Rohan & his friends visited sewage treatment plant and he observed – sewage treatment tanks & its products.

Rohan observed – “Dark brown to black colour substance which contains large quantities of gases. On drying the sludge, the gases are escaped” from the above shown tank, Identify the type of sludge.

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Primary sludge

Clostridium perfingers

Anaerobically digested sludge

Scum

answer is D.

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Detailed Solution

During Biological treatment, the effluent is transferred to aeration tanks to form flocs & reduce the BOD levels in the sewage. Later we obtained the mixture of Bacteria & filamentous fungi in the tank – referred as activated sludge.

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