"In cement factories as in glass factories, heavy metals come mainly from the raw material and not from fuels. On the other hand, in cement factories, the vast majority of metals in the gas phase in the clinker furnace are captured in the cement and not influence the environment more. "
source: http://environnement.wallonie.be/enviro ... yn-min-mel
So no worries to do.
Make rainwater drinkable
- antoinet111
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