Multiple choice

How is water from the activated sludge removed?

  1. By skimmers

  2. By aerator

  3. By sand drying beds

  4. By sand removed tank
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is removed from activated sludge using sand drying beds, where the sludge is spread and allowed to dry through evaporation and percolation. This method effectively reduces water content through natural processes. Skimmers remove floating materials, aerators add oxygen, and sand removal tanks are earlier in the treatment process.

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