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प्रश्न
Explain the role of microbes in cleaning sewage water into usable water.
उत्तर
The bacteria along with the fungal mycelia form flocs. These flocs are utilised during the secondary treatment of sewage. The primary effluent after separation of the grit and debris is taken to the secondary treatment. Here, the effluent is passed to an aeration tank where it is constantly agitated and air is pumped into it. This leads to vigorous growth of bacteria and floc formation, the bacteria in these flocs consume of organic matter; thus decreasing the BOD of the sewage.
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संबंधित प्रश्न
List the events that reduce the Biochemical Oxygen Demand (BOD) of a primary effluent during sewage treatment.
"Determination of Biological Oxygen Demand (BOD) can help in suggesting the quality of a water body." Explain.
Write critical notes Biological magnification
Answer the following question:
While on a visit to a pond in the city-neighborhood, the visitors were delighted to find a large expanse of water covered with colorful algal mass.
Explain the cause of such algal growth.
The expanded form of DDT is ______.
The loudness of a sound that a person can withstand without discomfort is about ______.
Which one of the following diseases is not caused due to contamination of water?
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 |
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 |
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 |
