Mise en oeuvre d'une meilleure technique disponible (II)

info:eu-repo/semantics/publishe

Mise en oeuvre d'une meilleure technique disponible (I)

info:eu-repo/semantics/publishe

Recycling by electrodialysis: From lab to industrial applications

The purpose of this paper is to describe an experimental method developed to study the use of electrodialysis (ED) as a recycling process introduced within some operations in the surface treatment industry. The case study is acid picking before electroplating. The first step is the study and selection of ion-exchange membrane couples. The second step is the development of tools to promote the use of ED applied to industry. Tracer methods and surface treatment models are described.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Les techniques membranaires :une solution pour les effluents des ateliers de traitements de surface

info:eu-repo/semantics/publishe

Applications of electrodialysis for acid pickling wastewater treatment

In acid pickling before electroplating, the effective acid concentration deteriorates while the dissolved metal concentration increases continuously. By introducing electrodialysis (ED) between this operation and the following rinsing baths, these disadvantages are largely rectified. Recovered acid is continuously returned to the pickling bath and the amount of waste is drastically reduced. Depleted solution is reused in rinsing baths. Moreover, ED can avoid metallic impurity build-up in the acid pickling bath. First manipulations conducted on our laboratory equipment failed. So, ion-exchange membranes (IEMs) were characterized by conductivity measurements and polarization curves. Afterwards, a new selection of IEMs was performed. Faradic yields were calculated for various commercial anion- and cation-exchange membranes (AEMs and CEMs) in a Hittorf cell and ED conditions were refined. The relation between the hydrodynamics of ED and the limiting current density was checked by new measurements based on a tracer method successfully applied to electrochemical cells by our laboratory. (C) 2000 Elsevier Science S.A. All rights reserved.SCOPUS: cp.jinfo:eu-repo/semantics/publishe