Reclamation of forward osmosis reject water containing hexavalent chromium via coupled electrochemical-physical processes
2022
Mousazadeh, Milad | Naghdali, Zohreh | Kabdaşlı, Işık | Sandoval, Miguel, A | Titchou, Fatima, Ezzahra | Malekdar, Farideh | Nasr, Mahmoud | Martínez-Huitle, Carlos, A | Lichtfouse, Eric | Emamjomeh, Mohammad, Mahdi | Qazvin University of Medical Sciences | Istanbul Technical University (ITÜ) | Universidad de Santiago de Chile [Santiago] (USACH) | Ibn Zohr University of Agadir (UIZ) | Sharif University of Technology [Tehran] (SUT) | Egypt-Japan University of Science and Technology [Alexandrie] (E-JUST) | Federal University of Rio Grande do Norte | Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Xi'an Jiaotong University (Xjtu)
International audience
显示更多 [+] 显示较少 [-]英语. Forward osmosis is a water separation process that uses the natural energy of osmotic pressure to separate water from dissolved solutes through a semipermeable membrane. One of the major challenges using this process is the rejection water which contains high content of pollutants, hindering its practical application. Herein, for the first time, this work introduces a coupled electrochemical-physical process including iron electrocoagulation/filtration/sedimentation as a cost-effective treatment to the forward osmosis reject water containing hexavalent chromium to be reclaimed. The synergistic treatment was optimized through a central composite design and response surface methodology to enhance hexavalent Cr removal and minimize operating costs, electrical energy consumption, and settled sludge volume. A 90.0% chromium removal was achieved under optimized conditions: electrolysis time of 59.7 min and current of 1.24 A (J = 6.32 mA/cm2). In addition, operating costs of 0.014 USD/m3, electrical energy consumption of 0.005 kWh/m3, and settled sludge volume of 445 mL/L were obtained.
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