Practice Quiz

Civil Engineering PE

Category - Wastewater

Start a Study Session Sign up for Question of the Day
In a typical municipal wastewater treatment plant, what is the normal retention time range for primary sludge in a gravity thickener, depending on temperature?
  1. Less than 1 day
  2. 1 to 2 days
  3. 2 to 3 days
  4. More than 3 days
Explanation
Answer: B - In a typical municipal treatment plant, the gravity thickener retention time normally ranges between 1 to 2 days for primary sludge. The exact retention time depends on the temperature of the sludge. The most common configuration for a gravity sludge thickener is a circular tank with a side water of 10 to 14 feet (3 to 4 m) and a designed detention period of 24 hours.
Was this helpful? Upvote!
Login to contribute your own answer or details
Start a Study Session Sign up for Question of the Day

Top questions

Related questions

Most popular on PracticeQuiz