Reclamation of forward osmosis reject water containing hexavalent chromium via coupled electrochemical-physical processes
Year: 2022
Type: article
Abstract: 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 cm−2). In addition, operating costs of 0.014 USD m−3, electrical energy consumption of 0.005 kWh m−3, and settled sludge volume of 445 mL L−1 were obtained.
Source: Environmental Technology
Institutions: Qazvin University of Medical Sciences, Istanbul Technical University, Universidad de Santiago de Chile, Universidad de Guanajuato, Université Ibn Zohr, Sharif University of Technology, Egypt-Japan University of Science and Technology, Alexandria University, Universidade Federal do Rio Grande do Norte, Centre National de la Recherche Scientifique, Aix-Marseille Université, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, Centre de Recherche et d’Enseignement de Géosciences de l’Environnement, Institut de Recherche pour le Développement
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4297989746