Multiple choice

What is water trickling?

Water pollution can be defined as an undesirable change in the physical, chemical and biological characteristics of water that will be harmful to humans, animals or plant life and productivity. It is customary to consider the treatment of polluted water in three phases- Primary treatment, Secondary treatment and Tertiary or advanced treatment.

  1. In this method, the waste water is mechanically stirred in a tank in presence of increased oxygen with help of electronic pump.

  2. It is carried out by a biological system where microorganisms decompose organic matter.

  3. In this method, different chemical components like phosphate, nitrogen, ammonia, poly-electrolytes, etc. are removed in treatment plants.

  4. In this process, the waste water is passed over stones or racks of plastic surface.

  5. In this process, waste water is passed through a series of wire-meshes of decreasing size.
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D Correct answer
Explanation

Trickling of water does the process of passing waste water over stones or racks of plastic surface by gravity that creates an aerated surface resemble the rapid in the natural stream. In presence of oxygen, bacteria degrade organic matter and role of detritus feeding invertebrates in such microbial digestive system is a great importance.

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