Multiple choice

In a sewage treatment plant, the activated sludge process is a vital biological process. Which among the following statements regarding the activated sludge process is incorrect?

  1. The process develops a biological floc.

  2. The combination of wastewater and biological mass is commonly known as mixed liquor.

  3. Mucilaginous filamentous bacteria develops in poorly managed activated sludge.

  4. The brown floc is mainly composed of symbiotic bacteria.

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The material, which in healthy sludge is a brown floc, is largely composed of saprotrophic bacteria but also has an important protozoan flora mainly composed of amoebae, spirotrichs, peritrichs including vorticellids and a range of other filter feeding species.

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