Date:Fri, 12 Jan 2001 08:43:12 -0500
Small volume CRC's are available and are commonly used in medical offices. The key to a CRC and any other Silver recovery system is to size it to the volume of silver rich solution that is being generated. The rule of thumb for a CRC is that they should sized so they are not on line for more than 6 months before it is changed out. (To avoid channeling) the canister should be filled with water before they are put on line. This avoids the direct introduction of a corrosive material into a "bed" of iron laden material, which is the primary reason for channeling if the system is sized correctly. When we hold CMP workshops we outline that it can be just as cost effective to have the fixer hauled off site, as it is to "manage" a silver recovery system at a facility. Personal experience is that on-site silver recovery for the very small generator is very much a business decision. The facility should factor in the cost of personnel time to manage the system including O & M time for an on-site silver recovery system. They should also realize that at such a small volume they will not break even on the cost of the on-site silver recovery (the rebate from the recovered silver will not off set their capital cost for the system and the O&M cost).