What is the detention time (DT) for a primary clarifier?

Prepare for the Kentucky Wastewater Treatment Operator Certification Exam. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam today!

Multiple Choice

What is the detention time (DT) for a primary clarifier?

Explanation:
Detention time is the average time wastewater spends in a tank, calculated from the tank volume divided by the influent flow. A primary clarifier is sized to give enough time for gravity settling of the settled solids, typically about 1.5 to 2 hours at design flow. Shorter times wouldn’t allow adequate settling, while much longer times would cause operational problems and odor issues.

Detention time is the average time wastewater spends in a tank, calculated from the tank volume divided by the influent flow. A primary clarifier is sized to give enough time for gravity settling of the settled solids, typically about 1.5 to 2 hours at design flow. Shorter times wouldn’t allow adequate settling, while much longer times would cause operational problems and odor issues.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy