"Matz, Tim" <tmatz@htcnam.com> 
03/03/2009 10:10 AM	To
	Keith Barnett/RTP/USEPA/US@EPA, "meg.garakani@holcim.com" 
<meg.garakani@holcim.com>, "Joel.Bolduc@holcim.com" 
<Joel.Bolduc@holcim.com>, "HECTOR.YBANEZ@holcim.com" 
<HECTOR.YBANEZ@holcim.com>, "ngarnett@txi.com" <ngarnett@txi.com>
	cc
	Susan Thorneloe/RTP/USEPA/US@EPA, Michael Laney <mnl@rti.org>, 
"marvin@rti.org" <marvin@rti.org>
	bcc
	
	Subject
	RE: Wet scrubber water treatment
	
	
	History:	
		This message has been forwarded.

Keith,

Lehigh's Mason City plant's wet scrubber is a closed loop water system.  
The scrubber blowdown is sent to a dewatering system where the gypsum is 
recovered, stored and used in the finish mills. The plant still needs to 
purchase gypsum as the scrubber system does not provide enough for 
operations. The water from the dewatering system is then sent directly 
back to the scrubber with no further treatment. No liquid waste stream 
leaves the process.


Timothy L. Matz
Corporate Director of Environmental Affairs

Lehigh Hanson
8505 Freeport Parkway
Irving, Texas 75063
phone: (469) 417-1361
cell: (610) 554-8942
fax: (469) 417-1479
tmatz@htcnam.com 

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-----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; Matz, Tim; ngarnett@txi.com
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

