What process does recarbonation refer to?

Recarbonation is the process of adding carbon dioxide to water. This technique is primarily used to adjust the pH levels and to stabilize the water after treatment processes, such as lime softening or after the removal of hardness through other means. When carbon dioxide is introduced, it reacts with water to form carbonic acid, which lowers the pH and helps prevent corrosion in distribution systems.

This process is crucial in drinking water treatment, particularly after alkalinity is altered during lime softening, ensuring that the water remains within an acceptable pH range for both safety and aesthetic reasons. By adding carbon dioxide, operators can effectively manage the water chemistry, enhancing its overall quality for consumers. Understanding recarbonation in water treatment underscores the importance of maintaining balanced water chemistry in ensuring safe and palatable drinking water.