Rancid Oils disposal

[Petraji]

I checked repeatedly for a thread with this concern. Does anyone know how to dispose of oils that are rancid - or just plain OLD? I have remnants of olive, canola, various herb infused oils and I need to get rid of them - without damaging the environment. Please?

 

[lsg]

We have a gravel driveway, if you have such a thing, you could just pour the oil on that. It would be no worse than the county oiling our roads every fall.

 

[DeeAnna]

You might ask at a restaurant if you can dispose of your oil in their used oil container.

 

[Hendejm]

According to the interwebs:

Vegetable oils, such as canola or olive oil, are compostable in small quantities. Oil can also be used to kill weeds; just place it in a spray bottle and spray those unruly nuisances away. It's like killing two birds with one stone.

I like the idea of using it to kill weeds! Much better than - commercial weed killer like roundup!

 

[SaltedFig]

I checked repeatedly for a thread with this concern. Does anyone know how to dispose of oils that are rancid - or just plain OLD? I have remnants of olive, canola, various herb infused oils and I need to get rid of them - without damaging the environment. Please?

How much oil are you looking to dispose of? Under a litre and I'd be considering finding a composting method (driveway, fenceline, weeds, paper soak and into compost system etc.). Oil breaks down fairly readily in small amounts - as part of composting, treat it as the "green" component, and add dry matter like leaves or compost safe paper.

@Hendejm, that works best on broad leaf weeds, and the underside needs to be "painted" as well. Funny enough, a little soap helps it stick (a small amount of potassium soap would be better than sodium soap - the result will end up feeding the soil). The oil works by blocking up the "breathing holes" of the plant, so the whole plant, including underneath of every leaf, needs doing at once (here, in Summer, the plant also gets burnt!). Add flooding the roots as well and the oxygen cycle is interrupted - it takes a little while for the anaerobic soil bacteria to re-colonize if you do the root flooding step, so it's a sometimes treatment .

Over a litre and I'd be considering DeeAnna's suggestion (or talk to the local waste processing plant, if they allow public access where you are?).

 

[kayak1987]

Why not to make....................... SOAP!
Maybe rancid oils are not good to make those superfatted cold process soaps but if you use the "good old" method, you can still get a good soap for washing stuffs

You need to slowly heat the oil to boiling point, in this way you will make a first "rectification" of volatile bad smelling compounds (if it smells, it flies) cool down
Then you make the saponification in salty water (30% brine) with extra water and extra lye (wateril 3:1 and 20% extra lye) all cold at first, adding the water-salt-lye solution little by little
then gently heating to boiling for a couple of hour at least, mixing well whit a whisk.
the soap will came up, while impurities remains in the water and remaining volatile bad smelling compounds flies away
then you take out the soap and repeatedly wash in new saturated brine 2 or 3 times brine:soap 1:1 until it is no more alkaline.

the process is a little bit more tricky maybe but gives you a pure soap, whitout glyceryn, something like the one used for washing machine powder