Ethanol may be flushed down a sink so long as it is diluted with 
enough water to lower the concentration to below 70%. This is to 
raise the flash point.
Mind, this is for ethanol. If it's contaminated with fun things like 
ferrocyanide or whatever, then the ferrocyanide or whatever disposal 
rules apply.

Phil

>Greetings,
>     This is perhaps a very simple question....but what do other labs do with
>their 95% alcohols?  I know recycling is what happens most.  Does anyone know
>if it is okay, or outrageous to dispose of 95% alcohols down the sink when
>there is too much to recycle?  I read in some literature that putting 95%
>alcohol down the drain was okay, but with large amounts of water.  How much
>95% is okay for sink disposal?
>
>Deb

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Philip Oshel
Supervisor, AMFSC and BBPIC microscopy facilities
Department of Animal Sciences
University of Wisconsin
1675 Observatory Drive
Madison,  WI  53706 - 1284
voice: (608) 263-4162
fax: (608) 262-5157 (dept. fax)