In context of secondary treatment of sewage, ‘flocs’ is associated with which microbes?
[A] Bacteria and algae
[B] Algae and fungus
[C] Fungi and bacteria
[D] Fungi and lichen
What is BOD?
[A] Bacterial Oxygen Demand
[B] Biological Organic Debris
[C] Biochemical Organic Demand
[D] Biochemical Oxygen Demand
The ‘floes’ present in large aeration tanks causes ______ in BOD.
[C] no change
[D] Either (a) or (b)
BOD can be defined as:
[A] Amount of CO2 consumed if all the inorganic matter in one litre of water is oxidized by bacteria.
[B] Amount of O2 consumed if all the organic matter in one decilitre of water is reduced by bacteria.
[C] Amount of O2 consumed if all the organic matter in one litre of water is oxidized by bacteria.
[D] Amount of O2 consumed if all the inorganic matter in one litre of water is oxidized by bacteria.
BOD is the measure of ______ in water.
[A] organic matter
[B] inorganic matter
[C] bacterial load
BOD ______ polluting potential of waste water.
[A] is not proportional to
[B] is directly proportional to
[C] is inversely proportional to
[D] None of the above
Once BOD from the sewage is reduced significantly, the ‘floes’ are allowed to sediment and it is known as ______.
[A] Primary Sludge
[B] Secondary Sludge
[C] Activated Sludge
[D] Inactivated Sludge
Assertion (A): A small part of activated sludge is pumped back into aeration tank.
Reason (R): It serves as inoculum.
[A] A is true but R is false.
[B] A is true and R is correct explanation for A.
[C] A is false but R is true.
[D] Both A and R is false.
The remaining major part of activated sludge is pumped into large tanks called _____
[A] Aerobic fermenters
[B] Anaerobic fermenters
[C] Aerobic Sludge digesters
[D] Anaerobic Sludge digesters
In an anaerobic sludge digester, anaerobically digesting bacteria digest which microbes?
[D] Both (a) and (b)
In an anaerobic sludge digester, during the digestion process, mixture of gases like ____ are produced.
[A] CH4, H2 O, O2
[B] C2 H6H2S, CO2
[C] CH4, H2O2, CO2
[D] CH4, H2S, CO2
The gases that evolve from anaerobic sludge digester constitute ______
[A] Natural gas
[C] Water gas
[D] None of the above
After secondary treatment, the effluent is released into:
[A] Digester tank
[B] Filtration Unit
[C] Water bodies
[D] Chemical treatment unit
Which ministry has initiated Ganga Action Plan and Yamuna Action Plan?
[A] Ministry of Chemicals and Fertilizers
[B] Ministry of Health and Family Welfare
[C] Ministry of Community Health and Diseases
[D] Ministry of Environment and Forest
Which gas is the main constituent of biogas?
[A] H2 S
[C] C2 H6
[D] C3 H8