# Sedimentation and Chemical Clarification

This set of MCQs helps students to learn about sedimentation which is the process by which suspended particles are removed from the water by means of gravity or separation. and chemical clarification are physical water treatment processes using gravity or buoyancy to remove suspended solids from water. Solid particles entrained by the turbulence of moving water may be removed naturally by sedimentation in the still water of lakes and oceans.

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How many types of settling are there in the sedimentation tank?

3 4 5 6

In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?

Flocculent settling Hindered settling Compression settling Discrete settling

_______ is formed when alum is added to sewage.

Acid Floc Salt Base

How many types of sedimentation tanks are there on the basis of the method of operation?

2 3 4 5

In which type of sedimentation, the flocculent suspension of the intermediate concentration takes place?

Type I sedimentation Type II sedimentation Type III sedimentation Type IV sedimentation

In which type of sedimentation, the flocculent suspension of high concentration takes place?

Type I sedimentation Type II sedimentation Type III sedimentation Type IV sedimentation

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

Sedimentation with coagulant Plain sedimentation Secondary sedimentation Disinfection

What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10-3cm. Given G=2.65, viscosity v=8 * 10-3cm2/Sec?

0.01cm/Sec 0.13cm/Sec 0.24cm/Sec 0.36cm/Sec

In the expression vS = 1.8 (g*d (G-1))1/2, the diameter of spherical particle is ____________.

0.1mm

< 0.1mm

1mm

>1mm

The settling velocity of spherical particle is given by ____________.

Darcy Weisbach equation

Hazen and William equation

Stokes equation

Bernoulli’s equation

Quiz/Test Summary
Title: Sedimentation and Chemical Clarification
Questions: 10
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