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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. Which of se has been used as a medium for high rate filtration?

Polyvaniladene Polypropylene Polyacetylene Polyvinyl

Polyvaniladene

Polyvaniladene has been used as a medium in case of high rate filtration. This is a syntic medium. This is highly porous.

Hint Answer

2. What is angle of slope in tube settlers?

30˚ 60˚ 90˚ 180˚

60˚

Tube settlers use multiple tubular channels sloped at an angle of 60� and adjacent to each or, which combine to form an increased effective settling area. This provides for a particle settling depth that is significantly less than settling depth of a conventional clarifier, reducing settling times.

Hint Answer

3. Filter cycle is interrupted for __

Air washing Back washing Adding influent Removing effluent

Air washing

Filtration cycle is interrupted for air washing when filter resistance through filter media reaches terminal filtration.

Hint Answer

4. Which of se represent settling velocity of tubesettlers?

11-15 m²/mm³ 20-25 m²/mm² 40-45 m²/mm² 30-35 m²/mm²

11-15 m²/mm³

The surface loading rate of tube settlers is 11-15 m²/mm². Based on this area required is calculated. Also number of tube settlers is n calculated.

Hint Answer

5. In which type of trickling filter very high power is consumed?

Low or standard filtration rate(Rock type) Intermediate filtration rate (Rock type) High filtration rate (Rock type) Roughing (Plastic/Rock type)

Roughing (Plastic/Rock type)

Depending on packing material for trickling filters it has been classified into 2 types. Rock and plastic type. The roughing type trickling filter which can constitute eir rock or plastic packing consumes highest power. This is around 10-20 KW/ 10³m³.

Hint Answer

6. What does SSCC stand for?

Spiral scraper clarifier type Suction header clarifier type Up-flow pipe clarifier type Perimeter feed clarifier

Spiral scraper clarifier type

SSCC stands for Spiral Scraper Clarifier type. SHSC stands for Suction Header Clarifier type. Up-flow Pipe Clarifier type. PIBC stands for Perimeter Feed Clarifier type.

Hint Answer

7. For rock type of packing in intermediate filtration trickling filters what is hydraulic rate considered?

4-10 m³/m².d 10-15 m³/m².d 20-25 m³/m².d 25-30 m³/m².d

4-10 m³/m².d

For rock type packing in intermediate filtration trickling type filters, hydraulic rate considered is 4-10 m³/m².d. In case of high filtration rock type trickling filters packing it is considered as 10-75 m³/m².d. For plastic packing type in trickling filters, hydraulic rate is different.

Hint Answer

8. Trickling filter can also be called as a biofilter.

True False

True

The systems like trickling filter and biofilter have also been described as roughing filters, intermittent filters, packed media bed filters, alternative septic systems, percolating filters, attached growth processes, and fixed film processes.

Hint Answer

9. Which of se require a flash mixer prior to it?

High rate solid contact clarifier Clariflocculator Secondary clarifier Dissolved aeration flotation

Clariflocculator

A clariflocculator requires a flash mixer prior to it. A clarifier requires both a flash mixer and flocculator prior to it. Clarifiers are used to remove suspended solids.

Hint Answer

10. What is bed depth of sand considered in such rapid filters?

500 mm 200- 400 mm 600-760 mm 900- 1000 mm

600-760 mm

The bed depth is considered as 600-760 mm. The depth for gravels is considered as 400-600 mm. These are assumptions made while designing a rapid sand filtration.

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

Which of se has been used as a medium for high rate filtration?

What is angle of slope in tube settlers?

Filter cycle is interrupted for __

Which of se represent settling velocity of tubesettlers?

In which type of trickling filter very high power is consumed?

What does SSCC stand for?

For rock type of packing in intermediate filtration trickling filters what is hydraulic rate considered?

Trickling filter can also be called as a biofilter.

Which of se require a flash mixer prior to it?

What is bed depth of sand considered in such rapid filters?

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