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Preliminary Treatment

Course: Waste Water Engineering — Practice MCQs, solutions, formulas & past entrance questions.

Courses › Waste Water Engineering › Preliminary Treatment

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Chapter:

preliminary-treatment (Click to view content)

1. Aerated grit chambers are usually designed to remove particles in which range of size?

0.1mm diameter 0.35 mm diameter 0.21 mm diameter 0.41 mm diameter

0.21 mm diameter

The aerated grit chambers are designed to remove particles in range 0.21mm diameter. The cross section of se tanks is similar to that of an activated sludge process tank. The only difference is that se chambers have hoppers of about 0.9m in depth.

Hint Answer

2. What is specific gravity of settleable particles in grit chamber?

2.98 2.56 2.65 2.89

2.65

The specific gravity of heavier particles is 2.65. Grit chambers are nothing but like sedimentation tanks, designed to separate intended heavier inorganic materials (specific gravity about 2.65) and to pass forward lighter organic materials.

Hint Answer

3. Lower velocity through screen, ____ is amount of screening that would be removed.

Lower Greater Lesser Stronger

Greater

The velocity of flow ahead of and through a screen varies materially and affects its operation. Lower velocity through screen, greater is amount of screening that would be removed.

Hint Answer

4. Which of se screens is used to remove secondary suspended solids?

Medium drum rotary screen Fine drum rotary screen Tangential fine screen Horizontal reciprocating screen

Fine drum rotary screen

Fine drum rotary screens are used to remove secondary suspended solids. The mesh is generally made up of stainless steel. The screen cloth would be polyester material.

Hint Answer

5. What is headloss through a communitor?

0.3-0.4 m 0.1-0.3 m 0.5-0.6 m 0.6-0.7 m

0.1-0.3 m

The headloss through communitor is 0.1-0.3m. In large units it can approach 0.9m. These may be preceded by grit chambers.

Hint Answer

6. Grit chamber is similar to which of following?

Screening unit Sedimentation tank Coagulation tank Sand bed

Sedimentation tank

Sedimentation tanks and grit chambers are similar, designed to separate intended heavier inorganic materials (specific gravity about 2.65) and to pass forward lighter organic materials.

Hint Answer

7. At what angle generally a coarse manual screen is placed?

60 degree 50 degree 65-70 degree 30-45 degree

30-45 degree

The coarse screens are generally placed at 30-45 degree. This holds good only for a manual screen. For a mechanical screen angle is between 0-30 degrees.

Hint Answer

8. In drum type screen, which axis does drum rotate?

Horizontal Vertical Irregular Horizo-vertical

Horizontal

The drum-type screen consists of a cylinder covered by a screen cloth with drum rotating on a horizontal axis, slightly less than half submerged. Wastewater enters inside of drum at one end and flows outward through screen cloth.

Hint Answer

9. What is approach velocity for grit bearing wastewaters?

0.2-0.3 m/s 0.6-0.75 m/s 0.5-0.75 m/s 0.45-0.60 m/s

0.6-0.75 m/s

The approach velocity of 0.6 to 0.75 m/sec for grit bearing wastewaters is suggested. Accordingly, bed slope of channel should be adjusted to develop this velocity.

Hint Answer

10. Which of se is not a grit removal equipment installed in aerated grit chamber?

Screw conveyers Tubular conveyers Jet pumps Communitors

Communitors

Communitors are used to grind materials. These are prior to a screen. Screw conveyers, tubular conveyers and jet pumps are used to remove grit.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Waste-Water-Engineering

Wastewater Flow Rates, Collection and Conveyance of Sewage

Wastewater Flow Rates, Collection and Conveyance of Sewage

Hydraulic Design & Construction of Sewers

Hydraulic Design & Construction of Sewers

Sewer Appurtenances & Sewage Pumping

Sewer Appurtenances & Sewage Pumping

Valves, Blowers & Wastewater Characteristics

Valves, Blowers & Wastewater Characteristics

Natural Methods of Wastewater Disposal, Chemical Reaction Engineering and Waste Water Treatment

Natural Methods of Wastewater Disposal, Chemical Reaction Engineering and Waste Water Treatment

Unit Operations for Wastewater Treatment

Unit Operations for Wastewater Treatment

Preliminary Treatment

Preliminary Treatment

Types of Settling Tank

Types of Settling Tank

Sewage Filtration

Sewage Filtration

Activated Sludge Process

Activated Sludge Process

BOD Removal Methods & Miscellaneous Methods

BOD Removal Methods & Miscellaneous Methods

Treatment and Disposal of Sludge

Treatment and Disposal of Sludge

Septic Tanks, Oil and Grease Removal

Septic Tanks, Oil and Grease Removal

Advanced Wastewater Treatment

Advanced Wastewater Treatment

House Drainage

Rural Sanitation

Rural Sanitation

Corrosion control & Instrumentation

Corrosion control & Instrumentation

Topics

This Chapter preliminary-treatment consists of the following topics

Preliminary Treatment

Aerated grit chambers are usually designed to remove particles in which range of size?

What is specific gravity of settleable particles in grit chamber?

Lower velocity through screen, ____ is amount of screening that would be removed.

Which of se screens is used to remove secondary suspended solids?

What is headloss through a communitor?

Grit chamber is similar to which of following?

At what angle generally a coarse manual screen is placed?

In drum type screen, which axis does drum rotate?

What is approach velocity for grit bearing wastewaters?

Which of se is not a grit removal equipment installed in aerated grit chamber?

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