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On-site Silver Recovery

There are a variety of on-site silver recovery technologies available. Understanding the size of your operation, amount of effluent, and the silver discharge limit in your local area, will help you to determine the correct technology for your operation.

For small volume users, silver recovery using metallic replacement is recommended. These cartridges are simple to use and maintain. Used cartridges must be sent to a silver refiner for further treatment and recovery of metallic silver.

Electrolytic silver recovery is the most efficient technique for removing silver from silver-rich photographic solutions. The type of electrolytic recovery unit chosen depends on the solutions being treated and the daily volumes requiring treatment. Often, metallic replacement cartridges need to be used tailing electrolytic recovery equipment to ensure compliance with local sewer discharge limits. These units are more costly than simple metallic replacement cartridges and rather more complex to set up and operate effectively.

The removal of silver from wash waters requires still more sophisticated technology such as ion exchange, nanofiltration or reverse osmosis. These techniques are usually only justified in order to meet strict local regulations.

Also, there is the chemical precipitation technique. This technique developed by Kodak is used to produce very low silver concentrations in the effluent going to the sewer. Semi-automatic and customized equipment for automated precipitation are used to facilitate the process.

Whatever the technique used for silver recovery, it can provide an economic benefit and enable compliance with local discharge regulations. If on-site silver recovery is not done, the owner/operator must send silver-rich solutions off site for proper management.

	List of Silver Recovery Equipment Vendors
	Silver Management Publications