Applications of electrodialysis for acid pickling wastewater treatment
作者： E Paquay , A.-M Clarinval , A Delvaux , M Degrez , H.D Hurwitz
DOI: 10.1016/S1385-8947(00)00208-4
关键词: Pickling 、 Electroplating 、 Membrane technology 、 Electrochemical cell 、 Electrodialysis 、 Membrane 、 Inorganic chemistry 、 Hydrochloric acid 、 Chemistry 、 Limiting current 、 Chromatography
摘要: Abstract In acid pickling before electroplating, the effective concentration deteriorates while dissolved metal increases continuously. By introducing electrodialysis (ED) between this operation and following rinsing baths, these disadvantages are largely rectified. Recovered is continuously returned to bath amount of waste drastically reduced. Depleted solution reused in baths. Moreover, ED can avoid metallic impurity build-up bath. First manipulations conducted on our laboratory equipment failed. So, ion-exchange membranes (IEMs) were characterized by conductivity measurements polarization curves. Afterwards, a new selection IEMs was performed. Faradic yields calculated for various commercial anion- cation-exchange (AEMs CEMs) Hittorf cell conditions refined. The relation hydrodynamics limiting current density checked based tracer method successfully applied electrochemical cells laboratory.
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