GATE CE 2026 Set 2 — Question 28
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Environmental Engineering → Effluent & Sludge Management → Sludge Digestion
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Question
One-third of the solid matter in a sludge containing water is composed of fixed mineral solids with specific gravity , and two-third is composed of volatile solids with specific gravity .
Specific gravity of all solids lies between
Specific gravity of all solids lies between
Correct answer
(A) 1.2 and 1.3
Solution
The average specific gravity of solids () is calculated using the mass fractions of its components:Where:
- (mass fraction of fixed solids)
- (specific gravity of fixed solids)
- (mass fraction of volatile solids)
- (specific gravity of volatile solids)
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