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FW: latex in wastewater

Thanks to everyone for their responses.  Information was very useful.  FYI -
Summary of responses below.  Thanks Greg

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: make sure the latex does not contain mercury compounds ( such as
mecuric sulfate used for its preservative/antibacterial properties).  That
could cause them dissolved Hg problems.  The clarifier/press configuration
is what I've heard of too.

This could be similar to permitting a discharge from water-curtain paint
spray booths, which may add polymer to settle captured paint solids.

"As a man begins to live more seriously within, he begins to live more
simply without."  
--Ralph Waldo Emerson

Judy Kennedy
Washington State Dept. of Ecology ( <http://www.wa.gov/ecology>
P.O. Box 47600
Olympia, WA  98504-7600
Phone (360) 407-6744
FAX (360) 407-6715
Email:   <mailto:jken461@ecy.wa.gov> jken461@ecy.wa.gov

A few years ago, under the aegis of the NICE 3 program, PPG, hardly a small
company, but nonetheless working with similar kinds of waste streams, used
reverse osmosis/UF to recover rinse water from a similar paint-laden rinse
stream.   This case is useful primarily because it's been written up fairly
well; you can get background info from

I suspect a lot can be done w/ process debugging as well, but would have a
hard time making many suggestions without seeing the actual facility.
Hopefully the PPG case will provide some inspiration.

Hope this helps.  

Scott Butner ( <mailto:butner@battelle.org> butner@battelle.org) 
Senior Research Scientist, Environmental Technology Division
Pacific Northwest National Laboratory
4500 Sandpoint Way, Seattle WA   98105
(206)-528-3290 voice/(206)-528-3552 fax
 <http://www.chemalliance.org/> http://www.chemalliance.org/


Superba Print Works in Mooresville does latex backing along with dyeing and
printing.  Bob Brown at Superba can tell you about the system they use to
treat it. 704-664-2084.  Just tell him you work with p2 and John Burke had
worked with him on a cyanide issue.
John Burke

Check the pretreatment standards for Carpet industry development document.
Probably in the EPA or DNR library
Dave Russell, PE

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:    <mailto:frncked@pwfl.com> frncked@pwfl.com
561.796.3733   FAX  561.796.2787

Dear Mr. Newman:

I am a senior process engineering specialist with AquaSource with 25 years
of experience in the planning and design of treatment facilities including
several industrial treatment systems treating high strength wastewater.

A minimum pretreatment faclility would consist of a small solids contact
clarifier. Chemical feeds to the flocculating chamber of the clarifier would
include alumininum sulfate or ferric clarified.  Waste sludges should be
dewatered using a belt filter press or small centrifuge.  This type of
system is reliable for 80 percent TSS removal and 60 percent soluble BOD5
removal.  If higher removal efficiencies are desirable the clarifier can be
followed by an activated sludge process and filtration.

My company offers design, construction, and operations services for
facilities such and this and would like to prepare a proposal for your

James B. Flood, PE
Chief Process Engineer
AquaSource Inc.
12570 E. 39th Ave.
Denver, Colorado 80239-3421
Phone: (303)307-3210
Fax: (303) 307-3201
Email:  <mailto:jflood@aquasource.com> jflood@aquasource.com

here was recently an incident in Louisville where latex based globs formed
in the sewer lines from the local DuPont plant. You might want to contact
the Industrial Waste Division (or Pretreament Division, Louisville-
Jefferson County Metopolitan Sewer District, 502/540-6000.  I would suggest
that you ask specifically for Patrick Fitzgerald. You might also contact the
DuPont plant in Louisville. I do not have a specific name for you, but the
general phone number is 502/569-3232 and ask for the environmental
Please let me know if this works. If not I can try to get specific
information for you.