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Subject:	Re: RO recycling system problems
From:	"Robert E. Mesick" <[log in to unmask]>
Reply To:	[log in to unmask]
Date:	Wed, 20 Jan 1999 14:30:42 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (57 lines)

Date sent:              Wed, 20 Jan 1999 13:04:04 +0500
From:                   N Radhakrishna <[log in to unmask]>
Subject:                <No subject given>

> We are installing a R O plant to recycle effluent water. We find that the
> Total dissolved solids to be alright at 60 PPM but find that the copper in
> the water to be about 1 PPM.
>
> Is there any bad effects of presence of copper in rinse waters. Whereever
> criticallike bath makeup,gold plating etc we use DI water.
>
> If no how much is tolerable.
>
> An immediate reply on the above will be much appreciated.
>
> Regards
>
> N Radhakrishnan

Mr. Radhakrishnan,

One of the problems with RO is that they leak between 0.7% and 4% of the ions
through the membrane.  If you are concentrating to 2000 ppm, then between 14
and 80 ppm will be in the output (depending on membrane type and age.  As
age increases up so does the leakage).  Copper is divalent and should be
rejected almost completely.  You may have a very small leak some place.

To fix:
1.  Polish RO permeate with mixed bed DI column or
2.  Polish with cation/anion separate columns or
3.  Run Ultrafilter before RO to remove divalent cations and anions, about all
that is left would be Sodium and Chloride or
4.  IF the stream is only copper, nickel, lead bearing rinses, use chelated resin
to remove copper before the RO.

Best Regards,

Robert E. Mesick

Remco Engineering
Water and Wastewater Treatment Systems
http://www.remco.com
[log in to unmask]

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