The main risk of depositing solid wastes on landfills or other sites is the leaching of the heavy metals, even from rainwater, and their subsequent transport to the aquifer resulting in the pollution of the surface and underground water. This type of pollution is even more direct than liquid wasters that contain heavy metals.
The hydroxides of the heavy metals have very low solubility at a pH range of 9-10, conditions that can easily be achieved by the presence of magnesia or magnesium hydroxide.
Consequently, by using magnesia or magnesium hydroxide we achieve the precipitation of heavy metals in wastewater as well as stabilization and bonding of the heavy metals that are found in solid wastes.
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