Georgia Onsite Septic Section D Exam
Questions and Answers
What does bacterial action does septic tanks rely on for treatment? - Answer-Anaerobic
What introduces atmospheric air into the sewage to promote treatment by aerobic bacteria? - Answer-
Aerobic Treatment Units (ATU's)
What provides treatment through anaerobic and aerobic bacterial action and/or mechanical filtering,
ozonation, or ultraviolet irradiation? - Answer-Combination Units
What is the primary purpose of the septic tank? - Answer-To remove solids suspended in the
wastewater
What is sludge? - Answer-accumulated solids
How long do sludge and scum collect in the septic tank without disturbing the sedimentation function? -
Answer-A few years (3-5years)
What four effects does digestion have on septic tank performance? - 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
Questions and Answers
What does bacterial action does septic tanks rely on for treatment? - Answer-Anaerobic
What introduces atmospheric air into the sewage to promote treatment by aerobic bacteria? - Answer-
Aerobic Treatment Units (ATU's)
What provides treatment through anaerobic and aerobic bacterial action and/or mechanical filtering,
ozonation, or ultraviolet irradiation? - Answer-Combination Units
What is the primary purpose of the septic tank? - Answer-To remove solids suspended in the
wastewater
What is sludge? - Answer-accumulated solids
How long do sludge and scum collect in the septic tank without disturbing the sedimentation function? -
Answer-A few years (3-5years)
What four effects does digestion have on septic tank performance? - 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
