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Consider the following statements regarding activated sludge process:

1. Industries prefer activated sludge process as it requires less space, does not produce obnoxious odours and requires less time for waste water treatment compared to trickling filter.

2. It requires skilled supervision

3. Biological treatment is enhanced because shock loadings are eliminated.

Which of the above statements are correct?


1. 1 and 2 only
2. 1 and 3 only
3. 2 and 3 only 
4. 1, 2 and 3

1 Answer

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Best answer
Correct Answer - Option 1 : 1 and 2 only

Biological wastewater treatment: The biological process of sewage is a secondary treatment involving removing, stabilizing, and rendering harmless very fine suspended matter, and solids of the wastewater that remain even after the primary treatment has been done.

The major process of secondary or biological treatment are:

  • Activated Sludge Process
  • Trickling Filters

 

Activated sludge process:

  • The essential features of activated sludge process are an aeration stage, solids- liquid separation following aeration, and a sludge recycle system.
  • Wastewater after primary treatment enters an aeration tank where the organic matter is brought into intimate contact with the sludge from the secondary clarifier.
  • It requires less space, does not produce obnoxious odours and requires less time for wastewater treatment.
  • It requires skilled supervision

 

Trickling filters:

  • The secondly commonly used biological waste treatment process is the trick­ling filter method. Trickling filters are also called percolating filters.
  • It has good adaptability to handle peak shock loads and the ability to function satisfactorily after a short period of time.

 

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