Originally Aired - Monday, February 17 • 4:30 PM - 5:30 PM
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Location: Rm133
A settling tank serves multiple functions in an onsite wastewater treatment system. The tank accepts liquid from the facility, collects solids that settle from the flowing liquid, serves as a treatment tank, and retains settled and digested solids. A settling tank uses gravity to facilitate heavy solids settling and lighter solids floating to develop three layers in the tank: sludge, scum and clarified liquid. The outlet baffle draws liquid from the clarified layer and restricts floating scum from exiting the tank. An effluent screen serves to retain suspended solids in the tank. Access risers facilitate inspection and maintenance activities, such as pumping stored solids. Tank sizing determines the storage volume for sludge and subsequently the solids removal frequency. Tank troubleshooting evaluates the tank condition and verifies components are present to control liquid flow, retain solids, and facilitate air venting as water enters and exits the tank. The settling tank is typically the first tank in the treatment train. The tank retains the suspended solids and trash that can disrupt the downstream treatment processes. A functional settling tank is critical to long-term performance of an onsite wastewater treatment system.
After this session, attendees will be able to:
1. Measure the sludge, scum and clarified layers in settling tank and identify if the tank pumping is needed.
2. Evaluate the baffles and effluent screen in a tank.
3. Describe the conditions indicating the tank is in an unacceptable condition resulting in the need for replacement.
4. Identify how air and water exchanges in a tank.
Ideal Audience: Designers, operators, and installers.
Level: Basic
Type: 60-Minute Education Session
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