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Sewage Filtration

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

Courses › Waste Water Engineering › Sewage Filtration

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Chapter:

sewage-filtration (Click to view content)

1. While designing a pump for backwash for a filter what will be velocity assumed?

24 m/h 36m/h 30 m/h 20 m/h

24 m/h

The velocity of backwash pump is considered as 24m/h. This is in case of Dual media filter or Pressure sand filter. A horizontal centrifugal pump would be used as a backwash pump.

Hint Answer

2. What is surface area of plastic high specific surface area packing material used in trickling filters as packing medium?

60 m²/m³ 90 m²/m³ 140 m²/m³ 45 m²/m³

140 m²/m³

The surface area for plastic medium high specific surface area is about 140 m²/m³. This removes only Nitrogen. The void space is >94%.

Hint Answer

3. What does MLSS stand for?

Mixed Liquor Soluble Solvents Mixed Liquor Suspended solids Mixed Liquor Suspended Solvents Major Liquid Soluble Solids

Mixed Liquor Suspended solids

Liquor suspended solids (MLSS) that are broken up during transport from aeration basin to recombine can be used to design an enlarged flocculation zone. The larger floc that results will settle more effectively.

Hint Answer

4. For plastic type high filtration rate trickling filters what would be organic loading rate assumed?

0.07-0.22 kg BOD/m³d 0.24-0.48 kg BOD/m³d 0.5 kg BOD/m³d 0.6-3.2 kg BOD/m³d

0.6-3.2 kg BOD/m³d

For plastic type of high filtration rate trickling filters, organic load assumed is 0.6-3.2 kg BOD/m³d. Roughing rock type of trickling filter has a different organic loading rate. It is > 1.5 kg BOD/m³d.

Hint Answer

5. While designing a clariflocculator what is maximum limit velocity that is assumed?

1.5 m/h 2.0 m/h 3 m/h 3.5 m/h

2.0 m/h

While designing a clariflocculator, velocity assumed is 2.0 m/h. Based on this diameter arrives. Also, diameter for a clariflocculator would be greater compared to that of a HRSCC.

Hint Answer

6. As compression increases, porosity in filter bed _____

Increases Decreases Remains constant Alters

Decreases

As compression changes, porosity in filter bed also changes. The increase in compression results in smaller voids to capture smaller particles. Less compression leads to larger voids to capture larger particles.

Hint Answer

7. While designing an HRSCC what is Solid loading rate assumed for Clarification zone?

1 m/h 2 m/h 0.75 m/h 0.9 m/h

0.9 m/h

While designing an HRSCC, solid loading rate for clarification zone is assumed as 0.9 m/h. Area of clarification zone = Flow/Solid loading rate. From area, diameter for clarification zone is calculated.

Hint Answer

8. What is surface area of River rock (Large) packing material used in trickling filters as packing medium?

60 m²/m³ 90 m²/m³ 45 m²/m³ 150 m²/m³

45 m²/m³

The surface area for River rock (Large) packing material is about 45 m²/m³. This removes both Nitrogen and BOD. The void space is around 60%.

Hint Answer

9. What would happen if tube settler is inclined at an angle lesser than 45 degrees?

Solids will accumulate in the plates Efficiency Increases It becomes 100 percent efficient You don’t require a flocculator prior to it

Solids will accumulate in the plates

Usually tube settlers are inclined at an angle 45-60 degree. This is usually classified as secondary treatment. In case tube settlers are placed at an angle lesser than 45 degrees n this results in accumulation of solids between plates.

Hint Answer

10. What is depth of washing during high-rate water backwash?

3-4 mm 3-6 mm 2-3 mm 1-2 mm

3-6 mm

During high rates of backwashing by water depth of bed that usually is cleaned is 3-6 mm. 2-3 mm of depth is cleaned by air scour which is followed by low and high rates of water backwashing.

Hint Answer

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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 sewage-filtration consists of the following topics

Sewage Filtration

While designing a pump for backwash for a filter what will be velocity assumed?

What is surface area of plastic high specific surface area packing material used in trickling filters as packing medium?

What does MLSS stand for?

For plastic type high filtration rate trickling filters what would be organic loading rate assumed?

While designing a clariflocculator what is maximum limit velocity that is assumed?

As compression increases, porosity in filter bed _____

While designing an HRSCC what is Solid loading rate assumed for Clarification zone?

What is surface area of River rock (Large) packing material used in trickling filters as packing medium?

What would happen if tube settler is inclined at an angle lesser than 45 degrees?

What is depth of washing during high-rate water backwash?

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