Hello Rudy Sedlak
please could you send me a copy of this article also.
Thanks
Michael Busfield
Shift Chemist
Philips Printed Circuits (UK) Ltd
19 Commerce Way
Purley Way
Croydon
United Kingdom
CR9 4JA
phone: 0181 6887766
fax: 0181 6813106
>----------
>From: Nicholas Kane[SMTP:[log in to unmask]]
>Sent: 29 October 1997 10:08
>Subject: Re: waste treatment
>
>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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