Which of the following does not occur when se | vedclass

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(A) When sewage is discharged into water bodies,it introduces organic matter and nutrients like nitrogen and phosphorus. $1$. The organic matter is de

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Increase in $O_2$

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(A) When sewage is discharged into water bodies,it introduces organic matter and nutrients like nitrogen and phosphorus. $1$. The organic matter is decomposed by microorganisms,which consume dissolved oxygen,leading to a depletion of $O_2$ levels. $2$. The excess nutrients promote the growth of algae,leading to algal blooms (often Cyanophycean blooms). $3$. This process of nutrient enrichment and subsequent biological changes is known as eutrophication. $4$. Therefore,the discharge of sewage leads to a decrease in $O_2$,not an increase.

Which of the following does not occur when sewage is discharged into water bodies?

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