Correct option is B
A septic tank is a structure used to store and treat wastewater from toilets in areas where a public drainage or sewer system is not available. It is a self-contained system that separates solid waste from liquid waste and allows the liquid effluent to drain into a soak pit or leach field.
1. Overhead Tank:
Used for storing clean water for domestic or industrial use, not for wastewater.
2. Septic Tank:
Correct. It is a small-scale sewage treatment system used to store and partially treat waste from toilets.
3. Sump:
Refers to a pit or reservoir used for collecting and storing water, typically for rainwater or drainage, not specifically for wastewater.
4. Storage Tank:
A general term for a tank used to store water or other liquids, but it is not specifically designed for treating wastewater.
