Lime is used in the treatment of all types of water, both drinking water and wastewater, civil and industrial, to improve the chemical characteristics and to remove specific pollutants before it is transferred to a purification plant or surface water body.
- Softening: hard water, that is water rich in dissolved bicarbonates, is softened by using lime which gives rise to insoluble carbonates that can be removed easily.
- pH correction: lime is a basifying reagent commonly used to raise the pH level of drinking water and wastewater.
- Neutralisation: lime is a strong base and has a high neutralising capacity for any acids contained in water (sulphuric, hydrochloric, hydrofluoric, nitric, etc.) with a very low specific consumption.
- Metal removal: lime eliminates the metals contained in wastewater by making them precipitate in the form of insoluble hydroxides, as a function of the pH value.
- Removing sulphur, phosphorus, fluorine: lime removes the sulphates, phosphates and fluorides present in water by precipitating them in the form of insoluble salts.
- Civilian wastewater: lime performs multiple tasks: it sanitises grilling residues, reduces BOD and COD in primary sedimentation, mitigates bulking phenomena, flocculates the organic substance precipitating in the form of mud, and precipitates any heavy metals.