of Guilan , Rasht , Iran.
authors.forename: Moeen
authors.initials: M
authors.lastname: Gholami
authors.affiliation: a Department of Chemical Engineering, Faculty of Engineering , University of Guilan , Rasht , Iran.
authors.forename: Behrooz
authors.initials: B
authors.lastname: Abbasi Souraki
authors.affiliation: b Department of Environmental Science, Faculty of Natural Resources , University of Guilan , Rasht , Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Pendashteh
authors.affiliation: c Environmental Research Institute, Academic Center for Education , Culture and Research (ACECR) , Rasht , Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Bagherian Marzouni
mesh_terms: D057219:Biofouling; D057919:Biological Oxygen Demand Analysis; D006841:Hydrocarbons, Aromatic / Q000032:analysis; D006861:Hydrogen Peroxide / Q000032:analysis; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron / Q000032:analysis; D008031:Lignin / Q000032:analysis; D010084:Oxidation-Reduction; D010209:Paper; D013431:Sulfates / Q000032:analysis; D014462:Ultrafiltration; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006841:Hydrocarbons, Aromatic; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D007501:Iron; D008031:Lignin; D013431:Sulfates; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Filtration; advanced oxidation; hydroxyl radicals; membrane fouling; sulfate radicals