Question

which disinfection method for sewage treatment may produce undesired compounds like chloramines?
ultraviolet light
chlorination
filtration
ozonation

Explanation:

Chlorination involves adding chlorine to sewage. Chlorine can react with ammonia - nitrogen compounds present in sewage to form chloramines. Ultraviolet light, filtration, and ozonation do not produce chloramines during sewage disinfection.

Answer:

chlorination