Sedimentation

When impurities are separated by the gravitation of settling particles, the operation is called _____

• Sedimentation with coagulant

• Plain sedimentation

• Secondary sedimentation

• Disinfection

In which type of settling, sedimentation of discrete particles takes place?

• Zone settling

• Compression settling

• Hindered settling

• Discrete settling

In which settling type, dilute suspension of particles takes place?

• Zone settling

• Compression settling

• Discreet settling

• Hindered settling

The time period for which the water is stored in a sedimentation tank is called _____

• Time of flow

• Settling time

• Detention time

• overflow time

In Sedimentation aided with coagulation the particels are removed by gravitational flow only

• True

• False

The principle of sedimentation is based on

• Sepration of suspended particles

• Reduction of velocity

• Maintaining same velocity

• Allowing water to retain for longer period

Baffle walls are used to

• separate the liquids & solids

• combine liquids & solids

• reduce the flow velocity

• act as boundaries for sedimentation

The quantity of water flowing per hour per unit horizontal area is called ________

• Detention time

• flow time

• over flow rate

• displacement time

In radial flow type tank water is allowed from bottom of tank

• True

• False

The sedimentation basin should be made as deep as possible

• True

• False