Read the following statements regarding wastewater treatment plant. Select the option that correctly completes any two statements.
(i) ________ remove large solid materials from the wastewater and allow it to go into an ________.
(ii) The solid waste called ________ sinks slowly at the bottom and is continuously removed by ________.
(iii) The clarified water is passed into ________ which contains aerobic bacteria.
(iv) The suspended microbes settle down at the bottom as ________ and ________ is used as manure.
A(i) - Bar screens, Aeration tank; (ii) Sludge, Skimmer
B(ii) - Sludge, Scrapers; (iii) Aeration tank
C(iii) - Grit and sand removal tank; (iv) - Dried
sludge, Activated sludge
D(i) - Bar screens, Aeration tank; (iv) - Activated sludge, Dried sludge