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RE: latex in wastewater

Has the manufacturing company tried any P2 methods to reduce/eliminate the
excess latex?  Without knowing the process a couple of items come to mind; 
	1) reducing the amount of latex applied so there is less/no excess, 
	2) Improving the application method to generate less/no excess,
	3) removing what excess there is with minimal water and reusing the
water in the makeup of the next latex coating mix.

Once the latex waste has been minimized then you can determine (with the
POTW) if the waste stream needs to be pretreated.  If it does you can work
with water treating companies such as Nalco, Betz, Culligan, etc. to get an
additive mix which will let the latex settle out.  Micro and ultrafiltration
is probably another good technology although I don't have direct experience
with it.

Sounds like an interesting challenge.  Good luck.

Dale H. Francke
Pratt & Whitney   M/S 717-03
P.O. Box 109600
W. Palm Beach,  FL  33410-9600
e-mail:   frncked@pwfl.com
561.796.3733   FAX  561.796.2787

> ----------
> From: 	Greg Newman[SMTP:Greg_Newman@p2pays.org]
> Sent: 	Thursday, September 30, 1999 5:07 PM
> To: 	P2Tech (E-mail); 'sewer-list@mcfeeley.cc.utexas.edu'
> Subject: 	latex in wastewater
> Everyone
> I recently received a call from a POTW who is trying to determine
> pretreatment permit limits for a company applying a latex coated fabric to
> a
> foam backing.  The excess latex is washed off the fabric and ends up in
> the
> discharge.  The POTW has experienced some problems with blockages in the
> past but not recently.  The effluent is also extremely high in BOD / COD.
> Presently the company only discharges about 2000 gpd but they plan a
> future
> expansion and thus the POTW is trying to assess what limits, pretreatment
> equipment, and waste management practices should be imposed / required.
> Does anyone have experience in: permitting a similar company, the  types
> of
> limits imposed, types of operational practices required, experience with
> blockages or other problems.
> I am aware of some companies who have used a clarifier with a filter press
> to treat this type of waste stream.
> Thanks in advance
> Greg
> Greg Newman
> NC Div. of Pollution Prevention & Environmental Assistance
> 1639 Mail Service Center
> Raleigh  NC 27699-1639
> Ph: (919) 715-6515  Fax: (919) 715-6794
> Web: www.p2pays.org

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