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Photo Processing (COD)

	Recently we received a call from a local POTW, requesting
data/information on photo processing effluent.  Sampling showed high levels
of cod (40,000mg/l) being discharged from the silver recovery unit.  POTW is
concerned about these high levels.  Vendor data shows typical COD
concentrations of 200-2000mg/l - total effluent.  Has anyone conducted
sampling or seen data with similar high numbers?  Suggestions are welcome.
Thanks in advance

Will Howard