Silver Management Program
The goal of Boulder's silver reduction program is to reduce the amount of silver entering the city's wastewater treatment facility. Boulder's 75th Street Wastewater Treatment Facility is unable to treat or remove metals such as silver. Treated wastewater is discharged to Boulder Creek while solids that settle out during the treatment process are applied to agricultural land as a soil amender.
The primary source of silver is from the discharge of untreated or improperly treated silver-bearing fixer from photographic material processing such as development of silver bearing film, x-ray film and photographic paper.
Several local vendors offer fixer pick-up services. If your practice generates only small quantities of fixer, it may be more cost-effective and efficient to have the fixer transported off-site for silver removal. By opting for off-site disposal, you are guaranteed 100 percent recovery of silver in x-ray fixer.
When storing fixer for off-site treatement or disposal, remember to:
You can purchase or lease a silver recovery unit to remove silver from spent fixer. Canister units are usually sufficient for removing silver from small volumes of fixer and can be used alone or in series. Electrolytic units are also available and can be followed by a canister to ensure as much silver as possible is recovered. Talk with a silver recovery service about what will work best for your practice. After a specified interval, the canister of ther plated silver is shipped to a metal reclaimer where the captured silver is recovered. The treated fixer can be discharged to the drain with permission from the City of Boulder Industrial Pretreatment Program, 303-413-7350.
If your office uses a silver recovery unit, remember to:
Last Updated on Thursday, 04 October 2012 11:27