Very fine suspended and colloidal impurities are removed from water by a process called

Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

A

Sedimentation tank

B

Circular clarifier

C

Mechanical flocculation

D

Chemical coagulation

Most widely and commonly used coagulant for the removal of suspended impurities in water is

A

Bleaching powder

B

Slaked lime

C

Alum

D

Copper sulphate

The most widely used coagulant for removing suspended impurities from water is

A

Bleaching powder

B

Chlorine

C

Calcium sulphate

D

Alum

In large thermal power stations very fine particulates present in flue gas are removed by

A

Wet scrubber

B

Bag filter

C

Electrostatic precipitators

D

Dust catcher

When the body is suspended at the point of suspension, its periodic time and frequency will be ________ as compared to the body suspended at the point of percussion.

A

Same

B

Two times

C

Four times

D

None of these

Impurities present in brine is normally removed by treatment with

A

NH₃ and CO₂

B

Lime and soda ash

C

Lime, ammonia and carbon

D

All of the above

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

A

Chemical coagulation

B

Floatation & skimming

C

Centrifugation

D

Ultrafiltration

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

A

Biological oxygen pond

B

Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

C

Lagoons

D

Filtration

A substance which readily forms colloidal solution in contact with water is called

A

Extrinsic colloid

B

Associated colloid

C

Hydrophobic colloid

D

Hydrophilic colloid

The process by which fine solids is removed from liquids is termed as

A

Decantation

B

Flocculation

C

Sedimentation

D

Classification

Very fine suspended and colloidal impurities are removed from water by a process called

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