I recommend separating the waste waters from the steel vs. stainless and having EACH of them tested for presence of hazardous waste components. Iron, copper, etc. may be present for the steel, but they may expect hex-chrome from the stainless plasma cutting.
The key questions are: if the contaminants are present above regulatory levels of hazardous wastes AND what employees could be exposed to during the process. They have two methods to determine waste disposal characterization, generator knowledge or analytical results. Occupational exposures during the process are a separate material issue that needs to be quantified before those questions can be answered.
They need to look at two aspects, employee exposure during generation v. disposal, which are completely different and need to be kept in their respective aspects.
From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Laurie Yoder
Sent: Sunday, September 23, 2018 2:17 PM
Subject: [DCHAS-L] hexavalent chromium
I'm asking a question on behalf of someone who runs a small machine shop. They use a plasma cutter with a water table, mostly for steel, but also some stainless steel. The question is whether hexavalent chromium will be present in the water bath (along with the iron, copper, and whatever else is in there, in their respective oxidation states). Does anyone have experience with these systems and proper disposal of the bath-water?
Laurie M. Yoder
Assistant Professor of Chemistry and Chemical Hygiene OfficerEastern Mennonite University
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