Date: Thu, 19 Aug 2010 22:40:46 -0700
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Jean & Ken Smith <smith.j.k**At_Symbol_Here**SBCGLOBAL.NET>
Subject: Re: Cupric Sulfate Solution Disposal
In-Reply-To: <584249.44963.qm**At_Symbol_Here**>

Hi Anthony,

There is another solution, however different, that you might use since you are at a university.  How about using the solution, perhaps concentrating it, and then have a general chem lab or physics lab retrieve the copper by electroplating it as a lab experiment.


This might lead to another disposal problem, but the metal would be gone.  The copper could be used possibly in another experiment.  Hopefully doing this could lead to less disposal for you.  And I agree strongly with some of the other comments about never using the term “waste” as it raises all kinds of red flags with those who are not as cognizant of chemistry as they should be.



Retired chemist and IH


-----Original Message-----
From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**] On Behalf Of Anthony Santoro
Sent: Thursday, August 19, 2010 9:55 AM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] Cupric Sulfate Solution Disposal


Hello Eric,

Thank you for your response, it prompted me to look up the sewer regulations rather than try to make a hazardous waste determination.  In 19.04 Rules of the City of New York (RCNY) I found that copper is limited to 5mg/l prior to discharge.  So I have my answer.

Thanks to everyone that responded.


--- On Thu, 8/19/10, Eric Clark <erclark**At_Symbol_Here**PH.LACOUNTY.GOV> wrote:

From: Eric Clark <erclark**At_Symbol_Here**PH.LACOUNTY.GOV>
Subject: Re: [DCHAS-L] Cupric Sulfate Solution Disposal
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Date: Thursday, August 19, 2010, 12:05 PM

Sometime during the process while you're figuring out how to manage that aqueous waste, be sure to contact the POTW and describe exactly what it is you're planning on putting down the drain.  Then be sure to get something in writing from them, don't accept a verbal OK from the POTW engineer over the phone.  You never know when you'll have to pull that letter out during an inspection.  I have a letter from the POTW granting permission to drain-dispose of pH-neutralized solutions of certain waste streams with very low concentrations of some D-coded metals.  These metals are well below the TCLP threshold concentrations and therefore are not HW by EPA's regulatory definition.  The POTW engineer might ask you to send a sample of that waste stream to a certified environmental lab for a proper hazardous waste determination and POTW compatibility testing before he signs anything.   

The POTW's major concern is that whatever wastewater they receive doesn't somehow kill their colonies of activated sludge.  If that happens, it's upsetting for them and they'll trace the contaminant back to the facility that caused the problem.  The folks here at one of the Los Angeles POTWs still talk about a colony-killing event that happened more than ten years ago and what a hassle that was for them to mitigate.       

And when you talk to the POTW, avoid using the words "Hazardous Waste" because that's an EPA regulatory term, and Hazardous Waste also carries waste codes - and they'll immediately remind you that you cannot dispose of "Hazardous Waste" down the drain.  Dilute solutions of cupric sulfate don't carry any EPA waste codes.  I think this is going to be easy waste stream problem for you to solve, and you'll save a lot of money in disposal costs in the long run if you do it right.   


Eric Clark, MS, CCHO, CHMM
Safety & Compliance Officer
Los Angeles County Public Health Laboratory

>>> Dan Crowl <crowl**At_Symbol_Here**MTU.EDU> 8/19/2010 8:01 AM >>>
Hi Anthony,

A general waste disposal guideline that I use for liquid waste to the
POTW is:

BOD:  200 mg/liter max
COD:  300 mg/liter max
Benzene:  0.050 mg/liter max
BETX:  0.750 mg/liter max
Temperature:  no greater than 104 deg. F
Ph:  no less than 5, no greater than 12.

Please be advised that there is a lot of local variation on this.

The chemical oxygen demand (COD) is probably the issue you will need to
deal with, although this is more relevant for organic rather than
inorganic compounds.

Dan Crowl
Michigan Tech

On 8/19/2010 10:52 AM, Bradley, Shelly wrote:
> City Sewer Ordinance here allows discharge to sewer system of copper at
> 2 ppm or less.
> Shelly Bradley
> Instrumentation Specialist
> Laboratory Development Assistant
> Campus Chemical Compliance Director
> Chemistry Department
> Hendrix College
> Conway, AR 72032
> (501) 450-3812
> bradley**At_Symbol_Here** <mailto:bradley**At_Symbol_Here**>
> ------------------------------------------------------------------------< br> >
> *From:* DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**] *On Behalf
> Of *Anthony Santoro
> *Sent:* Thursday, August 19, 2010 9:12 AM
> *To:* DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
> *Subject:* [DCHAS-L] Cupric Sulfate Solution Disposal
> Hello,
> I am curious as to how others may be handling dilute solutions of cupric
> sulfate. Do you drain dispose if it is a very low concentration? At what
> concentration would you consider managing this solution as hazardous waste?
> Regards,
> Anthony


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