Which of the following statement is/are correct in the context of treatment of sewage?
I. Primary treatment consists of removing large suspended organic solids.
II. After primary treatment secondary treatment involves further treatment of the effluent, coming from the primary
sedimentation tank.
Statement I is correct: Primary treatment is a physical process designed to remove large floating debris and
suspended organic and inorganic solids through sequential filtration and sedimentation
Statement II is correct: The liquid portion that remains after primary sedimentation is known as the primary effluent.
This effluent is then transferred directly into secondary treatment units (such as aeration tanks or trickling filters) for
biological decomposition.
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