Residual chlorine must be maintained in
A) anaerobic sludge digestion.
B) primary sewage treatment.
C) secondary sewage treatment.
D) tertiary sewage treatment.
E) water treatment.

Question

Quizplus · Accepted Answer

Residual chlorine is maintained in water treatment to ensure the disinfection of pathogens and to provide a measure of protection against recontamination in the distribution system.

Residual Chlorine Must Be Maintained in