Question

Choose the correct option to fill in the blanks.
I. Primary treatment of sewage involves physical removal of small and large particles through $A...$ and $\dots B\dots$
II. Microbes consume the major part of organic matter in the effluent and reduce $C...$ of sewage.
III. $D...$ particularly $E...$ anaerobically breakdown cellulosic material and produce $C{O}_2$ and $H_2$ from anaerobic sludge during $F...$ treatment.
IV. When $BOD$ of sewage has reduced, the effluent is passed into $G....$ Here, $A$ to $G$ can be

• A. A-sedimentation, B-centrifugation, C-BOD, D-Methanogen, E-Methanobacterium, F-water gas plant, G-settling tank
• B. A-centrifugation, B-sedimentation, C-BOD, D-Methanogen, E-Methanococcus, F-biogas plant, G-sludge tank
• C. A-filtration, B-centrifugation, C-BOD,D-Methanogen, E-Methanobacillus, F-gobar gas plant, G-filtre tank
• D. A-filtration, B-sedimentation, C-BOD,D-Methanogen, E-Methanobacterium, F-sewage treatment plant, G-settling tank

Answer 1

Answer: (D)

Correct answer is (d) A-filtration, B-sedimentation, C-BOD,D-Methanogen, E-Methanobacterium, F-sewage treatment plant, G-settling tank