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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. For rock type low filtration rate trickling filters what would be depth assumed while designing it?

1.8-2.4 m <1.8 m 3-12.2 m >12.2 m

1.8-2.4 m

For rock type low filtration, depth assumed is around 1.8-2.4 m while designing it. It is assumed as 1.8-2.4 m even for intermediate filtration. It is assumed as 1.8-2.4 m for high rate filtration trickling filters also.

Hint Answer

2. What is TSS at outlet of Pressure Sand Filter (PSF)?

<10 ppm 25 ppm 100 ppm >150 ppm

<10 ppm

At outlet of filter TSS is <10 ppm. In case of Side stream filter, we can get an outlet of <5ppm. In case of Dual Media Filter we can get an outlet of <1ppm.

Hint Answer

3. Which of se is most efficient?

High rate solid contact clarifier Primary clarifier Clariflocculator Tube settler

High rate solid contact clarifier

High rate solid contact clarifier is most efficient. It removes around 97% of suspended solids present in waste water. The capital cost for same is very high.

Hint Answer

4. When filled which of following material only nitrogen is removed?

River rock (Large) River rock (Small) Plastic conventional Plastic random packing-conventional

River rock (Small)

The trickling filters usually constitute rock or plastic packing. The trickling filters remove BOD/ nitrogen. When it is filled only with River rock (small) n it was noticed that only nitrogen was removed by oxidizing ammonia nitrogen to nitrite and nitrate.

Hint Answer

5. Orifice placement is critical to successful operation of clarifier.

True False

True

Proper design of suction header (header geometry as well as orifice placement and sizing) is critical to successful operation of clarifier.

Hint Answer

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

60 m²/m³ 90 m²/m³ 98 m²/m³ 150 m²/m³

150 m²/m³

The surface area for plastic random packing high specific area is about 150 m²/m³. This removes only Nitrogen. The void space is around 70%.

Hint Answer

7. Tube settlers are operated in which mode?

Concurrent Countercurrent Cross flow Hindered settling

Countercurrent

Tube settlers are operated in a countercurrent mode. The water is passed from bottom and flows upwards and exists from basin above modules. The solids that settle within tube settle down due to gravity.

Hint Answer

8. What is percentage of wash water?

>5% >3% >2% <2%

<2%

The wash time is 30 minutes. The filter must be cleaned for every 8-24 hours. The wash water volume is less than 2% of total volume of water used for purpose.

Hint Answer

9. While designing an HRSCC what is detention time assumed for draft tube?

60 secs 90 secs 120 secs 150 secs

60 secs

While designing an HRSCC, detention time assumed for draft tube is around 60 secs. Based on detention time and flow rate of water, volume of draft tube is calculated. From this and height, area is calculated.

Hint Answer

10. What is surface area of plastic random packing conventional packing material used in trickling filters as packing medium?

60 m²/m³ 90 m²/m³ 98 m²/m³ 150 m²/m³

98 m²/m³

The surface area for plastic random packing of conventional type packing material is about 98 m²/m³. This removes both Nitrogen and BOD. The void space is around 80%.

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

For rock type low filtration rate trickling filters what would be depth assumed while designing it?

What is TSS at outlet of Pressure Sand Filter (PSF)?

Which of se is most efficient?

When filled which of following material only nitrogen is removed?

Orifice placement is critical to successful operation of clarifier.

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

Tube settlers are operated in which mode?

What is percentage of wash water?

While designing an HRSCC what is detention time assumed for draft tube?

What is surface area of plastic random packing conventional packing material used in trickling filters as packing medium?

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