What happens in anaerobic sludge digester? (A) Anaerobic bacteria digest the bacteria and fungi in the sludge (B) Aerobic bacteria digest the bacteria and fungi in the sludge (C) Methane and Carbon dioxide is produced (D) Methane and Nitrogen dioxide is produced Choose the correct answer from the options given below : (

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(B) and (D)

(A) and (C)

(A), (B) and (D)

(A), (B) and (C)

Correct Answer

(A) and (C)

Detailed Explanation

In anaerobic sludge digesters other kinds of bacteria, which grow anaerobically, digest the bacteria and the fungi in the sludge. During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as source of energy as it is inflammable.