Polyolester oil recycling

Hi, everybody. I was away for few years. ;)
Anyway, here's an issue I came across recently.
I tried searching on the forum, on the internet and even on the search engines of internation journals of academic research, with not much success.

Is there any company or organisation technically able to recycle poe oil?
I don't mean to dispose of it. I mean to be able to rework the polluted oil and return it back in the chain of supply, either as POE oil or lubricant/grease of some sort.
I've been stockpiling used oil from decommissioned compressors and would like to responsibly return it in a environmental-sustainable and circular way.

Thanks everybody.

Hope you are keeping well!

I don't know of any such service, any oil I collect I give to a friend of mine who runs a garage, they burn it along with used engine oil in their waste oil burner to heat their workshop.