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Chapter:

BOD-Removal-Methods-

1. The diameter of impeller is usually 1/3 rd of vessel diameter.

True False

True

The diameter of impeller is usually 1/3 rd of vessel diameter. The distance between two impellers is approximately 1.2 impeller diameter. Different types of impellers (Rustom disc, concave bladed, marine propeller etc.) are in use.

Hint Answer

2. Which type of reactor is not subjected to back mixing?

Plug flow Completely stirred reactor Batch reactors Venturi reactor

Plug flow

Plug flow reactors are not subjected to back mixing. They are designed for a specific detention time. Disinfection of water is carried out in a plug flow reactor.

Hint Answer

3. Which of following methods are used in rural communities?

Aerobic digestion Mechanical dewatering Dewatering Composting

Composting

Air-drying and composting may be attractive to rural communities, while limited land availability may make aerobic digestion and mechanical dewatering preferable for cities, and economies of scale may encourage energy recovery alternatives in metropolitan areas.

Hint Answer

4. In order to prevent clogging what should be provided prior to tube settlers?

Clarifiers Coarse screen Fine screen Grit chamber

Fine screen

Fine screens are placed before a tube settler. This is done in order to prevent clogging. Tube settlers are placed at an angle of 45-60 degree.

Hint Answer

5. Nitrification efficiency is significantly suppressed as temperature is _____

Increased Decreased Neutral Maintained

Decreased

Two important considerations in nitrification are maintenance of a proper pH and temperature. Nitrification is a very temperature-sensitive system and efficiency is significantly suppressed as temperature decreases.

Hint Answer

6. What is concentration of polymer added to a belt filter press handling primary sludge?

2-5 kg/Mg dry solids 1-4 kg/Mg dry solids 5-10 kg/Mg dry solids 10-12 kg/Mg dry solids

1-4 kg/Mg dry solids

1-4 kg/Mg dry solids is concentration of polymer that is added to belt filter press handling primary sludge. In case of centrifuge concentration would be 1-2.5 kg/Mg dry solids. Polymer doses will vary according to molecular weight and ionic strength.

Hint Answer

7. How are colour and odour removed?

Adsorption Sedimentation Filtration Coagulation

Adsorption

Odour and colour present in water and waste water are removed by aeration and adsorption process. The odour and colour causing elements are adsorbed and aerated that water is free from impurities for use and wastewater for reuse and recycling.

Hint Answer

8. Reverse Osmosis is which type of treatment?

Primary treatment Preliminary treatment Secondary treatment Tertiary treatment

Tertiary treatment

Reverse Osmosis is classified as tertiary treatment. This is mainly used to remove ions. This results in reduction of total dissolved salts.

Hint Answer

9. Sludge treatment helps is reducing treatment costs.

True False

True

Reducing sludge weight and volume to reduce disposal costs is aim of sludge treatment. The choice of a sludge treatment method depends on volume of sludge generated, and comparison of treatment costs required for available disposal options.

Hint Answer

10. Out of below given methods in which of se does sludge contain 70-80% moisture?

Sludge drying bed Filter press Centrifuge Sludge lagoons

Centrifuge

In a centrifuge sludge cake produced contains approximately 70-80 % water. The solid concentration varies from 10-30 %. The centrate contains very low TSS.

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 BOD-Removal-Methods- consists of the following topics

Unit Operations for Wastewater Treatment

The diameter of impeller is usually 1/3 rd of vessel diameter.

Which type of reactor is not subjected to back mixing?

Which of following methods are used in rural communities?

In order to prevent clogging what should be provided prior to tube settlers?

Nitrification efficiency is significantly suppressed as temperature is _____

What is concentration of polymer added to a belt filter press handling primary sludge?

How are colour and odour removed?

Reverse Osmosis is which type of treatment?

Sludge treatment helps is reducing treatment costs.

Out of below given methods in which of se does sludge contain 70-80% moisture?

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