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BOD Removal Methods & Miscellaneous Methods

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

Courses › Waste Water Engineering › BOD Removal Methods & Miscellaneous Methods

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1. MBBR needs an assistance to maintain biofilm.

True False

False

This technology provides cost-effective treatment with minimal maintenance since MBBR processes self-maintain an optimum level of productive biofilm.

Hint Answer

2. The one tank is aerating and filling while or one is decant.

True False

True

The tanks have a ?flow through? system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out of or. One tank is in settle/decant mode or is aerating and filling in multiple tank systems.

Hint Answer

3. What is diameter of cylinder?

5 mm 7.5 mm 10 mm 12 mm

10 mm

The cylinder has a diameter of 10 mm (not including fins) and a length of 7 mm. A larger carrier of similar shape was introduced, intended for use in plants with coarse inlet sieves.

Hint Answer

4. Which of following is a disadvantage of MBR?

Catalyst regeneration Flow characteristics Catalyst cost Heat transfer

Heat transfer

In moving bed reactor, flow of solids is not easy to maintain and solid distribution is also difficult. It consists of poor heat transfer characteristics. The fluid reactant may bypass catalyst bed.

Hint Answer

5. Ice mats _____ oxygen transfer surface.

Alter Increase Reduce Maintain

Reduce

Algal respiration can require additional oxygen during darkness but algae can provide surface oxygen during daylight hours. Ice or scum mats can reduce oxygen transfer surface.

Hint Answer

6. Oxidation ditch uses __ to remove biodegradable organics.

Long SRTs Short SRTs pH chemicals

Long SRTs

Long solids retention times (SRTs) are used by oxidation ditch to remove biodegradable organics. The typical oxidation ditch is equipped with aeration rotors or brushes that provide aeration and circulation.

Hint Answer

7. ______ is used to remove phosphorus compounds from liquor.

Aluminium nitrate Aluminium phosphate Aluminium sulphate Sodium nitrate

Aluminium sulphate

To remove phosphorus compounds from liquor, aluminium sulphate (alum) is often added during this period. It reacts to form non-soluble compounds, which settle into sludge in next stage.

Hint Answer

8. What is outlet of TSS in ppm obtained when aerated lagoons are used for treatment?

500-700 100-400 700-900 900-1200

100-400

In treated water, TSS should be <1200ppm. When aerated lagoons are used for treatment, TSS obtained is 100-400 ppm. This method also reduces BOD.

Hint Answer

9. What is efficiency in reducing BOD of a tank consisting f Biox media

90% 80% 85% 95%

90%

The efficiency in reducing BOD of a tank consisting of Biox media is 90 %. In normal activated sludge process this is around 70%. These media also reduce SRT of tank when compared to conventional Activated sludge process.

Hint Answer

10. What is shape of oxidation ditch?

Square Rectangular Circular Oval

Oval

An oxidation ditch is a large holding tank in a continuous ditch with an oval shape similar to that of a racetrack. The ditch is built on surface of ground and is lined with an impermeable lining.

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 bod-removal-methods-miscellaneous-methods consists of the following topics

BOD Removal Methods & Miscellaneous Methods

MBBR needs an assistance to maintain biofilm.

The one tank is aerating and filling while or one is decant.

What is diameter of cylinder?

Which of following is a disadvantage of MBR?

Ice mats _____ oxygen transfer surface.

Oxidation ditch uses __ to remove biodegradable organics.

______ is used to remove phosphorus compounds from liquor.

What is outlet of TSS in ppm obtained when aerated lagoons are used for treatment?

What is efficiency in reducing BOD of a tank consisting f Biox media

What is shape of oxidation ditch?

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