Most remnants of photographic processing solutions are biodegradable and are successfully processed by biological treatment systems with aerobic (oxygen present) processes – typically found in municipal sewage systems. Most municipalities establish an allocated limit on discharge of certain materials. You may want to check your local guidelines before disposal. The byproducts cannot however be processed by anaerobic (oxygen absent) biological treatment systems found in septic systems. It is recommended that you find an off-site disposal facility if your locality is backed by a septic system.
The reference cited (Kodak.com) indicates that harmful by-products are created and should be disposed of according to EPA and local regulations if they are produced in quantities subject to Clean Water Act limits.
Photo processors that deal with a large volume of film have found it profitable to recover SILVER from their processing waste.
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