What formula determines chlorine demand?

The formula used to determine chlorine demand is based on the relationship between the chlorine dose applied and the chlorine residual that remains after a specified contact time. Chlorine demand reflects how much chlorine is consumed by the water or any contaminants within it.

To calculate this, you subtract the chlorine residual from the chlorine dose. The chlorine residual represents the amount of chlorine that remains available in the water after it has reacted with any contaminants or has been utilized for disinfection processes. The chlorine dose is the amount of chlorine that is initially added to the water.

Thus, the formula for determining chlorine demand accurately demonstrates how much of the chlorine that was introduced has been used up or reacted with substances present in the water. This measurement is vital for water treatment processes, as it gives insight into the effectiveness of disinfection and helps in adjusting chlorine dosages accordingly for optimal treatment.