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EXAM PREPARATION

Objective Question & Answer

QUESTION

Objective Question

Q.1
Consider the following statements:

1. Primary sludge is to be treated with an aerobic digester.

2. Secondary sludge is the living biomass.

3. Sludge volume gets decreased with increase in water content of sludge.

4. Sludge consists of higher solids content than the moisture content.

Which of these statements is/are correct

A
1 and 4
B
2 and 3
C

2 only

D
3 and 4
Answer ( Option C)

2 only

Solution

Sludge characteristics and treatment dynamics are governed by biological classification, fluid mechanics, and

volumetric mass relationships.

Secondary sludge is composed primarily of the living biomass generated during biological treatment stages (like the activated sludge process). Microorganisms feed on the dissolved organic material in aeration tanks, multiplying and aggregating into active microbial flocs that subsequently settle out in the secondary
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