Arrange the following STPs in correct sequence with regard to sewage treatment.

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Primary settling tank $\to$ Aeration tank $\to$ Settling tank $\to$ Anaerobic sludge digester

Aeration tank $\to$ Primary settling tank $\to$ Settling tank $\to$ Anaerobic sludge digester

Settling tank $\to$ Primary settling tank $\to$ Aeration tank $\to$ Anaerobic sludge digester

Aeration tank $\to$ Settling tank $\to$ Primary settling tank $\to$ Anaerobic sludge digester

answer is C.

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Detailed Solution

Primary settling tank $\to$ Aeration tank $\to$ Settling tank $\to$ Anaerobic sludge digester

The wastewater treatment process typically follows this sequence:

Primary settling tank: Heavy solid particles settle in this tank, forming primary sludge.
Aeration tank: Wastewater moves to this tank, where microorganisms break down organic pollutants with the help of oxygen.
Secondary settling tank: Microorganisms settle as activated sludge, and the treated water rises as effluent.
Anaerobic sludge digester: The collected sludge undergoes anaerobic digestion, producing biogas and stabilizing the sludge.

This process removes pollutants, making the water safe for discharge or reuse.

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