TGPSC HMWSSB Manager 2015 Paper 2 · Question 88

Question 88 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q88 · Environmental Engineering · Sewerage & Wastewater Treatment

   Recirculation in activated sludge process is done to

   1. Dilute the incoming sewage
   2. Dampen the effect of the flow variation
   3. Operate the plant continuously
   4. Supply seed materials to the aeration tank
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   Answer: (4) Supply seed materials to the aeration tank

   Part of the settled sludge from the secondary clarifier is returned to the aeration tank so that the incoming sewage is seeded with an active population of acclimatised micro-organisms, keeping the MLSS at the required level.

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