Short Answer TypeName the two different categories of microbes naturally occurring in sewage water. Explain their role in cleaning sewage water into usable water.
Study the graph given below. Explain how oxygen concentration is affected in the river when sewage is discharged into it.
The introduction of sewage caused a sudden and sharp drop in the amount of dissolved oxygen in the river. This is caused due to an increase in the biological oxygen demand (BOD). This in turn leads to the death of fishes and other aquatic life. As the sewage gets diluted due the flow of the water, the river slowly regains some of its oxygen concentration.
The diagram above is that of a typical biogas plant. Explain the seQ uence of events occurring in a biogas plant. Identify a, b and c.
Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they called so?
Switch
