Ziay!

tonio mariano

proper disposal of ashes especially ashes from burnt materials such as treated and painted lumber

~Surprise~ (Cheese whiz)

It can black out the sun and all organisms will die of no sunlight and infected water ( because of the ashes)

carbonates

Most wood ashes are actually beneficial for the environment. They are rich in potash and can be used as fertilizer for plants. I normally take the wood ashes from my fireplace and put it on my garden. It is also beneficial because it will neutralize acid soils, making certain plants healthier.

Burning treated wood is extremely DANGEROUS though because it contains high levels of arsenic and other heavy metals that are both released in the smoke and left behind in the ashes. These ashes would be considered hazardous waste and in some places burning this is actually a violation of the law. This hazard is from the chromate copper arsenate used for decades in treated wood such as power poles, fencing, decking, and other applications. There are several new types of wood treatment but I doubt these are safe to burn. One new one is alkaline copper quaternary, and since it still has copper in it, it probably is not safe to burn. Wolmanized (trademark) wood is still treated with chromium copper arsenate.

Paint is not as big a problem, depending on the paint type. Latex (water based) paints have clay as one of the main components, which is harmless and will not burn. Some pigments like white are made from titanium oxide, but this is inert so I doubt it is a problem. The real danger with paint is that older structures may have been painted with lead based paint. Paint containing mercury, cadmium, chromium, barium and arsenic was also used in the past. Mercury in interior paints was not banned until 1990 in the US. This would be very hazardous becuase the lead or other metal would probably be released both in the burning and left behind in concentrated form in the ashes.

The links below provide more information on treated wood and hazards of paint.