Printech Archive
Re: sulfites


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From: Steven Noble (Snoble@pmai.org)
Date: Wed Mar 03 1999 - 11:20:06 CST


Sherry,
Sulfur compounds exist in photoprocessing. Generally the effluent from the
development of film contain thiosulfate. Although it is in a sulfate form,
the analysis could be mistaking it for sulfides or there could be some
valance swapping going on in the effluent. I'm not an analytical chemist but
can get more detail if you need it.

Steve Noble
Photo Marketing Association
1-800-762-9287

-----Original Message-----
From: Sherry Davis [mailto:sdavis@oz.oznet.ksu.edu]
Sent: Wednesday, March 03, 1999 11:17 AM
To: printech-and-printreg@great-lakes.net
Subject: sulfites

Dear PNEAC members,
I had someone from a WWT facility approach me with a question I can't
answer, so hope someone out there can provide some insight:
Two printers, one newsprint and one that prints on carboard boxes,
are causing problems for the WWT plant because of high levels of
sulfides in their wastewaters. Both are considered low flow
dischargers. I don't have anymore information than that, and he
wants to know where in their processes the sulfides would be coming
from. Does anyone have any ideas? Both of these companies have had
silver discharge problems which have been solved (might their silver
removal process be involved?)
Any help would be appreciated.
Sherry Davis

Sherry J. Davis
Industrial P2 Specialist
sdavis@oz.oznet.ksu.edu
133 Ward Hall,KSU
Manhattan, KS 66506-2508
785-532-6501 Fax: 785-532-6952


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