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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
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
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
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.
Ohio EPA/Office of Pollution Prevention
P.O. Box 1049
Columbus, Ohio 43216-1049
phone: (614) 644-2812 fax: (614) 728-1245