Texas Wastewater Class B Practice Exam

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What is a typical settling time for good quality sludge in an activated sludge plant?

5 to 10 minutes
10 to 15 minutes
15 to 20 minutes
20 to 30 minutes

The correct answer is: 15 to 20 minutes

A typical settling time for good quality sludge in an activated sludge plant is around 15 to 20 minutes. This duration allows for effective sedimentation of the biological solids, enabling the heavier particles to settle to the bottom of the clarifier, forming a sludge layer that can then be removed for further processing or disposal. This timeframe is important because it strikes a balance between allowing enough time for the solids to settle while also maintaining efficiency in the overall wastewater treatment process. Shorter settling times may result in incomplete separation, while longer times can lead to inefficiencies and delays in the treatment cycle. In activated sludge systems, achieving optimal settling times is crucial for maintaining proper system performance, ensuring that the effluent is of high quality, and preventing issues such as bulking or scum formation. Therefore, the choice indicating 15 to 20 minutes reflects a standard practice in the industry.