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Waste water:
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In treating water generated by industrial or urban use (industrial effluent treatment plants), some of the most important uses of lime are:
- pH control.
- Neutralisation, coagulation, flocculation and precipitation of phosphates, sulphurs and fluorides that are easily recoverable as insoluble calcium salts when the pH approaches 7.
- Precipitation of heavy metals (lead, chrome, copper, manganese, nickel, arsenic, cadmium) as well as other metals (zinc, aluminium, iron, etc.) which are dissolved and then precipitated in the form of hydroxides.
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Drinking water
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Drinking water should not only be pure but should also have the correct calco-carbonic balance:
Ca(HCO3)2 = CaCO3 + H2O + CO2
This balance, which can fluctuate, should be kept constant. The use of lime in both quicklime and calcium hydroxide form enables:
- The pH to be adjusted.
- Excessively soft (aggressive) water to be remineralized.
- Excessively hard water to be decarbonated. |
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