Which of the following statements is incorrec | vedclass

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(D) Sewage treatment involves several stages:$1$. Primary treatment involves physical removal of particles through filtration and sedimentation. Float

Vedclass · Accepted Answer

The $BOD$ (Biochemical Oxygen Demand) of the sewage increases during treatment.

Vedclass · Answer

(D) Sewage treatment involves several stages:$1$. Primary treatment involves physical removal of particles through filtration and sedimentation. Floating debris is removed by sequential filtration,and grit is removed by sedimentation.$2$. Secondary treatment or biological treatment involves the growth of aerobic microbes into flocs (masses of bacteria associated with fungal filaments).$3$. The primary objective of sewage treatment is to reduce the $BOD$ of the wastewater. $BOD$ refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria. During the treatment process,microbes consume the organic matter,thereby significantly decreasing the $BOD$ of the effluent before it is released into water bodies.$4$. Therefore,the statement that $BOD$ increases during treatment is incorrect.

Which of the following statements is incorrect regarding sewage treatment?

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