What process begins after the destruction of chloriganics and chlorimines?

The correct choice indicates that the process that begins after the destruction of chlorinated hydrocarbons, such as chlororganics and chloramines, is the formation of free residual chlorine. This takes place because chloramines and other chlorinated compounds often act as chlorination byproducts in water treatment processes. When these compounds are destroyed, they release chlorine that was previously bound in these complex chemicals back into a free state. This free residual chlorine is crucial for maintaining disinfection efficacy in the water system.

Free residual chlorine is vital because it ensures that any remaining pathogens in the water are effectively inactivated. This residual is often monitored and managed to guarantee water safety as it moves through the distribution system.

Understanding the role of free residual chlorine is essential for water treatment operators, as maintaining an adequate level of chlorine is important for public health and compliance with water quality standards.