Which disinfectant provides the longest-lasting residual in treated water?

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Prepare for the ADEQ Water Treatment Grade 4 Test. Study with flashcards and multiple-choice questions, with each question offering hints and explanations. Ace your exam!

Multiple Choice

Which disinfectant provides the longest-lasting residual in treated water?

Explanation:
Chloramines provide the longest-lasting residual because they are chemically more stable in water distribution systems. They form when chlorine reacts with ammonia, creating monochloramine and other chloramines that persist longer and dissipate more slowly than free chlorine. Free chlorine is highly reactive with organic matter and other substances, so it is consumed quickly and its residual fades. Ozone is a strong oxidant that reacts rapidly and off-gasses, leaving little residual. Chlorine dioxide also provides a residual but tends to decay faster than chloramines. So, chloramines maintain protection in the system the longest.

Chloramines provide the longest-lasting residual because they are chemically more stable in water distribution systems. They form when chlorine reacts with ammonia, creating monochloramine and other chloramines that persist longer and dissipate more slowly than free chlorine. Free chlorine is highly reactive with organic matter and other substances, so it is consumed quickly and its residual fades. Ozone is a strong oxidant that reacts rapidly and off-gasses, leaving little residual. Chlorine dioxide also provides a residual but tends to decay faster than chloramines. So, chloramines maintain protection in the system the longest.

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