🚀 go-pugleaf

rabii@netcom.com (Richard A. Boyd II) writes:


>I am looking for any information concerning the following subjects:

>1.  Manufacturers of waste water evaporation equipment used specifically
>in the dry cleaning industry.

>2.  Any technical data concerning the effectiveness of various types of
>carbon (for the adsorption of perchloroethylene) used in these systems. 
>Specifically, I am looking for any test data that shows how much
>perchloroethylene carbon bags, or pellets, cartridges, whatever are able
>to remove from the waste water.

>3.  Manufacturers and test data related to portable leak-detection equipment
>used for the detection of fugitive perchloroethylene vapors.

>If you have any information regarding the above subjects, or know of someone
>or some database that does, then please reply.


>Thanks in advance for your help,

>             Richard Boyd
>             rabii@netcom.com



Dear Mr. Boyd,

Your  post  was especially timely for me.  I'm with  a  team
currently  evaluating  equipment  to  be  used  in  the  dry
cleaning  industry.   We've done some extensive  testing  on
various   filtration  methods  used  by   manufacturers   of
wastewater  evaporator systems. Various  forms  of  granular
activated  charcoal were tested. The filtration  media  were
contained  variously  in  cloth  bags,  open  beds,   filter
canisters, and static molded blocks.  Our influent  mixtures
contained  concentrations from 30 ppm to 150 ppm.   We  also
tested  mixtures that contained pure solvent visible to  the
eye.

All   the  above  devices  removed  some  solvent  from  the
solutions.   The least effective were the bags of   gac  and
the most effective were the pressurized canister types.  The
problem  with  the loose bed charcoal was  that  it  allowed
channeling  and minimized the contact with the  medium.  The
bags and the blocks were used in gravity situations and were
extremely  slow.   The best test results  we  were  able  to
obtain  using the loose charcoal were reductions to 5-6 ppm.
Using  the bags of charcoal, we initially tested as  low  as
2.5   ppm,   but,  the  efficiency  lessened  with  repeated
introduction of wastewater where the results were 10 ppm and
greater.  Using the pressurized filters in canister form  we
have  results as low as 25 ppb and as high as 92 ppb.  These
systems  also removed all the pure solvent that we added  to
the test mixtures.

Our results have been passed on to committee writing the new
regs  for  the dry cleaning industry.  Let me know how  your
evaluation is proceeding, if you get the chance.

Thanks

Michael Ockhertz