Texas Wastewater Class B Practice Exam

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What is the proper settling quality of good sludge in an activated sludge plant?

Gently and Uniformly over 5 minutes
Gently and Uniformly over 15 to 20 minutes
Rapidly and Ragged over 5 minutes
Rapidly and Ragged over 15 to 20 minutes

The correct answer is: Gently and Uniformly over 15 to 20 minutes

The proper settling quality of good sludge in an activated sludge plant is characterized by a gentle and uniform settling over a duration of 15 to 20 minutes. This indicates that the sludge particles are of an appropriate size and density, allowing them to interact effectively with the water during the settling process. Such conditions promote the formation of flocs that are compact and can settle nicely, leading to clearer effluent and a higher quality of treated water. A gentle and uniform settling process helps to prevent disturbances in the sludge blanket, ensuring that there is minimal resuspension of solids. The duration of 15 to 20 minutes reflects a well-functioning activated sludge system where the conditions are optimal for biological treatment and sedimentation. Good settling characteristics are essential for efficient operation and maintenance of the treatment plant, allowing for effective separation of solids from the liquid phase and ensuring regulatory compliance for effluent discharge.