From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf Of Bell,Martin
Sent: Thursday, March 31, 2016 8:28 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: Re: [DCHAS-L] Hydrofluoric acid solution neutralization...

It is my understanding that this would not qualify since the hydrofluoric acid is classified as toxic and corrosive. Elementary neutralization can only be performed on wastes that exhibit the corrosivity characteristic. 

A good source for treatment methodologies is Margaret-Ann Armour's book called "Hazardous Laboratory Chemical Disposal Guide". 

Martin 

We have a new project that is generating around 10 gallons of an aqueous solution per week consisting of <1% of hydrofluoric acid and nitric acid that is being collected and disposed of as hazardous waste. The PI wants to know if he can neutralize this solution and dispose as wastewater. There are two issues at play:

=B7        Does this waste qualify under the exemption to treat hazardous waste without a permit? The waste is hazardous because of its corrosivity (D002), and is listed as U134. But does the toxicity of the hydrofluoric acid, even at these very low concentrations, disqualify it from the treatment exemption?

=B7        If it can be treated, is there a widely accepted methodology for neutralization? I have seen multiple procedures either using calcium chloride solutions to bind the fluorine then flocculate into a cake for later disposal, or using sodium bicarbonate solutions for pH neutralization.

Regards,

G. Benjamin Cieslinski, EH&S Specialist III

Tulane University, Office of Environmental Health & Safety (OEHS)

Mailing: 1430 Tulane Avenue $8480, New Orleans, LA 70112-2699

Office: 1440 Canal St. Suite 1156

Direct: (504) 988.3996

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