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Precipitation

Precipitation

In precipitation, certain chemicals are added to water to cause the ions present to react and form insoluble compounds. Because of their insolubility, these compounds precipitate out and the precipitate can subsequently be removed through sedimentation, sand filtration, etc.

Precipitation is usually used to remove heavy metals. The chemicals used for this purpose are usually basic (such as sodium hydroxide) which raises the pH.
precipitatie
As a result of this dosing, metals form a hydroxide and precipitate out.  
Logisticon has been using this technology in environmental technical installations since way back (remediation of groundwater contaminated with metals), but it is also used in the production of process water and the treatment of waste water.