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RE: Molybdenum in Hospital Wastewater

Do you know the specific type of moly present ?  Cooling tower treatment
would be the most likely source.  Other sources include lubricants (moly
disulfide) and non-chromated primers.  These sources would tend to show
up on a non routine basis, when someone washed off a piece of equipment
or cleaned up some painting equipment.  Since moly is generally
considered to be non-toxic (hence its use to replace chromium in cooling
towers), why are you faced with meeting a 50 ppb limit ?


From: Jeff Lewis
To: p2tech@great-lakes.net
Subject: Molybdenum in Hospital Wastewater
Date: Wednesday, March 26, 1997 7:31AM

Our office is working with a community hospital to identify and source
reduce molybdenum concentrations in a
wastewater discharge.  Molybdenum levels in the wastewater discharge
risen as high as 2000-3000 ug/l.
Permitted discharge level (local limit) is 50 ug/l.

Steps taken by the hospital have included a MSDS review of hosptial-wide
chemicals as well as an analysis of
incoming city water supply.  The hospital reports no recent changes in
operating practices/processes/activities
or in raw materials used. Other steps taken may include further
of chemicals used (through vendor
analysis/certification)as well as working closely with wastewater
lab(s) to confirm test
results, validate proper QA/QC and identify possible interferences.

We are looking for information or experiences concerning molybdenum
contribution from
potential sources in a hospital/medical care setting.  In addition, any
evidence or information concerning the
mysterious generation or formation of molybdenum in wastewater is

The facility would like a response by May 1, 1997.


Jeff Lewis
Ohio EPA/Office of Pollution Prevention
P.O. Box 1049
Columbus, Ohio 43216-1049
phone: (614) 644-2812    fax: (614) 728-1245
email: jeff_lewis@central.epa.ohio.gov