Abstract: Disclosed is an apparatus for processing spent photographic wash water, so that it may be recycled for reuse in the washing apparatus involving passing the spent wash water through an oxidation reaction apparatus to convert any thiosulfate salts in the spent wash water to sulfate salts, and then returning the sulfate water to the developing apparatus for reuse as wash water. In the reactor, the thiosulfate salts in the wash water react in the presence of an oxidation catalyst with oxygen from spent drying air passed to the reactor.

Abstract: Disclosed are a method and apparatus for processing spent photographic wash water, so that it may be recycled for reuse in the washing step of a photographic developing process, involving passing the spent wash water through an oxidation reaction apparatus to convert any thiosulfate salts in the spent wash water to sulfate salts, and then returning the sulfate water to the developing process for reuse as wash water. In the reactor, the thiosulfate salts in the wash water react in the presence of an oxidation catalyst with oxygen from spent drying air passed to the reactor.

Abstract: Disclosed is a method and apparatus for automatically replenishing the chemical solutions consumed in a film developing process, which results in a lessening of the chemical activity of the solutions, and where the consumption of some of the chemicals in some of the solutions are dependent on the amount of imagery processed and the rest of the solutions are dependent on the amount of bulk or non-imagery processed. The process generally involves extracting samples of one of the image dependent and one of the bulk dependent solutions, analyzing the samples to determine the chemical activity therein, and replenishing all of the image dependent solutions in relation to the chemical activity in the image dependent sample and all of the bulk dependent solutions in relation to the chemical activity in the bulk dependent sample. Provisions may be made to recycle or regenerate some of the solutions.