Abstract: A process is provided for treating at least one metal in solution in an effluent that includes a step of adding and mixing a mineral or organic reducing composition into the solution comprising the metal, followed by a step of activating the reduction of the metal and neutralizing the effluent by controlled addition of a neutralization solution-based composition. The method also includes a step of precipitating the metal, and a step of recovering the precipitated metal and separating the precipitated metal from the neutralized effluent by filtration of the reduction reaction mixture.

Abstract: A method for separating metal ions absorbed on a resin includes: suspending or percolating a cationic exchange resin charged with a polar solvent containing an eluting agent or a mixture of eluting agents containing at least an organic or mineral ligand complexing the metal ions to be separated; circulating a direct electric current, whether constant or not, in the charged eluting solution forming an electrolyte so as to recuperate at least a metal by deposition; and finally optionally repeating the last step by setting up one or several cathode(s) made of another metal and by re-adjusting the cathode potential and the anode/cathode potential difference to new values, depending on the new type of metal to be recuperated. An installation for treating/recycling photographic bath waste includes an exchanger connected to a tank for waste bath to be treated, to a treated waste bath tank, to a regenerating solution tank and to an electrolysis vessel.