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[Fwd: RE: Graffiti Removal]

While water-based cleaning methods involve substantially reduced
hazards, the wastewater still can pose a significant impact to surface
waters and thus is typically illegal to discharge to a storm drain
(except in very narrow circumstances where nothing but water is used, no
material other than surface dirt is being removed).  Relatively simple
methods exist to collect wastewater from cleaning operations for
treatment or sewer disposal (assuming it meets local discharge limits).

Kelly Moran
TDC Environmental

-------- Original Message --------
Subject: RE: Graffiti Removal
Date: Tue, 24 Aug 1999 09:07:44 -0400
From: "Francke, Dale H." <frncked@pwfl.com>
Reply-To: "Francke, Dale H." <frncked@pwfl.com>
To: p2tech@great-lakes.net, "'Bill Green'" <BGreen@ecolink.com>

Have you looked into the use of a water jet, high pressure water.  This
being used in the aerospace industry to remove paint from aircraft skin,
aluminum sheet metal, and coatings from turbine blades.  It is also used
NASA to remove paint from insulating material on the space shuttle and
boosters and also for removing the insulation without damage to the
skin.  With the right conditions (pressure, angle of application, dwell
time, etc.) this might work.

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: 	Bill Green[SMTP:BGreen@ecolink.com]
> Sent: 	Monday, August 16, 1999 8:48 AM
> To: 	p2tech@great-lakes.net
> Subject: 	Graffiti Removal
> Looking for case studies of technology to remove paint and marker
> graffiti from both sealed and unsealed brick/concrete as well as metal
> surfaces.  Client in this case has been though methylene chloride (of
> course) and NMP based solvents.  Now using soda blast which is causing
> some surface damage such as grout removal. What have you seen out
> there??
> Bill Green
> bgreen@ecolink.com
> 770-621-8240