Microbes in Waste Treatment

Q. Which of the following gas(es) are included in biogas?

1. Methane
2. Oxygen
3. Hydrogen
4. Carbon dioxide

Q.

How do you dispose of human faeces?

Q. is the amount of dissolved oxygen needed by organisms present in water bodies to digest the organic nutrients present in it.

1. COD
2. LOD
3. BOD
4. MOD

Q. Why is the liquid effluent from the primary sewage treatment step passed on for secondary treatment?

1. To kill all the microbes
2. To digest all the nutrients using microbes
3. To filter out the toxic waste
4. To remove organic solvents from it

Q. The waste sludge formed in biogas plants can be used as a biofertilizer.

1. False
2. True

Q. Secondary sewage treatment in a sewage treatment plant is mainly a process.

1. mechanical
2. chemical
3. physical
4. biological

Q. Label the different parts and components of a biogas plant.

1. Digester
2. Biogas
3. Waste
4. Sludge