2025 With 100% Correct Answers
What does bacterial action does septic tanks rely on for treatment? - CORRECT
ANSWER✔✔Anaerobic
What introduces atmospheric air into the sewage to promote treatment by aerobic bacteria? -
CORRECT ANSWER✔✔Aerobic Treatment Units (ATU's)
What provides treatment through anaerobic and aerobic bacterial action and/or mechanical
filtering, ozonation, or ultraviolet irradiation? - CORRECT ANSWER✔✔Combination Units
What is the primary purpose of the septic tank? - CORRECT ANSWER✔✔To remove solids
suspended in the wastewater
What is sludge? - CORRECT ANSWER✔✔accumulated solids
How long do sludge and scum collect in the septic tank without disturbing the sedimentation
function? - CORRECT ANSWER✔✔A few years (3-5years)
What four effects does digestion have on septic tank performance? - CORRECT ANSWER✔✔1.
The sludge volume can be reduced by 40% which reduces the septage pumping frequency
2. The rising gas bubbles from the sludge blanket may carry active organisms, seeding the clear
liquid space of the tank to speed decompositions of the solids which remain suspended in the
liquid
3. The rising bubbles may interfere with effective settling and, thereby, carry suspended solids
out of the tank