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  Salt Recovery from Reverse Osmosis Concentrate Using Electrodialysis (Poster)  
Diupload oleh : Arseto Yekti Bagastyo, S.T., M.T.
Pengarang : Iman Dimassetya Yanuar Yusuf, Sahat Ricky Pranata Ompusunggu, Arseto Yekti Bagastyo
Tahun : 2015
Dipublikasikan di : The 5th Environmental Technology and Management Conference “Green Technology towards Sustainable Environment”, 23-24 November 2015, Bandung
Jenis Jurnal : International Conference
Eksternal Link : http://
Bidang Penelitian : Electrodialysis
Abstrak : Reverse osmosis (RO) concentrate contains high salinity that may pose adverse effects on marine ecosystems. Electrodialysis is one of alternative treatment methods for RO concentrate. Salt is potentially recovered due to high salinity in the solution. The effect of current density, anode material and flow rate towards salt recovery and chlorine gas production was investigated. This study was conducted in laboratory scale with batch system using concentrates from seawater RO system. The system consists of a feed tank and a three-compartment electrodialysis unit (i.e., anode, cathode, and recovery product compartment). Cathode was made of stainless steel, while anode was made of custom-made Ag and readily-available Pt. Pt used in this study was a recycled medical fracture metal. A portable DC power supply was used to constantly control the specific current value. Parameters monitored in this study include salinity, chloride, total chlorine, pH, and voltage. The highest salinity removal efficiency at current density 2.5 mA/cm2 was 9.05%, while the lowest at 1 mA/cm2 was 1.53%. Reversely, Ag anode resulted in higher removal of salinity. Moreover, electrode material and flow rate variation insignificantly affect salinity removal efficiency. The highest salt recovery was 15%, achieved at current density of 2.5 mA/cm2 using Pt, similar to the Ag anode (i.e., 15.4%) at the same current density. The result has shown that electrodialysis can be an effective method for salt recovery. Anode material and flowrate selection was an important factor to optimize the process, including conversion of chloride into chlorine.
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