What does primary sludge consist of?

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(D) In the process of sewage treatment,the primary treatment involves physical removal of particles through filtration and sedimentation. $1$. Floatin

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All of the above

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(D) In the process of sewage treatment,the primary treatment involves physical removal of particles through filtration and sedimentation. $1$. Floating debris is removed by sequential filtration. $2$. Grit (soil and small pebbles) is removed by sedimentation. $3$. All these solids that settle down during primary treatment are collectively called primary sludge.

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