Types of sedimentation

Question 1

Name the five phases of settling

Answer 1

Discrete settling
Flocculant settling
hindered settling
Transition
Compaction settling

Question 2

Describe discrete settling

Answer 2

In discrete settling we have low concentration of solids where particles settles as individual particles without any interaction with each other. Mainly grit and sands settle dicretely.

Question 3

Describe Flocculant settling

Answer 3

Occurs when particles flocculate i.e particles build mass and settle as entities. Flocculant settling occurs at the in primary settling tank and in the upper portion of the secondary settling tank.

Question 4

Describe Hindered settling

Answer 4

In hindered settling we have intermediate concentration of solids in which the interparticle forces hinder the settling settling of neighboring particles. It occurs in secondary settling tanks.

Question 5

Describe compaction settling

Answer 5

In compaction settling we have high concentration of solids where it creates a surface and further settling occurs only by compaction. It occurs in the bottom of settling tanks and in sludge thickening facilities.

Question 6

Describe transition settling

Answer 6

Transition settling occurs between hindered settling and compaction settling, in transition settling some particles are near each other and some particles are in contact.

Question 7

Compare between Clay particles and Flocc particles

Answer 7

Clay particles have different sizes with same density whereas have both different sizes and different density

Question 8

continue with booklet

Answer 8

true (The Drawing)