Advertisements
Advertisements
Question
List the events that lead to biogas production from waste water whose BOD has been reduced significantly.
Solution
Once the biological oxygen demand (BOD) of waste water is significantly reduced, the effluent is passed into a settling tank for sedimentation. From the settling tank, the sedimented material, called activated sludge, is transferred into another large tank called anaerobic sludge digester. In the anaerobic sludge digester, anaerobic bacteria grow and digest the rest of the organic matter and the flocs present in the sludge to produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases are collectively known as biogas.
APPEARS IN
RELATED QUESTIONS
State the cause of accelerated eutrophication
Why is Eichhornia crassipes nicknamed as “Terror of Bengal”?
Name the two different categories of microbes naturally occurring in sewage water.
Write critical notes on Eutrophication
The expanded form of DDT is ______.
The green scum seen in the fresh water bodies is ______.
The loudness of a sound that a person can withstand without discomfort is about ______.
Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of ______.
Match the following and choose the correct option.
| Column I | Column II |
| A. Environment Protection Act | i. 1974 |
| B. Air Prevention & Control of Pollution Act | ii. 1987 |
| C. Water Act | iii. 1986 |
| D. Amendment of Air Act to include noise as an air pollutant The correct matches is | iv. 1981 |
Match the following and choose the correct option.
| Column I | Column II |
| A. Environment Protection Act | i. 1974 |
| B. Air Prevention & Control of Pollution Act | ii. 1987 |
| C. Water Act | iii. 1986 |
| D. Amendment of Air Act to include noise as an air pollutant | iv. 1981 |
The correct matches is:
