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What's wrong with this stuff that it requires discharge ? At 7 - 9 %, could
it be concentrated for reuse ? Can the process be improved to avoid its
generation ? In the metal finishing industry, highly silicated cleaners and
etchants are shipped off for treatment because they are a pain to treat
on-site. If the silicate contacts an acid waste inside the piping, it will
set up a very thick gel that blocks the line. If you can get it to your pH
adjustment tank, it forms a gelatinous floc that doesn't settle and is
impossible to filter.
Since silicates are used in the metal finishing industry, perhaps a
formulator would take it as a feed material. It will depend on volume and
quality of the waste. The presence of Mg and Al may negate this option.
Also, silicates have fallen into disfavor because of the problems stated
Perhaps the best approach would be to evaporate the wastewater and landfill
the solid. The solid should be nonhazardous (check the pH) and you would
avoid upsetting the existing treatment system. If the existing system
generates hazardous waste, then this segregation would also help minimize
the volume of haz waste generated.
Just some thoughts.
> From: Rushton, Chris[SMTP:Chris.Rushton@STATE.ME.US]
> Reply To: Rushton, Chris
> Sent: Wednesday, September 16, 1998 8:01 AM
> To: P2 Tech
> Subject: discharge
> A facility would like to discharge sodium magnesium aluminum silicate in
> it's wastewater stream. The discharge is quite strong,~7-9%! Not ppb or
> ppm, but %! Does anyone have an idea for the appropriate discharge of
> sodium magnesium aluminum silicate, a synthetic filler for the paper
> industry? Is there a way to market this waste product? Does anyone have
> expereince with reducing sodium magnesium aluminum silicate at the
> Chris Rushton
> Maine DEP