(i) Wastewater is passed into sedimentation tank. |
(ii) Sludge is decomposed by anaerobic bacteria. |
(iii) Wastewater is passed through bar screens. |
(iv) Wastewater is passed to grit and sand removal tank. |
(v) Solids settle at the bottom and floatable materials are removed by skimmer. |
(vi) Aeration of water takes place. |
(vii) Disinfection of water by adding chlorine. |
A) (iii)\[\to \](iv)\[\to \](i) \[\to \](v)\[\to \](ii)\[\to \](vi)\[\to \](vii)
B) (iv)\[\to \](iii)\[\to \](i)\[\to \](v)\[\to \](ii)\[\to \](vi)\[\to \](vii)
C) (iii)\[\to \](iv)\[\to \](v)\[\to \](i)\[\to \](ii)\[\to \](vi) \[\to \](vii)
D) (iii)\[\to \] (iv)\[\to \] (i)\[\to \](ii)\[\to \](v)\[\to \](vi)\[\to \] (vii)
Correct Answer: A
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