California Wastewater Operator Exam, Disinfection and Dechlorination: all 20 questions
All questions from the Disinfection and Dechlorination section for California Wastewater Operator Exam, each with the correct answer.
- 7001In California operator certification regulations, disinfection includes
- 7002The chemical commonly used for dechlorination is
- 7003What is chlorine demand?
- 7004Chlorine residual is
- 7005Combined chlorine residual is formed when chlorine reacts with
- 7006Compared with free chlorine, combined chlorine residual is
- 7007Which factor does NOT improve chlorine disinfection?
- 7008A chlorine contact tank is designed to provide
- 7009For disinfected tertiary recycled water, California Title 22 requires a chlorine disinfection process to provide a CT of at least 450 mg-min/L and a modal contact time of at least
- 7010How is chlorine gas supplied to treatment plants?
- 7011Sodium hypochlorite is
- 7012Ultraviolet (UV) disinfection works by
- 7013Which water quality factor most strongly reduces the effectiveness of UV disinfection?
- 7014Which test is used to monitor whether a UV system is delivering a proper dose?
- 7015Which regulatory action may result if chlorine residual in a discharge exceeds the permit limit?
- 7016The best way to confirm that sulfur dioxide is not over-applied in dechlorination is to
- 7017Which action is part of safely changing a chlorine cylinder?
- 7018Breakpoint chlorination refers to
- 7019Why are chlorine cylinders stored upright and secured?
- 7020A chlorine residual in the effluent that suddenly drops while the dose stays the same most likely means
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