Water Treatment

Question: Secondary treatment uses __________ to consume wastes.
[A].

micro-organisms

[B].

chemicals

[C].

filtration

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following chemical is sometime added in the process of coagulation and flocculation?
[A].

Aluminum sulphate

[B].

Aluminum oxide

[C].

Calcium chloride

[D].

None of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Sedimentation is a physical process used in wastewater treatment to
[A].

remove particles that are less dense than water

[B].

remove particles that are more dense than water

[C].

remove the pertinacious material from the water

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: The common methods used for disinfection in waste water treatment plants are
[A].

chlorination

[B].

UV light

[C].

both (a) and (b)

[D].

Phenolic solvent

Answer: Option C

Explanation:

No answer description available for this question.

Question: The chemical oxygen demand (COD)measures the
[A].

amount of oxygen required for growth of microorganisms in water

[B].

amount of oxygen that would be removed from the water in order to oxidize pollution

[C].

amount of oxygen required to oxidize the calcium present in waste water

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: The water being used in dairy industry should contain not more than
[A].

5 proteolytic and/or lipolytic organisms per ml

[B].

10 proteolytic and/or lipolytic organisms per ml

[C].

15 proteolytic and/or lipolytic organisms per ml

[D].

20 proteolytic and/or lipolytic organisms/ml

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coliform bacteria in water is an indication of the presence of
[A].

radioactive wastes

[B].

excess fertilizer

[C].

decaying animals and plants

[D].

human feces

Answer: Option D

Explanation:

No answer description available for this question.

Question: Lagoons may be characterized as
[A].

anaerobic

[B].

facultative

[C].

aerated

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: The activated sludge process is sometime referred as
[A].

fluid bed biological oxidation system

[B].

fixed bed biological oxidation system

[C].

turning bed biological oxidation system

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: The activated sludge process consists of returning a portion of the clarifier
[A].

effluent water entering the reactor

[B].

influent water coming out of the reactor

[C].

influent water entering the reactor

[D].

effluent water coming out of the reactor

Answer: Option C

Explanation:

No answer description available for this question.