Discussion
What type of micro-organisms are found useful in activated sludge process ?
Answer: C
Activated sludge depends on chemoheterotrophs.
The activated sludge process uses an aerated mass of microbes to oxidise the organic matter in sewage. The dominant bacteria, such as Zoogloea and Pseudomonas, obtain both energy and carbon from organic compounds by chemical oxidation, which makes them chemoheterotrophs.
Chemoautotrophs, such as nitrifying bacteria, are present but take carbon from CO2 and play a smaller part. Photoautotrophs and photoheterotrophs need light, which is scarce in the turbid aeration tank.
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