Have you evaluated using #6 Portland cement to solidify the effluent? In the early 1990's the EPA research lab at the University of Cincinnati conducted numerous studies on stabilization and solidification of hexavalent chromium and mercury. My recollection was the #6 cement was very effective.
Paul
-----Original Message-----
From: Ernie Lippert Sent: Mar 5, 2015 7:55 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] Mercury in laboratory effluent
The ASTM method D1252-88, Standard Test Methods for Chemical Oxygen Demand (Dichromate Oxygen Demand) of Water is used as the basis of determining the COD for other materials, not just [waste] water. This procedure specifies the use of 1 gm of mecuric sulfate per sample to minimize the effect of chloride ions which may be present. The waste from such determinations contains considerable mercury. There are likely to be other procedures in which mercury is used. How do academic and commercial labs economically handle such waste that consists mostly of water containing Hg and a few other less regulated contaminants? I believe the current allowable level for discharge is 1.0 ppb Hg.
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