Read the following and answer questions from \( 9(\mathrm{i}) \) to \( 9(\mathrm{v}) \). In a s...
0Read the following and answer questions from \( 9(\mathrm{i}) \) to \( 9(\mathrm{v}) \).
In a sewage treatment plant, sludge was subjected to treatments : X, Y and Z. Filtration and sedimentation occur at \( \mathrm{X} \). The sedimented part is called primary sludge. The liquid so produced including sludge and supernatant is ' \( A \) '. In treatment ' \( \mathrm{Y} \) ' the liquid ' \( \mathrm{A} \) ' is mechanically agitated. In treatment ' \( \mathrm{Z} \) ' all nitrates and phosphates were removed. In one of the treatment steps maximum trapping of debris occurs. In another treatment microbes form a mass called 'B' with bacteria held with slime and fungal filaments. Product ' \( \mathrm{C} \) ' is produced by bacteria which is used as a source of energy.
Which of the following is correct about ' \( \mathrm{B} \) '?
(A) 'B' represents flocs.
(B) ' \( \mathrm{B} \) ' is produced during primary treatment of sludge.
(C) 'B' is produced during secondary treatment of sludge.
(D) Both (a) and (c).
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