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 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.
Explain the different steps involved during primary treatment phase of sewage.
The primary phase of sewage treatment involves physical removal of particles by filtration and sedimentation.
Different steps involved during the primary treatment are as follows:
i. Initially, floating debris of sewage water is removed by sequential filtration.
ii. Then, grit (soil and small pebbles) are removed by sedimentation.
Effluent (that is the supernatant formed when all the solids settle from the primary sludge) is then taken for secondary treatment.Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they called so?
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