Could you perhaps fax me this article also?
Thankyou
Nicholas Kane
Axion Australasia
651 Canterbury Road
Surrey Hills
Victoria
Australia
fax 613 9899 3811
At 11:24 28/10/97 -0500, you wrote:
>Marie:
>
>We do not supply anything in waste treatment, but as a chemistry supplier, we
>are intimately involved in the issue. I advise you that the BEST thing that
>you can do to ease the issue, and cut costs is to separate your wastes, and
>treat them in different ways.
>
>The presumption is that the only issues that you have in your waste water are
>pH and dissolved heavy metals.
>
>Most of the time you can separate your waste streams into the following
>categories:
>
>1. Chelated, low, to neglible metal (rinses from resist strippers, alkaline
>cleaners, etc.)
>2. Chelated, high metal, (Electroless Copper rinse, and bailout, ammoniacal
>etch rinse)
>3. Non-Chelated, high metal (microetch rinse, electrolytic plating rinse,
>etc.)
>
>On the first category, simple pH adjustment may be all that is required, do
>this, and put it down the drain, if the metal is low enough, do not allow the
>chelates to mix with category three, or you jack the cost of treatment to the
>sky.
>
>Category three can best be treated by pH adjustment, and precipitation of
>metal sludge.
>Cheap and simple.
>
>Category two is the big expense, and if you mix all your wastes, all the
>waste becomes category two waste. This must be treated by ion exchange, or
>precipitation with special chemicals, like sulfides, or weird expensive
>organics, to remove the metals from the chelates.
>
>This is pretty general stuff, but it is very often overlooked as a powerful
>tool to assist and cut costs in waste treatment.
>
>If I can be of more assistance, contact me off line.
>
>Incidently, if you want to send me your fax number, I have an article on
>chelates and waste treatment that you might find interesting.
>
>Best regards,
>
>Rudy Sedlak
>RD Chemical Company
>
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>
Nicholas Kane
Axion Australasia
Suite 3, 651 Canterbury Road
Surrey Hills
Victoria 3127 Australia
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