MHT CET Biology question

Identify the incorrect statement regarding the process in sewage treatment. [MHTCET 2023]

(A)Primary treatment is a physical process
(B)Secondary treatment is a biological process
(C)The BOD of effluent increases after secondary treatmentCorrect
(D)The tanks used for tertiary treatment are anaerobic sludge digestersCorrect

Answer: (C),(D)

Solution

Primary treatment is physical and secondary treatment is biological, so (a) and (b) are correct; BOD falls (not rises) after secondary treatment and anaerobic

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Question ID VK-044148