[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Fluorides, POTW influent, & metal finishing

What is the POTWs effluent concentration?
What is the industries effluent concentration?
Is the POTW passing the limit now:?

Dr. Henry Boyter, Jr. Ph.D. Chemist

The opinions of Dr. Boyter are provided for informational
purposes only and should not be used as advice. No
warranty or expression of professionalism is implied.


----- Original Message -----
From: "MARK STODDARD" <MSTODDAR@dem.state.in.us>
To: <p2tech@great-lakes.net>
Sent: Monday, June 05, 2000 5:14 PM
Subject: Fluorides, POTW influent, & metal finishing


   I am searching for information on materials that are used in industry
that contain fluoride.

   An Indiana POTW will have a fluoride limit (2 mg/L) imposed in its NPDES
permit.  The POTW is concerned that it will not meet the limit due to the
average concentration (~8 mg/L which is two times the MCL of 4 mg/L) of
fluoride in the POTW influent.  Downstream of the POTW discharge is an
intake for another city's drinking water.

   The POTW is aware of one industrial user that etches steel using
Fluoboric acid (Tetrafluoroboric acid).  The POTW would like that user to
explore other chemicals for use as an etchant whereas the industrial user
does not believe its use is contributing to the POTW's problem with

   As part of the Office of Pollution Prevention & Technical Assistance, I
would like to assess other possible sources (contributions from certain
industrial sources, etc.) of fluorides to the POTW influent.  Perhaps there
are industrial sources/uses that would commonly use materials that might
cause a fluoride discharge.  Once I can narrow down the types of fluoride
compounds used and the types of sources using them, I want to find fluoride
subsitutes that could be considered/tested or possible use.

   It would be great not only to help the POTW, but to help the POTW help
their industrial users.

   Thanks for your input in this matter.

Mark C. Stoddard