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Re: Molybdenum in Hospital Wastewater



Moly has been used as a water treatemnt chemical in cooling towers, they
used to use chromium and have switched  to molybdenum (P2?).  I don't know
if there are other substitute that contain no heavy metals.


At 10:31 AM 3/26/97 -0500, you wrote:
>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 have
>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 evaluation
>of chemicals used (through vendor 
>analysis/certification)as well as working closely with wastewater testing
>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 appreciated.
>
>The facility would like a response by May 1, 1997.
>
>Thanks,
>
>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
>
>
Tim Tuominen
WLSSD
2626 Courtland Street
Duluth, MN   55806

Phone:  218.722.3336 x324
Fax:  218.727.7471
Email: p2team@cp.duluth.mn.us