Drinking & Process Water

 Drinking & Process Water

Drinking & Process Water

Lime and dolomitic lime based products are used in various stages of domestic, industrial and process water treatment. These products correct drinking water hardness and prevent the formation of scale, facilitate organic matter flocculation, precipitate phosphates and heavy metals in industrial water.


Drinking water

Drinking water must be pure as it is crucial to sustaining human life on earth. As an integral part of the water purification process, milk of lime or lime slurry softens or remineralizes in order to achieve a calco-carbonic balance, flocculates organic matter and precipitates trace metals. 


When water is too soft (too acidic), it can damage metallic pipes. Lime neutralizes the corrosive action of the dissolved carbonic acid by transforming it into a calcium formulation. This leads to hydrogen carbonate.



If water is too hard, it forms scale and needs to be decarbonized. Two types of processes are used for this: fast pellet reactor and slow decarbonization. Lhoist provides special types of lime slurry that are particularly well-suited to decarbonization. They ensure fast reaction time, low particle size and high concentration.

pH Adjustment for Drinking Water

In processing groundwater to drinking water an important step is adjusting the pH from a weak acid to weak base.  Alkaline reagents are used for the pH adjustment to a range of 6-9.  This results in water softening, metal removal, increasing alkalinity and calcium addition.  Lime, as calcium hydroxide, is more effective than other alkaline reagents and offers greater flexibility for the differing aspects of water treatment.

Process water

Many industries need large quantities of softened water, particularly as cooling water for circuits and boilers, in order to prevent the formation of scale. Lime slurry is used in the preparation of process water as a cost-effective treatment that softens water by precipitating the bicarbonates dissolved in the water.

Lhoist’s lime slurry products are ideal for decarbonization, offering fast reaction time, low particle size and high concentration.