Design of septic tank requires consideration of space for the following item(s).
Show Hint
- Settling of incoming sewage
- Storage of digested sludge
- Installation of liner to allow seepage of effluent
- Digestion of the settled sludge
The Correct Option is A, B, D
Solution and Explanation
Step 1: Function of septic tank.
A septic tank is designed to collect sewage, allow settling of solids, and partially digest organic matter through anaerobic action.
Step 2: Requirements of space.
- (A) Correct → Space for settling of incoming sewage is essential, where heavier solids settle to the bottom. ✓
- (B) Correct → Septic tanks must provide storage for sludge that accumulates over time. ✓
- (C) Wrong → Tanks are watertight; liners do not allow effluent seepage (that happens in soak pits, not septic tanks). ✗
- (D) Correct → Space for anaerobic digestion of sludge must be provided. ✓
Step 3: Conclusion.
The correct considerations are (A), (B), and (D).
Final Answer: \[ \boxed{\text{(A), (B), and (D)}} \]
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