Removal of heavy metals
In water treatment, the pH value is increased using Akdolit® products in order to remove heavy metals. Heavy metals have a tendency to precipitate as hydroxides at high pH values. This effect is used as a side reaction during decarbonisation to remove iron, manganese and other heavy metals.
The same effects as for heavy-metal removal are also obtained in the use of fixed-bed filters for the stabilisation of acidic soft waters by removing excess carbonic acid with lime or dolomitic products. In addition, Akdolit® offers also special filtration materials for manganese removal even in the neutral zone, a task that is hard to achieve compared with iron removal, which is generally performed without difficulty.