[labnetwork] Piranha disposal

[Weaver, John R]

Michael -

That sounds like a good system. As I'm sure you already know, you need to periodically check the integrity of the seals around the drain - that would be the most likely failure point.

John

-----Original Message-----
From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Michael Khbeis
Sent: Wednesday, February 04, 2015 3:35 PM
To: julia.aebersold at louisville.edu
Cc: Vito Logiudice; labnetwork at mtl.mit.edu
Subject: Re: [labnetwork] Piranha disposal

Nava, 

We have drains in our dedicated piranha tanks.  They have a 10:1 dilution valve with water during the draining. This goes to Acid Waste Neutralization system where it is pH balanced with caustic soda (aka sodium hydroxide) before going to sanitary sewer. 


Dr. Michael Khbeis
Associate Director, Washington Nanofabrication Facility (WNF) National Nanotechnology Infrastructure Network (NNIN) University of Washington Fluke Hall, Box 352143
(O) 206.543.5101
(F) 206.221.1681
(C) 443.254.5192
khbeis at uw.edu
www.wnf.washington.edu/



> On Feb 3, 2015, at 2:28 PM, julia.aebersold at louisville.edu wrote:
> 
> We do the same as John mentioned in his response with a long plenum flush to help neutralize it as much as possible.
> 
> Cheers!
> 
> Julia Aebersold, Ph.D.
> MNTC Cleanroom Manager
> University of Louisville
> 2210 South Brook Street
> Shumaker Research Building, Room 233
> Louisville, KY  40292
>  
> (502) 852-1572
> http://louisville.edu/micronano/
> From: labnetwork-bounces at mtl.mit.edu [labnetwork-bounces at mtl.mit.edu] on behalf of Vito Logiudice [vito.logiudice at uwaterloo.ca]
> Sent: Tuesday, February 03, 2015 12:56 PM
> To: 'Nava Ariel- Sternberg'
> Cc: labnetwork at mtl.mit.edu
> Subject: Re: [labnetwork] Piranha disposal
> 
> Hi Nava,
> 
> We have yet to come up with a formal standard operating procedure for our dedicated piranha hood. I suspect we will very likely proceed in a manner that is identical with John's description after letting the solution cool down for some minimum amount of time. The hood is equipped with a proper aspirator and the facility is served by an acid waste neutralizing system. 
> 
> Best regards,
> Vito
> --
> Vito Logiudice  P.Eng.
> Director of Operations, Quantum NanoFab
> University of Waterloo
> Lazaridis QNC 1207
> 200 University Avenue West
> Waterloo, ON           Canada N2L 3G1
> Tel.: (519) 888-4567  ext. 38703
> Email: vito.logiudice at uwaterloo.ca
> Website: https://fab.qnc.uwaterloo.ca
> 
> 
> From: <Weaver>, John R <jrweaver at purdue.edu>
> Date: Tuesday, 3 February, 2015 8:13 AM
> To: 'Nava Ariel- Sternberg' <anava at tauex.tau.ac.il>, "labnetwork at mtl.mit.edu" <labnetwork at mtl.mit.edu>
> Subject: Re: [labnetwork] Piranha disposal
> 
> Nava -
> I'm in favor of aspirating it from the bath into a significant stream of running water. That would, of course, go to an acid-neutralization system.
> The big advantage of this approach, of course, is the cooling as well as diluting effect of the water stream. It is important to be sure the aspirator and associated tubing will withstand the heat and oxidizing properties of the stream.
> John
>  
> From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Nava Ariel- Sternberg
> Sent: Tuesday, February 03, 2015 2:49 AM
> To: labnetwork at mtl.mit.edu
> Subject: [labnetwork] Piranha disposal
>  
> Dear all, 
>  
> Sorry for the lame-man question but our safety unit managed to confuse us with weird recommendations so I'm checking with you guys:
>  
> What is the best, safest, and most practical way to dispose piranha solution?
>  
> Thanks,
>  
> Nava
>  
>  
>  
>  
> Nava Ariel-Sternberg, Ph.D.
> Tel-Aviv University Center for Nanoscience and Nanotechnology, Managing Director
> MNCF Manager
> Phone: 03-640-5619
> Mobile: 054-9984959
> Email: anava at tauex.tau.ac.il
>  
> _______________________________________________
> labnetwork mailing list
> labnetwork at mtl.mit.edu
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