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small volume silver bath recovery

I am looking for information on means of recovering silver from a silver
plating bath.  The challenge in finding a means of recovery is the small
volume generated by the facility.  They only generate between 12 & 15
gallons of spent bath annually at a rate of about a gallon a month.  The
initial bath composition is 168 grams of potassium cyanide, 89.7 grams of
silver cyanide, and 134.4 grams of potassium carbonate all added to 3000 ml
of DI water.

Any thoughts are well appreciated.

Andy Bray
Northeast Waste Management Officials' Association (NEWMOA)
129 Portland Street, Sixth Floor
Boston, MA 02114
617-367-8558 ext. 306