Working in a building that uses propylene glycol (PG) as antifreeze in a hydroponic heating system. With complaints of chemical odors in offices, I conducted air sampling for glycols, aldehydes, and PAHs. No airborne glycol or PAHs were detected, but low levels of aldehydes; acetone, acetaldehyde, butyraldehyde and formaldehyde are present building wide. Not a chemist, so question is, if there is a leak in a closed hydroponic heating system, does the PG oxidize to aldehydes when it encounters occupied air?

A thick bioslime was present on the interior surface of the mechanical room glycol tank. I was told that when glycol is exposed to air, it generates nutrients for microbes. The bioslime analyzed as Yeast, and some PG is generated by Yeast and carbohydrates - all news to me.

  • $\begingroup$ By "bioslime" you probably mean "biofilm". You will find a lot more articles about "biofilms" on the web $\endgroup$ – SteffX Feb 8 at 14:32

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.