How to responsibly dispose of old coolant?

[clogan]

Folks get confused between ethylene glycol, and propylene glycol.  Over the years same can be said of ethyl alcohol and methyl or denatured alcohol.  One will get you drunk, the other will get you dead...There is also 70% Isopropyl alcohol and 99% isopropyl, one for disinfecting or massaging, the other for burning.

Here's what the US gubment says about antifreeze recycling...

http://www.epa.gov/epawaste/conserve/materials/antifree.htm

The gubment link above in turn routes you to an "earth911" web site, which in turn claims that Advance Auto Parts in my area accepts used coolant. However, based on telephone calls to store managers, this is NOT the case.

I guess I'm sending it to the land fill is old milk jugs.

[mkurland]

I send it to the water treatment plant, i.e. I flush it

[Conrad]

I send it to the water treatment plant, i.e. I flush it

Perhaps you didn't see the thread tittle?

[gPink]

I send it to the water treatment plant, i.e. I flush it

Perhaps you didn't see the thread tittle?

'The solution to pollution is dilution.' 

[jwh20]

Most anti-freeze/coolant is based on ethylene glycol.  While it can be poisonous if ingested it's a relatively harmless substance and it readily and rapidly breaks down in the environment.  So flushing it is not such a bad idea.

Here is an article:

http://www.inchem.org/documents/cicads/cicads/cicad_22.htm

Key point:

Ethylene glycol is readily biodegradable in standard tests using
    sewage sludge. Many studies show biodegradation under both aerobic and
    anaerobic conditions. Some studies suggest a lag phase before

    degradation, but many do not. Degradation occurs in both adapted and
    unadapted sludges. Rapid degradation has been reported in surface
    waters (less in salt water than in fresh water), groundwater, and soil
    inocula. Several strains of microorganisms capable of utilizing
    ethylene glycol as a carbon source have been identified.