I hope someone can assist with the head scratching occurrence.
I recently encountered an issue whereby a large container of waste water containing small amounts of Ammonium Nitrate, Aluminium and Hexamine started a small reaction within the container. The temperature within the container rose to 75c resulting in a small amount of gas which smelled like formaldehyde omitting from the water container. The outside temperature was 40c but the container was semi submerged.
My question is because the smell of Formaldehyde I assume the hexamine has reacted with something but with what?
There were elements of cow dung evident and broken masonry/cement close to the container which could have entered the container. Could this have been a contributing factor?
What other elements would cause hexamine to react in this way?
If anyone can assist I would be most grateful.