Question 73General Subjects - QMED

70% to pass

By what means is biological sewage treatment plant effluent disinfected before discharge overboard?

ADisinfection is not required on biological sewage treatment plants.
BUltraviolet light irradiation is the only approved means of disinfection.
CHypochlorite tablets or liquid solution and ultraviolet irradiation are both approved means of disinfection.
DHypochlorite tablets or liquid solution is the only approved means of disinfection.
AI Explanation

The correct answer is C) Hypochlorite tablets or liquid solution and ultraviolet irradiation are both approved means of disinfection. Explanation: Biological sewage treatment plants are required to disinfect their effluent before discharging it overboard to prevent the spread of waterborne pathogens. Both hypochlorite (chlorine) treatment and ultraviolet light irradiation are approved methods for disinfecting the effluent under Coast Guard regulations. Option A is incorrect as disinfection is required. Option B is incorrect as both chlorine and UV are approved, not just UV. Option D is incorrect as both disinfection methods are approved, not just chlorine.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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