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Molybdenum in Wastewater

A circuit board shop is experiencing molybdenum in its wastewater
discharges to the sanitary sewer.  The discharge is about 0.12 mg/l,
while the local limit is 0.09 mg/l.

Does anyone have any ideas of where the molybdenum source might be?


Thomas Barron, PE
P2 Consultant
3351 Beechwood Drive
Lafayette, CA 94549
(510) 283-8121