NC0003875_correspondence_20050908

Re: Elementis Chromium ? New Hanover County, Castle Hayne, NC...
Subject: Re: Elementis Chromium ? New Hanover County, Castle Hayne, NC NPDES Permit No.
NC0003875
From: Tom Belnick <[e-mail]>
Date: Thu, 08 Sep 2005 16:52:03 -0400
To: [e-mail]
CC: Ed Beck <[e-mail]>
You do not need a permit mod to switch to hydrochloric acid for pH control, since the
discharge from Outfall 001 already includes effluent limits for pH and chronic
toxicity.
[e-mail] wrote:
Subject: Elementis Chromium - New Hanover County, Castle Hayne, NC
NPDES Permit No. NC0003875
Elementis Chromium intends to utilize hydrochloric acid in our wastewater
treatment process for pH control. The purpose of this e-mail is to request
confirmation that the proposed change to use hydrochloric acid can be made without
revising our NPDES Permit No. NC0003875.
Currently the wastewater treatment process utilizes sulfuric acid, sulfur dioxide,
and pickle liquor to reduce hexavalent chromium to trivalent chromium in the
treatment process. The pickle liquor we use originates from the steel industry in
the form of ferrous chloride and spent hydrochloric acid. Using hydrochloricacid
for pH control will enhance the effectiveness of sulfur dioxide as a reducing
agent and will not affect our ability to meet all conditions of the current
permit. It is anticipated that this change should also help better control total
dissolved solids in the treatment process.
We would like the flexibility to use sulfuric acid, hydrochloric acid, pickle
liquor, or combination of these acids for pH control. Hydrochloric acid will be
introduced into the system using existing process equipment. Elementis Chromium
respectfully requests concurrence that the above proposed change can be completed
without a permit modification.
If you have any questions or need further information, please contact Bob
Hollinger at [phone] or myself at [phone].
Sincerely,
Richard Lowrey
Manager of Health, Safety and Environment
Elementis Chromium, LP
Tom Belnick <tom.belnick a,ncmail.net>
Environmental Specialist III
NC Division of Water Quality
Point Source Branch
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