What happens when chlorine dosage is increased during chlorination?

When the dosage of chlorine is increased during chlorination, it typically leads to a corresponding increase in the chlorine residual detected in the water. Chlorine residual is the amount of chlorine that remains in the water after the initial reactions have occurred, including disinfection and reaction with organic and inorganic materials.

Increasing the dosage allows for more chlorine molecules to remain unreacted, as there is a larger supply of chlorine available for disinfection purposes. The total amount of chlorine that successfully adheres to pathogens and organic matter increases the residual concentration left in the water system. The residual is crucial as it indicates the effectiveness of disinfection and helps ensure that water remains safe throughout the distribution system.

In summary, a higher dosage enhances the opportunity for chlorine to perform its disinfection role while also increasing the residual level in the system, which is essential for maintaining water quality and safety.