NEET 2011 Biology question

Secondary sewage treatment is mainly a

(1)Physical process
(2)Mechanical process
(3)Chemical process
(4)Biological processCorrect

Answer: (4)

Solution

Primary treatment of sewage removes floating and suspended solids by physical processes (filtration and sedimentation). In secondary (biological) treatment, the primary effluent is passed into aeration tanks where aerobic

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Question ID VK-090847