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Question

A trickling filter is used in which of the following wastewater treatment processes


A

Primary treatment

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B

Secondary aerobic treatment

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C

Secondary anaerobic treatment

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D

Tertiary treatment

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E

All of the above

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Solution

The correct option is B

Secondary aerobic treatment


The correct option is option B.

Explanation of the correct option:

  1. Wastewater treatment is the process of removing impurities from wastewater and converting it into an effluent that may be recycled into the water cycle.
  2. Wastewater treatment is the process of restoring water that has been utilised and/or polluted by people or nature to an acceptable state.
  3. Trickling filters are used in secondary wastewater treatment to aerobically remove pollutants by microorganisms.
  4. It employs an attached growth method in which a bed of rocks, gravel, coke, slag, peat moss, and plastic is created through which garbage is flown and microorganisms are attached to the bed's surface.
  5. Natural air flowing through the bed or forced air diffusion makes the entire system aerobic.
  6. The wastewater trickles through the porous bed and organic material is gathered on it, thus the term trickling filter.

Explanation of the incorrect options:

Option A:

  1. Primary waste treatment is physically removing big and tiny particles by filtering and sedimentation.
  2. Floating debris is removed first by sequential filtering, followed by sedimentation to remove grit (soil and tiny stones).

Option C:

  1. In the absence of oxygen, bacteria break down organic pollutants in anaerobic wastewater treatment.
  2. Water enters a bioreactor receptacle in a typical anaerobic treatment cycle.

Option D:

  1. Tertiary treatment in wastewater is the third and last advanced treatment procedure used in a wastewater plant to disinfect water that has already been treated by primary and secondary processes for eliminating dangerous material.
  2. This results in high-quality, potable water.

Final Answer: A trickling filter is used in secondary wastewater treatment processes.


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