| abstract |
At the same time, a step of removing silica from natural water or wastewater containing silica and scale-forming ions to reduce its total hardness is described. The steps consist of (i) a precursor of magnesium hydroxide or magnesium hydroxide and (ii) a soluble aluminic acid compound or aluminic acid, while maintaining a pH of> 8 to form layered double hydroxides in situ. Containing the addition of a salt precursor to the water, where the layered double hydroxide contains scale-forming ions in the lattice of the layered double hydroxide, and silica is the layered as an interlayer anion. The double hydroxide is contained in the lattice and / or is bonded by the layered double hydroxide via one or more bonding modes. [Selection diagram] None |