Sewage purification by
(a) microbes (b) fertilizers
(c) antibiotics (d) plants
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B) Fertilizers is the correct answer
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Sewage purification by microbes.
* Sewage is the presence of huge amounts of organic matter in the waste water generated. Hence, this can be treated using microbes.
* There are sewage treatment plants that utilize heterotrophic microbes to get rid of the organic matter.
* Sewage treatment has two steps:
1. Primary - the removal of small are large particles from water by physical means.
The effluent from primary treatment goes for secondary treatment.
2. Secondary- Effluent is passed to large aeration tanks where bacteria form flocs along with fungus which finally helps in reducing the biological oxygen demand ( BOD).
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