Question 2029 of 223 · California Water Treatment Operator Exam
What is the main reason chloramines are used as a secondary disinfectant in some distribution systems?
Exactly one answer is correct.
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Correct answer to question 2029
- C: They form fewer trihalomethanes and last longer in the distribution system
Explanation
Chloramines are weaker but more persistent and produce less THM and HAA5. They are not used for primary disinfection when high CT is needed.
More questions: Water Treatment Processes
- 2031The CT value used in disinfection is calculated as
- 2032A clearwell provides a T10 contact time of 40 minutes with a free chlorine residual of 1.2 mg/L. What is the CT?
- 2033If the required CT is 60 mg/L-min and the actual CT is 90 mg/L-min, the inactivation ratio is
- 2034Which of the following disinfection byproducts is regulated as total trihalomethanes (TTHM)?
- 2035Which action is most effective for reducing the formation of disinfection byproducts in a treatment plant?
- 2036Which treatment technique is commonly used to control corrosion of lead and copper in a distribution system?