"Garnett, Nancy" <ngarnett@txi.com> 
03/02/2009 02:28 PM	To
	Keith Barnett/RTP/USEPA/US@EPA
	cc
	Susan Thorneloe/RTP/USEPA/US@EPA, "Michael Laney" <mnl@rti.org>, 
<marvin@rti.org>
	bcc
	
	Subject
	RE: Wet scrubber water treatment
	
	
	History:	
		This message has been replied to.

Keith,
At TXI Midlothian - the water from the dewatering system is returned to
the wet scrubber.  It is not treated.
The liquid that is purged from the scrubber system is not treated
either.  It is used to pug the alkali bypass dust or it can be used to
control dust in the quarry ABD storage area.  
Nancy


-----Original Message-----
From: Barnett.Keith@epamail.epa.gov
[mailto:Barnett.Keith@epamail.epa.gov] 
Sent: Monday, March 02, 2009 11:53 AM
To: meg.garakani@holcim.com; Joel.Bolduc@holcim.com;
HECTOR.YBANEZ@holcim.com; tmatz@htcnam.com; Garnett, Nancy
Cc: Thorneloe.Susan@epamail.epa.gov; Michael Laney; marvin@rti.org
Subject: Wet scrubber water treatment


To All:

A question has come up about treatment of water from kilns that use wet
scrubbers for SO2 control.  In our analysis we assume that the scrubber
blow-down is sent to a dewatering facility where the gypsum is dewatered
and stored prior to being sent to the finish mill.  The water from the
dewatering step is assumed to be sent back to the wet scrubber.

Is there some type of water treatment process that takes place after the
solids are removed from the scrubber blowdown? Or is the water simply
sent directly back to the scrubber?  Is there any liquid waste stream
that leaves the scrubber process?  If so, how is this stream treated and
where does it go?


Keith W. Barnett
USEPA/OAQPS/SPPD/MMG
Mail Code D243-02
Research Triangle Park, NC  27711
919-541-5605
barnett.keith@epa.gov


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