In meeting the growing water requirements of our population and industries, we must use more plentiful raw water sources such as rivers, lakes, high-volume wells, etc. Generally, these sources must be treated to meet our end use needs, including municipal drinking water quality standards. Not only does lime play an important role in these purification processes, it is also used in pumping the water safely to the customers.
Part of the water that we "borrow" every day becomes contaminated and needs to be re-processed for discharge into the environment or reused. Again, lime is there to assist in the retreatment processes plus one other important feature, disinfection of the removed contaminants before disposal. This can be achieved via pH control or taking advantage of quicklime's exothermic heat release property when mixed properly with water.