which of the following should be done to reduce water pollution
Answers
- The Constitution of India is the supreme law of India. It imparts constitutional supremacy and not parliamentary supremacy, as it is not created by the Parliament but, by a constituent assembly, and adopted by its people, with a declaration in its preamble. ... Parliament cannot override it.
Answer:
The correct option is (c)Treating sewage before discharge into water bodies.
Explanation:
Sewage primarily consists of human excreta and is rich in harmful bacteria and organic debris. Therefore, it is essential that waste be made less filthy before being released into water bodies.
The following phases are used to explain the sewage treatment process:
a) Primary treatment: To remove both large and tiny particles, the filtration and sedimentation processes are used in this treatment. By putting it through mesh wire screens during the filtering process, floating debris is removed. The soil and tiny pebbles are then removed by sedimentation. The supernatant is referred to as primary effluent, while the sediment is referred to as primary sludge. The secondary treatment is then where the wastewater goes.
b) Secondary treatment: In this process, a continuous flow of air is used to stir up enormous aeration tanks that contain primary effluent. Thus, the biological oxygen demand (BOD) of the effluent is reduced as aerobic bacteria develop rapidly and consume a significant portion of the organic effluent. After entering the settling tank, where bacterial flocs settled, the sewage was transformed into activated sludge. The remaining activated sludge is introduced into huge tanks known as anaerobic sludge digesters, while a portion is again fed into an aeration tank to act as an inoculum. Here, anaerobic bacteria multiply and create biogas, which is a mixture of gases including methane, hydrogen sulfide, and carbon dioxide. Then, this effluent can be discharged into open bodies of water.
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