HARD
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IMPORTANT
Earn 100
Refer the given flowchart of sewage treatment, accordingly match Column I with Column II and select the correct answer from the codes given below
Column-I
Column-II
A.
The stage in which physical treatment of sewage is done
(i)
Anaerobic digestion of activated sludge and production of biogas
B.
The stage in which biological treatment of sewage is done
(ii)
Activated sludge
C.
Name of the sediment in primary treatment
(iii)
Aeration tanks
D.
It is carried to aeration tanks from primary settling
(iv)
Primary effluent
E.
Name of the sediment in secondary treatment
(v)
Primary sludge
F.
Site of flocs growth
(vi)
Secondary treatment
G.
Function of sludge digester
(vii)
Primary treatment
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Important Questions on Microbes in Human Welfare
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Study the following statements and select the incorrect ones.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas commonly called gobar gas is pure methane.
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Integrated Pest Management (IPM) discourages the excessive use of
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'Flocs' refer to:
