Method for the electro-oxidation of photographic solutions
AssigneeEastman Kodak Company
InventorIsabelle Fleury
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Abstract
The invention concerns a method for the treatment by electrolysis of used photographic solutions, in particular those containing developers for X-ray films, in an electrolysis cell comprising at least one platinum anode and at least one cathode. According to the invention, a current density profile is used, and the current density at the start of electrolysis does not exceed 50% of the maximum density of the electrolysis current. The invention enables the quantity of foam formed during electrolysis to be reduced.
Claims8
Method for electro-oxidizing an aqueous solution having a COD higher than 20 g/l comprising used photographic or X-ray developers in a single compartment electrolysis cell comprising at least one platinum anode and at least one cathode, wherein the method comprises electro-oxidizing the aqueous solution at a first current density applied at the start of electrolysis for a time period of from 10% to 20% of the time needed to obtain a COD of 2 g/l, said first current density not exceeding 50% of the maximum density of the electrolysis current applied during electro-oxidation, and then increasing the current density up to the maximum current density.
Dependencies are inferred from the claim text.